CN110504410A - Lithium ion battery and pole piece thereof - Google Patents
Lithium ion battery and pole piece thereof Download PDFInfo
- Publication number
- CN110504410A CN110504410A CN201810478712.2A CN201810478712A CN110504410A CN 110504410 A CN110504410 A CN 110504410A CN 201810478712 A CN201810478712 A CN 201810478712A CN 110504410 A CN110504410 A CN 110504410A
- Authority
- CN
- China
- Prior art keywords
- material layer
- active material
- diaphragm
- lithium
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a lithium ion battery and a pole piece thereof, wherein the pole piece comprises a current collector and a diaphragm formed on the current collector, the diaphragm comprises active material layers, the active material layers comprise a first active material layer and a second active material layer which are positioned at two sides, and a third active material layer which is positioned in the middle, the particle size of the materials in the first active material layer and the second active material layer is smaller than that of the materials in the third active material layer, the first active material layer accounts for 1/5-3/8 of the width of the diaphragm, the second active material layer accounts for 1/5-3/8 of the width of the diaphragm, and the third active material layer accounts for 1/4-3/5 of the width of the diaphragm. Compared with the prior art, the lithium ion battery and the pole piece thereof have the advantages of strong liquid absorption capacity, high liquid absorption rate, high thermal stability and good cycle performance.
Description
Technical field
The invention belongs to field of batteries, it is more particularly related to a kind of lithium ion battery and its pole piece.
Background technique
Imbibition ability is the important parameter for influencing performance of lithium ion battery, and the imbibition ability of battery is mainly by pole piece center
The imbibition ability in domain limits.Currently, solving the common method of imbibition ability mainly include the following types: 1) by taking out in the fluid injection stage
Vacuum simultaneously combines pressurization auxiliary electrolyte to absorb, and electrolyte is promoted to enter in the duct between particle；2) quiescence in high temperature auxiliary electricity
Liquid infiltration is solved, quiescence in high temperature is for a period of time, lower due to being electrolysed fluid viscosity at high temperature, and electrolyte infiltration can be made between pole piece
In gap；3) a certain amount of electrolyte is first injected in multiple fluid injection, makes its absorption, then injects more electrolyte by several times again, until specified
Amount.Although the above method can make electrolyte easily infiltrate pole piece edge, and gradually permeate to pole piece center, in
Between, the path of electrolyte permeability is longer, is more difficult to sufficiently infiltrate, and when infiltrating pole piece intermediate region sufficiently, need to expend too long
Time, be not able to satisfy the needs that battery is quickly prepared.
In view of this, it is necessory to provide, a kind of imbibition ability is strong, rate of liquid aspiration is fast, thermal stability is high and good cycle
Lithium ion battery and its pole piece.
Summary of the invention
Goal of the invention of the invention is: overcoming the deficiencies of the prior art and provide that a kind of imbibition ability is strong, rate of liquid aspiration
Fastly, the lithium ion battery and its pole piece of thermal stability height and good cycle.
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of electrodes of lithium-ion batteries, including collector and formation
In the diaphragm on collector, the diaphragm includes active material layer, and the active material layer includes the first activity positioned at both sides
Material layer and the second active material layer, and it is located in the middle third active material layer, first active material layer and second
The partial size of material is less than the partial size of material in third active material layer in the active bed of material, and it is wide that first active material layer accounts for diaphragm
The 1/5~3/8 of degree, second active material layer accounts for the 1/5~3/8 of diaphragm width, and the third active material layer accounts for diaphragm
The 1/4~3/5 of width.
When the first active material layer and the second active material layer account for diaphragm width it is very little when, in intermediate third active material layer
The biggish material of partial size is excessive, and battery high rate during charging-discharging is difficult to ensure；When the first active material layer and the second active material
The bed of material account for diaphragm width it is too big when, since the partial size of material in the first active material layer and the second active material layer is smaller, width
Too big, the liquid absorption amount of the larger material of partial size is less in intermediate third active material layer, and thermal stability is poor, influences battery and follows for a long time
Ring stability.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, first active material layer accounts for the 1/4 of diaphragm width
~1/3, second active material layer accounts for the 1/4~1/3 of diaphragm width, and the third active material layer accounts for the 1/ of diaphragm width
3~1/2.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, first active material layer accounts for the 1/4 of diaphragm width,
Second active material layer accounts for the 1/4 of diaphragm width, and the third active material layer accounts for the 1/2 of diaphragm width.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, first active material layer accounts for the 1/3 of diaphragm width,
Second active material layer accounts for the 1/3 of diaphragm width, and the third active material layer accounts for the 1/3 of diaphragm width.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the partial size of material and institute in the third active material layer
The D50 difference of the partial size of material in the first active material layer and the second active material layer is stated 20% or more.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the electrodes of lithium-ion batteries with a thickness of 20 μm~
200 μm, preferably 55 μm~160 μm, more preferably 80 μm~140 μm.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, first active material layer, the second active material layer
It is rectangle, square or parallelogram sturcutre with third active material layer.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the diaphragm further includes conductive layer or function material layer,
The thickness of the conductive layer is no more than 10 μm, and preferably 0.5 μm~5 μm, the thickness of the function material layer is excellent no more than 10 μm
It is selected as 0.5 μm~5 μm.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the diaphragm further includes conductive layer and function material layer,
The conductive layer is formed in the collection liquid surface, and the function material layer is formed in the surface of the conductive layer；Or
The function material layer is formed in the collection liquid surface, and the conductive layer is formed in the table of the function material layer
Face, the thickness of the conductive layer are no more than 10 μm, and preferably 0.5 μm~5 μm, the thickness of the function material layer is no more than 10 μ
M, preferably 0.5 μm~5 μm,.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the conductive layer includes conductive agent, the conductive agent choosing
At least one of self-conductance electrical carbon, electrically conductive graphite, electrically conductive ink, Ketjen black, carbon nanotube, conductive Carbon fibe, acetylene carbon black；Institute
Stating function material layer is one of inorganic coating, organic/inorganic composite coating, organic coating.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, the conductive layer further includes binder, the binder
Selected from least one of Kynoar, polyvinyl alcohol, polytetrafluoroethylene (PTFE) and sodium carboxymethylcellulose, the conductive agent and institute
The mass ratio for stating binder is 92~98:2~8, preferably 94~96:4~6.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, in the organic coating and organic/inorganic composite coating
Organic principle be selected from have lead one or more of polymer, high-melting-point polymer, flame-retardant polymer of lithium ion ability；
Inorganic constituents in the inorganic coating and organic/inorganic composite coating is selected from aluminum oxide, aluminum oxyhydroxide, titanium dioxide
Silicon, titanium dioxide, ceria, calcium carbonate, calcium oxide, zinc oxide, magnesia, Cerium titanate, calcium titanate, barium titanate, lithium phosphate,
At least one of titanium phosphate lithium, titanium phosphate aluminium lithium, lithium nitride, lanthanium titanate lithium.
As a kind of improvement of electrodes of lithium-ion batteries of the present invention, in the organic coating and organic/inorganic composite coating
Organic principle be selected from Kynoar, vinylidene fluoride-hexafluoropropylene copolymer, acrylonitrile-butadiene-styrene copolymer,
Polyacrylonitrile, polyethyl acrylate, acrylic-styrene copolymer, acrylonitrile-butadiene copolymer, it is poly- between phenyl-diformyl
One or more of phenylenediamine, polyimides, poly(p-phenylene terephthalamide), polymethyl acrylate.
To achieve the goals above, the present invention also provides a kind of lithium ion batteries, including cathode sheets, anode strip, interval
Isolation film and electrolyte between cathode sheets and anode strip, the cathode sheets and anode strip are at least a kind of for above-mentioned institute
The electrodes of lithium-ion batteries stated.
As a kind of improvement of lithium ion battery of the present invention, the cathode sheets are electrodes of lithium-ion batteries described above.
As a kind of improvement of lithium ion battery of the present invention, the cathode sheets include collector and are formed on collector
Diaphragm, the diaphragm include active material layer, and the active material layer includes the first active material layer and second positioned at both sides
Active material layer, and it is located in the middle third active material layer, first active material layer, the second active material layer,
Material in three active material layers is selected from cobalt acid lithium compound, nickle cobalt lithium manganate compound, nickel cobalt aluminic acid lithium compound, ferric phosphate
One or more of lithium compound, mangaic acid lithium compound, lithium ferric manganese phosphate compound, nickel ion doped compound.
Compared with the existing technology, lithium ion battery and its pole piece of the present invention have following technical effect that
1) by being coated with the lesser active material of partial size in pole piece areas at both sides, the biggish work of partial size is coated in intermediate region
Property material, since gap is larger between bulky grain, duct is more, can promote pole piece electrolyte wet-out rate, is conducive to battery
Quick imbibition；
2) feature low for both sides high among battery temperature, by being coated with the biggish active material of partial size in intermediate region
Material, since large particulate matter specific surface area is lower, side reaction is less, is conducive to the long-term cycle performance of battery；
3) thermal stability and long-time stability for improving pole piece improve the manufacture efficiency and security performance of battery.
Detailed description of the invention
Fig. 1 is the transverse cross-sectional view of electrodes of lithium-ion batteries of the present invention.
The first active material layer of 10-；The second active material layer of 20-；30- third active material layer
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and its technical effect, below in conjunction with attached drawing and tool
Body embodiment, the present invention will be described in further detail.It should be understood that specific embodiment party described in this specification
Formula is not intended to limit the present invention just for the sake of explaining the present invention.
Refering to Figure 1, electrodes of lithium-ion batteries of the present invention includes collector and the diaphragm that is formed on collector, film
Piece includes active material layer, and active material layer includes the first active material layer 10 and the second active material layer 20 positioned at both sides,
And it is located in the middle third active material layer 30, the partial size of material is small in the first active material layer 10 and the second active bed of material 20
The partial size of material in third active material layer 30, the first active material layer 10 account for the 1/5~3/8 of diaphragm width, the second activity
Material layer 20 accounts for the 1/5~3/8 of diaphragm width, and third active material layer 30 accounts for the 1/4~3/5 of diaphragm width.
Embodiment 1
Cathode sheets preparation
It 1) is in mass ratio that 97:2:1 addition is molten by active material of cathode NCM111 (D50 is 5.2 μm), conductive agent, PVDF
Agent N-Methyl pyrrolidone (NMP) stirs evenly acquisition cathode slurry under de-airing mixer effect, cathode slurry is uniformly applied
The one side for overlaying on aluminium foil obtains the first cathode material layer；2) by active material of cathode NCM111 (D50 be 8.6 μm), conductive agent,
PVDF is that solvent N-methyl pyrilidone (NMP) is added in 97:2:1 in mass ratio, stirs evenly and obtains under de-airing mixer effect
Cathode slurry is obtained, the middle position that cathode slurry is coated uniformly on aluminium foil is obtained into third cathode material layer；3) by cathode activity
Material NCM111 (D50 is 5.2 μm), conductive agent, PVDF are that solvent N-methyl pyrilidone is added in 97:2:1 in mass ratio
(NMP), acquisition cathode slurry is stirred evenly under de-airing mixer effect；Cathode slurry is coated uniformly on the another of aluminium foil
Side obtains the second cathode material layer；4) aluminium foil is transferred to 90 DEG C of oven drying 1h after room temperature is dried, then by cold pressing,
Cutting obtains the cathode sheets with zebra applying structure.Wherein, the first cathode material layer, the second cathode material layer and third cathode
Material layer respectively accounts for the 1/3 of diaphragm width, and is coated in the two sides of collector (aluminium foil), and the first cathode active material, second
Cathode active material and third cathode active material are rectangular configuration.
Anode strip preparation
By active material of positive electrode graphite FSNC, thickener sodium carboxymethylcellulose (CMC), binder butadiene-styrene rubber (SBR),
Conductive agent is mixed according to weight ratio 95.5:1.2:1.8:1.5, and solvent deionized water is added, under de-airing mixer effect
Stir evenly acquisition anode slurry；Anode slurry is coated uniformly on copper foil；Copper foil is transferred to 120 DEG C after room temperature is dried
Then oven drying 1h obtains anode strip by cold pressing, cutting.
Electrolyte preparation
In water content < 10ppm argon atmosphere glove box, by sufficiently dry lithium salts LiPF6It is dissolved in organic solvent
In, it is uniformly mixed, obtains electrolyte.Wherein, LiPF6Concentration be 1M.Wherein organic solvent is ethylene carbonate: propylene carbonate
Ester: the mixed solvent of propyl propionate=1:1:1 (volume ratio).
The preparation of lithium ion battery
Cathode sheets, isolation film, anode strip are folded in order, make isolation film be in played between cathode sheets and anode strip every
From effect, then cathode sheets and anode strip are cold-pressed, cuts, 4060D0 soft-package battery is made, and inject electrolyte, by changing
At, aging, vacuum seal, be made lithium ion battery.
Embodiment 2~11 is substantially the same manner as Example 1, the difference is that, each substance relevant parameter is different, design parameter
As shown in table 1.
Embodiment 12~15 and embodiment 1~11 are essentially identical, the difference is that, on the basis of embodiment 1~11
Conductive layer is increased, conductive layer is formed in current collector aluminum foil, and wherein the mass ratio of conductive agent and binder is 94:6.
Embodiment 16~19 and embodiment 1~11 are essentially identical, the difference is that, on the basis of embodiment 1~11
Function material layer is increased, function material layer is formed in current collector aluminum foil.
Embodiment 20 and embodiment 1~11 are essentially identical, the difference is that, on the basis of embodiment 1~11 simultaneously
Conductive layer and function material layer are increased, conductive layer is formed in current collector aluminum foil, and function material layer is formed on conductive layer,
The mass ratio of middle conductive agent and binder is 94:6.
Embodiment 21 and embodiment 1~11 are essentially identical, the difference is that, increase on the basis of embodiment 1~11
Conductive layer and function material layer, function material layer are formed in current collector aluminum foil, and conductive layer is formed in function material layer,
The mass ratio of middle conductive agent and binder is 94:6.
1 related species of Examples 1 to 2 and parameter are as shown in table 1.
Embodiment 22
Cathode sheets preparation
It is in mass ratio that Solvents N-methyl pyrrolidines is added in 97:2:1 by active material of cathode NCM111, conductive agent, PVDF
Ketone (NMP) stirs evenly acquisition cathode slurry under de-airing mixer effect, cathode slurry is coated uniformly on aluminium foil；It will
Aluminium foil is transferred to 90 DEG C of oven drying 1h after room temperature is dried, and then obtains cathode sheets by cold pressing, cutting.
Anode strip preparation
1) by active material of positive electrode graphite C P5H (D50 is 5.5 μm), thickener sodium carboxymethylcellulose (CMC), conductive agent
It is mixed according to weight ratio 95.5:1.2:1.8, solvent deionized water is added, stirred evenly under de-airing mixer effect, most
It is afterwards 1.5 addition binder butadiene-styrene rubber (SBR) stirring to obtain anode slurries according to mass ratio；Anode slurry is coated uniformly on
One side of copper foil obtains first anode material layer；2) by active material of positive electrode graphite C P7H (D50 is 7.8 μm), thickener carboxylic first
Base sodium cellulosate (CMC), binder butadiene-styrene rubber (SBR), conductive agent stir evenly acquisition anode according to ratio as above and method
Slurry；The middle position that anode slurry is coated uniformly on copper foil is obtained into third anode material layer；3) by active material of positive electrode stone
Black CP5H (D50 is 5.5 μm), thickener sodium carboxymethylcellulose (CMC), binder butadiene-styrene rubber (SBR), conductive agent are according to such as
Upper ratio and method stir evenly acquisition anode slurry；Anode slurry is coated uniformly on to the another side of copper foil, obtains the second sun
Pole material layer；4) copper foil is transferred to 120 DEG C of oven drying 1h after room temperature is dried, then obtains anode by cold pressing, cutting.
Wherein, first anode material layer, second plate material layer and third anode material layer respectively account for the 1/3 of diaphragm width, the first anode
Material layer, second plate material layer and third anode material layer are rectangular configuration.
Electrolyte preparation
In water content < 10ppm argon atmosphere glove box, by sufficiently dry lithium salts LiPF6It is dissolved in organic solvent
In, it is uniformly mixed, obtains electrolyte.Wherein, LiPF6Concentration be 1M.Wherein organic solvent is ethylene carbonate: propylene carbonate
Ester: the mixed solvent of propyl propionate=1:1:1 (volume ratio).
The preparation of lithium ion battery
Cathode sheets, isolation film, anode strip are folded in order, make isolation film be in played between cathode sheets and anode strip every
From effect, then cathode sheets and anode strip are cold-pressed, cuts, 4060D0 soft-package battery is made, and inject electrolyte, by changing
At, aging, vacuum seal, be made lithium ion battery.
Embodiment 23~26 is substantially the same manner as Example 22, the difference is that, each substance relevant parameter is different, specific to join
Number is as shown in table 2.
Embodiment 27
27 cathode of embodiment is the cathode of embodiment 1, and anode is the anode of embodiment 22.
Embodiment 28
28 cathode of embodiment is the cathode of embodiment 2, and anode is the anode of embodiment 23.
Embodiment 29
29 cathode of embodiment is the cathode of embodiment 3, and anode is the anode of embodiment 24.
27~29 cathode of embodiment and anode data are as shown in table 3.
1 Examples 1 to 2 of table, 1 related species and parameter
2 embodiment of table, 22~26 related species and parameter
3 embodiment of table, 27~29 cathode and anode
| Cathode | Anode | |
| Embodiment 27 | 1 cathode of embodiment | 22 anode of embodiment |
| Embodiment 28 | 2 cathode of embodiment | 23 anode of embodiment |
| Embodiment 29 | 3 cathode of embodiment | 24 anode of embodiment |
Comparative example 1
It is in mass ratio that solvent is added in 97:2:1 by active material of cathode NCM111 (D50 is 5.2 μm), conductive agent, PVDF
N-Methyl pyrrolidone (NMP) stirs evenly acquisition cathode slurry under de-airing mixer effect, cathode slurry is uniformly coated
On one side of aluminium foil, small particle cathode material layer is obtained；By active material of cathode NCM111 (D50 be 8.6 μm), conductive agent,
PVDF is that solvent N-methyl pyrilidone (NMP) is added in 97:2:1 in mass ratio, stirs evenly and obtains under de-airing mixer effect
Cathode slurry is obtained, cathode slurry is coated uniformly on to the another side of aluminium foil, obtains big partial size cathode material layer；By aluminium foil in room temperature
It is transferred to 90 DEG C of oven drying 1h after drying, is then small particle (D50 is 5.2 μm) cathode on one side by cold pressing, cutting
Material, another side are the cathode sheets of big partial size (D50 is 8.6 μm) cathode material.Wherein, small particle cathode material and big partial size yin
Pole quality of materials ratio is 1:2, and width, thickness are same as Example 1, and is coated in the two sides of current collector aluminum foil.(wherein small particle
Cathode material layer refers to that the lesser material layer of material particle size in same pole piece, big partial size cathode material layer refer to that material particle size is biggish
Material layer is that one kind is compared relationship).
Comparative example 2,3 is essentially identical with comparative example 1, the difference is that the type and partial size of cathode material.
1~3 related species of comparative example and parameter are as shown in table 4.
4 comparative example of table, 1~3 related species and parameter
Performance of lithium ion battery test
Cycle performance test
The lithium ion battery that the lithium ion battery that Examples 1 to 29 is prepared is prepared with comparative example 1~3 is divided equally
It is not tested by the following method:
At a certain temperature, by lithium ion battery with 0.5C constant-current charge to 4.2V, then constant-voltage charge to 0.05C；So
Use 0.5C constant-current discharge to 2.8V afterwards, battery capacity is decayed to the 80% of battery initial capacity, record by such charge/discharge
Cycle-index (15 batteries, take its average value), cycle performance test result is as shown in table 5.
Imbibition test
Naked battery core is suspended on bracket, electronic scale is put in lower section, places container on electronic scale, holds electrolyte.By bracket
It moves downwards, naked battery core is immersed into electrolyte (half that immersion depth is naked battery core height), records the output weight of electronic scale
Amount draws liquid absorption amount-time graph.Liquid absorption amount variation≤0.1g in 600s, that is, think that imbibition terminates after sometime putting, note
Record is the imbibition time.Imbibition test result is as shown in table 5.
5 Examples 1 to 29 of table and 1~3 the performance test results of comparative example
As can be seen from Table 5, compared to comparative example 1~3,1~11 cathode of embodiment uses the cathode of zebra coating process,
The partial size of intermediate material is greater than the partial size of the material on both sides, and anode is common anode, and the rate of liquid aspiration of the naked battery core of gained is bright
Aobvious to accelerate, minimum needs 1250s after imbibition, and the ring service life that gained lithium ion battery follows is presented larger promotion, works as capacity
When decaying to 80%, highest cycle-index be may be up to 2620 times.
Embodiment 12~19 increases conductive layer or function material layer on the basis of embodiment 1~11, and rate of liquid aspiration is bright
Aobvious to accelerate, minimum needs 1180s after imbibition, and when capacity attenuation is to 80%, highest cycle-index be may be up to 2860 times.
Embodiment 20,21 increases conductive layer and function material layer, rate of liquid aspiration simultaneously on the basis of embodiment 1~11
Obvious to accelerate, minimum needs 1190s after imbibition, and when capacity attenuation is to 80%, highest cycle-index be may be up to 2680 times.
22~26 anode of embodiment uses the anode of zebra coating process, and the partial size of intermediate material is greater than the material on both sides
Partial size, cathode is common cathode, and the rate of liquid aspiration of the naked battery core of gained also obviously accelerates, minimum need after imbibition
Larger promotion is presented in 1250s, the ring service life that gained lithium ion battery follows, when capacity attenuation is to 80%, highest cycle-index
Up to 2720 times.
The cathode of embodiment 27 is the cathode of the zebra coating process of embodiment 1, and anode is that the zebra of embodiment 22 is coated with
The anode of technique.At the end of imbibition, the naked battery core imbibition time only needs 1260s, when capacity attenuation is to 80%, lithium ion battery
Cycle-index reaches as high as 2590 times.
The cathode of embodiment 28 is the cathode of the zebra coating process of embodiment 2, and anode is that the zebra of embodiment 23 is coated with
The anode of technique.At the end of imbibition, the naked battery core imbibition time only needs 1240s, when capacity attenuation is to 80%, lithium ion battery
Cycle-index reaches as high as 2670 times.
The cathode of embodiment 29 is the cathode of the zebra coating process of embodiment 3, and anode is that the zebra of embodiment 24 is coated with
The anode of technique.At the end of imbibition, the naked battery core imbibition time only needs 1190s, when capacity attenuation is to 80%, lithium ion battery
Cycle-index reaches as high as 2720 times.
In conclusion this is because at least one pole piece (cathode sheets and/or anode strip) of Examples 1 to 29 uses zebra
Applying structure, centre is by the setting biggish material of partial size, compared to the setting lesser material of partial size, due between big size particle materials
Gap is larger, and duct is more, and specific surface area is lower, improves the rate of liquid aspiration and liquid-keeping property of intermediate region, reduces centre
The side reaction in region, so that the long-term cycle life of battery is obviously improved.
Compared with the existing technology, lithium ion battery and its pole piece of the present invention have following technical effect that
1) by being coated with the lesser active material of partial size in pole piece areas at both sides, the biggish work of partial size is coated in intermediate region
Property material, since gap is larger between bulky grain, duct is more, can promote pole piece electrolyte wet-out rate, is conducive to battery
Quick imbibition；
2) feature low for both sides high among battery temperature, by being coated with the biggish active material of partial size in intermediate region
Material, since large particulate matter specific surface area is lower, side reaction is less, is conducive to the long-term cycle performance of battery；
3) thermal stability and long-time stability for improving pole piece improve the manufacture efficiency and security performance of battery.
According to above-mentioned principle, the present invention can also be made appropriate changes and modifications to the above embodiments.Therefore, this hair
It is bright to be not limited to specific embodiment disclosed and described above, some modifications and changes of the invention should also be as to fall into this
In the scope of protection of the claims of invention.In addition, although being used some specific terms in this specification, these terms
Merely for convenience of description, it does not limit the present invention in any way.
Claims (10)
1. a kind of electrodes of lithium-ion batteries, including collector and the diaphragm being formed on collector, the diaphragm includes active material
The bed of material, which is characterized in that the active material layer includes the first active material layer and the second active material layer positioned at both sides, with
And it is located in the middle third active material layer, the partial size of material is less than the in first active material layer and the second active bed of material
The partial size of material in three active material layers, first active material layer account for the 1/5~3/8 of diaphragm width, second activity
Material layer accounts for the 1/5~3/8 of diaphragm width, and the third active material layer accounts for the 1/4~3/5 of diaphragm width.
2. electrodes of lithium-ion batteries according to claim 1, which is characterized in that it is wide that first active material layer accounts for diaphragm
The 1/4~1/3 of degree, second active material layer accounts for the 1/4~1/3 of diaphragm width, and the third active material layer accounts for diaphragm
The 1/3~1/2 of width.
3. electrodes of lithium-ion batteries according to claim 1, which is characterized in that it is wide that first active material layer accounts for diaphragm
The 1/4 of degree, second active material layer accounts for the 1/4 of diaphragm width, and the third active material layer accounts for the 1/2 of diaphragm width；
Or
First active material layer accounts for the 1/3 of diaphragm width, and second active material layer accounts for the 1/3 of diaphragm width, described
Third active material layer accounts for the 1/3 of diaphragm width.
4. electrodes of lithium-ion batteries according to claim 1, which is characterized in that material in the third active material layer
The D50 difference of the partial size of material is 20% or more in partial size and first active material layer and the second active material layer.
5. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the electrodes of lithium-ion batteries with a thickness of
20 μm~200 μm.
6. electrodes of lithium-ion batteries according to claim 1, which is characterized in that first active material layer, second live
Property material layer and third active material layer be rectangle, square or parallelogram sturcutre.
7. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the diaphragm further includes conductive layer or function
Material layer, the thickness of the conductive layer are no more than 10 μm, and the thickness of the function material layer is no more than 10 μm.
8. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the diaphragm further includes conductive layer and function
Material layer, the conductive layer are formed in the collection liquid surface, and the function material layer is formed in the surface of the conductive layer；Or
The function material layer is formed in the collection liquid surface, and the conductive layer is formed in the surface of the function material layer；
The thickness of the conductive layer is no more than 10 μm, and the thickness of the function material layer is no more than 10 μm.
9. electrodes of lithium-ion batteries according to claim 7 or 8, which is characterized in that the conductive layer includes conductive agent, institute
Conductive agent is stated in conductive carbon, electrically conductive graphite, electrically conductive ink, Ketjen black, carbon nanotube, conductive Carbon fibe, acetylene carbon black
It is at least one；The function material layer is one of inorganic coating, organic/inorganic composite coating, organic coating.
10. a kind of lithium ion battery, including cathode sheets, anode strip, the isolation film being interval between cathode sheets and anode strip, and
Electrolyte, which is characterized in that the cathode sheets and at least a kind of lithium as claimed in any one of claims 1 to 9 of anode strip
Ion battery pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810478712.2A CN110504410B (en) | 2018-05-18 | 2018-05-18 | Lithium ion battery and pole piece thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810478712.2A CN110504410B (en) | 2018-05-18 | 2018-05-18 | Lithium ion battery and pole piece thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110504410A true CN110504410A (en) | 2019-11-26 |
| CN110504410B CN110504410B (en) | 2021-04-02 |
Family
ID=68584071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810478712.2A Active CN110504410B (en) | 2018-05-18 | 2018-05-18 | Lithium ion battery and pole piece thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110504410B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276757A (en) * | 2020-02-19 | 2020-06-12 | 金妍 | Preparation method of power type lithium ion battery |
| CN113130841A (en) * | 2019-12-31 | 2021-07-16 | 荣盛盟固利新能源科技有限公司 | Lithium ion battery pole piece, preparation method thereof and lithium ion battery |
| CN113258031A (en) * | 2020-02-11 | 2021-08-13 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN114597336A (en) * | 2022-03-23 | 2022-06-07 | 珠海冠宇电池股份有限公司 | Negative plate and battery |
| CN117133860A (en) * | 2023-10-27 | 2023-11-28 | 宁德时代新能源科技股份有限公司 | Positive plate, battery monomer, battery and power utilization device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872853A (en) * | 2010-04-21 | 2010-10-27 | 东莞新能源电子科技有限公司 | Polymer lithium ion secondary battery and isolating membrane thereof |
| CN105680019A (en) * | 2016-03-16 | 2016-06-15 | 江苏乐能电池股份有限公司 | Preparation method of high-rate ternary material |
| CN107256971A (en) * | 2017-05-23 | 2017-10-17 | 马鞍山活力电动科技有限公司 | A kind of Soft Roll ternary electrokinetic cell and preparation method thereof |
-
2018
- 2018-05-18 CN CN201810478712.2A patent/CN110504410B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872853A (en) * | 2010-04-21 | 2010-10-27 | 东莞新能源电子科技有限公司 | Polymer lithium ion secondary battery and isolating membrane thereof |
| CN105680019A (en) * | 2016-03-16 | 2016-06-15 | 江苏乐能电池股份有限公司 | Preparation method of high-rate ternary material |
| CN107256971A (en) * | 2017-05-23 | 2017-10-17 | 马鞍山活力电动科技有限公司 | A kind of Soft Roll ternary electrokinetic cell and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113130841A (en) * | 2019-12-31 | 2021-07-16 | 荣盛盟固利新能源科技有限公司 | Lithium ion battery pole piece, preparation method thereof and lithium ion battery |
| CN113258031A (en) * | 2020-02-11 | 2021-08-13 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN113258031B (en) * | 2020-02-11 | 2022-11-18 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN111276757A (en) * | 2020-02-19 | 2020-06-12 | 金妍 | Preparation method of power type lithium ion battery |
| CN114597336A (en) * | 2022-03-23 | 2022-06-07 | 珠海冠宇电池股份有限公司 | Negative plate and battery |
| CN117133860A (en) * | 2023-10-27 | 2023-11-28 | 宁德时代新能源科技股份有限公司 | Positive plate, battery monomer, battery and power utilization device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110504410B (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110504410A (en) | Lithium ion battery and pole piece thereof | |
| CN109004265B (en) | Solid electrolyte positive electrode and solid battery comprising same | |
| CN206878100U (en) | collector and electrochemical energy storage device | |
| CN104008893B (en) | The preparation method of lithium ion hybrid capacitors and lithium ion hybrid capacitors thereof | |
| CN103401016B (en) | Lithium ion battery with high energy density | |
| CN111640940A (en) | Negative plate and secondary battery | |
| CN110364662A (en) | Isolation film and electrochemical appliance | |
| CN110247013B (en) | Positive pole piece and electrochemical device containing same | |
| JP2023531545A (en) | Negative electrode sheet and lithium ion battery | |
| CN111180788B (en) | All-solid-state electrolyte, preparation method thereof and lithium ion battery | |
| CN105762317A (en) | Water-soluble polymer assisted inorganic composite diaphragm preparation method | |
| CN106654125A (en) | Method for preparing modified ceramic diaphragm through dopamine compound adhesive and application thereof | |
| CN107093701A (en) | A kind of thick electrode preparation method and lithium ion battery with excellent electrochemical performance | |
| CN110416467A (en) | Membrane for polymer and its preparation method and application and lithium ion battery and preparation method thereof | |
| CN110247009A (en) | A kind of anti-overcharge diaphragm and preparation method thereof and lithium ion battery | |
| CN111048749B (en) | Negative pole piece, lithium ion battery and manufacturing method thereof | |
| CN110212159A (en) | A kind of composite negative pole pole piece and preparation method thereof | |
| CN110120485A (en) | Membrane for polymer and its preparation method and application and lithium ion battery and preparation method thereof | |
| CN109616604A (en) | A kind of preparation method of macroion conduction battery diaphragm and lithium ion battery containing the diaphragm | |
| CN105513828A (en) | Lithium-ion capacitor composite cathode plate, preparation method thereof and lithium-ion capacitor | |
| CN106972193A (en) | A kind of high magnification fills the preparation method of lithium ion battery soon | |
| WO2020043151A1 (en) | Positive electrode plate, preparation method therefor, and lithium-ion rechargeable battery | |
| CN106571485A (en) | Low temperature manganese-iron-lithium phosphate power battery | |
| CN112670450A (en) | Negative pole piece for solid-state battery and preparation method and application thereof | |
| WO2023197615A1 (en) | Current collector having pore-forming functional coating, electrode sheet, and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |