CN106159201A - A kind of lithium ion battery lithium composite sheet and preparation method thereof, lithium ion battery - Google Patents
A kind of lithium ion battery lithium composite sheet and preparation method thereof, lithium ion battery Download PDFInfo
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- CN106159201A CN106159201A CN201610612920.8A CN201610612920A CN106159201A CN 106159201 A CN106159201 A CN 106159201A CN 201610612920 A CN201610612920 A CN 201610612920A CN 106159201 A CN106159201 A CN 106159201A
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- 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
- H01M4/134—Electrodes based on metals, Si or alloys
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- 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
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- 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
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/381—Alkaline or alkaline earth metals elements
- H01M4/382—Lithium
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- 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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
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- 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 present invention relates to a kind of lithium ion battery lithium composite sheet and preparation method thereof, lithium ion battery, belong to technical field of lithium ion.The lithium ion battery of present invention lithium composite sheet, including lithium sheet, described lithium sheet Surface coating has lithium metaaluminate material layer, described lithium metaaluminate material layer to include lithium metaaluminate.The lithium ion battery lithium composite sheet of the present invention is applied in lithium ion battery, the irreversible lithium that cathode pole piece consumes during initial charge can be supplemented, the Stability Analysis of Structures of pole piece can also be kept in lithium ion battery charge and discharge process, be conducive to improving the cycle life of lithium ion battery.When internal temperature of lithium ion battery rises, battery core also can be preferably kept not occur serious structure to change.
Description
Technical field
The present invention relates to a kind of lithium ion battery lithium composite sheet and preparation method thereof, lithium ion battery, belong to lithium ion
Cell art.
Background technology
It is widely used in the fields such as electric automobile, number, electric tool and energy storage thereof along with lithium ion battery, applies city
The requirement of energy density, cycle life and the security performance thereof of lithium ion battery is also improved constantly by field.
A part of electrolyte can be consumed owing to lithium ion battery cyclic process being formed SEI, after long-term circulation, electricity can be caused
In the electrolyte inside of pond, lithium ion is not enough, affects the transfer rate of its lithium ion, reduces the cycle performance of battery.
In order to make up the loss of this lithium ion, prior art there is employing benefit lithium layer is set at pole piece negative pole and mend lithium to pole piece
Method.Application publication number is that the Chinese invention patent of CN103401016A discloses a kind of lithium ion battery with high energy density,
This lithium ion battery includes that anode pole piece, cathode pole piece, isolating membrane and the positive pole between anode pole piece and isolating membrane are mended
Lithium layer, it is lithium sheet, lithium powder etc. that its positive pole mends lithium layer.Lithium in this lithium ion battery easily remains in electrode surface and forms lithium metal
Granule, causes piercing through barrier film and causing potential safety hazard.In order to avoid metallic particles or the Li dendrite of residual pierce through barrier film, this
Being provided with two layers of polymers conductive layer in bright in benefit lithium layer, one layer is arranged on anode pole piece and mends between lithium layer, being used for slowing down
Mending the lithium layer benefit lithium speed to anode pole piece, another layer is arranged between benefit lithium layer and barrier film, is used for suppressing the metal of residual
Grain, Li dendrite pierce through barrier film, reduce micro-short circuit, reduce potential safety hazard.
In above-mentioned lithium ion battery, use polymeric, conductive layer to slow down benefit lithium speed, and avoid metallic particles or lithium
Dendrite pierces through barrier film, and its polymeric, conductive layer uses polymer, ion conductive material, electronic conductive material to mix, and it makes
The impedance of ion conductive material higher, cause the discharge and recharge reversibility of battery to reduce, and in charge and discharge process and temperature
Structure and change in volume during degree change are the most obvious, are unfavorable for improving the cycle performance of ion battery.
Summary of the invention
It is an object of the invention to provide a kind of lithium ion battery lithium that can improve cycle performance of lithium ion battery to answer
Close sheet.The present invention also aims to the preparation method of above-mentioned lithium ion battery lithium composite sheet is provided and uses this lithium ion
The battery lithium ion battery of lithium composite sheet.
For achieving the above object, the technical scheme of the lithium ion battery lithium composite sheet of the present invention is:
A kind of lithium ion battery lithium composite sheet, including lithium sheet, described lithium sheet Surface coating has lithium metaaluminate material layer.
The lithium ion battery of the present invention at lithium sheet surface configuration lithium metaaluminate material layer, both can guarantee that lithium sheet by lithium composite sheet
Supplementing the irreversible lithium that cathode pole piece consumes during initial charge, the efficiency first and the energy that improve lithium ion battery are close
Degree, can utilize again lithium metaaluminate material to slow down the lithium sheet embedding lithium speed to anode pole piece, also can effectively suppress to mend after lithium residual
The Li dendrite formed in the metallic particles that stays, charge and discharge process pierces through isolating membrane, and then reduces potential safety hazard, reduces lithium-ion electric
The self discharge that pond micro-short circuit causes.The ionic conductivity of lithium metaaluminate material is very strong, has the highest conduction to lithium ion
Ability, it is possible to increase substantially the efficiency of transmission of lithium ion, also there is stronger electron conduction, advantageously reduce the interior of battery
Resistance.Lithium metaaluminate also has higher chemical stability and heat stability, will not produce in lithium ion battery charge and discharge process
Bigger change in volume, additionally it is possible to keep the Stability Analysis of Structures of pole piece in lithium ion battery charge and discharge process, is conducive to improving lithium
The cycle life of ion battery.When internal temperature of lithium ion battery rises, also battery core can be preferably kept not occur serious
Structure changes.It addition, lithium metaaluminate is coated on lithium sheet, when lithium composite sheet uses in lithium ion battery, lithium metaaluminate material
Layer can protect internal lithium sheet not oxidized, it is ensured that mends the persistence of lithium.
Lithium metaaluminate material layer can be arranged on the one side of lithium sheet can also be arranged on two surfaces of lithium sheet, is arranged on lithium
During sheet one side, when lithium composite sheet uses in the battery, lithium metaaluminate material layer can play towards positive plate and delay lithium ion to expand
Dissipating the effect of speed, lithium metaaluminate material layer then can play the effect avoiding Li dendrite to pierce through barrier film towards barrier film.When inclined aluminum
When acid lithium material layer is arranged on two surfaces of lithium sheet, then can simultaneously work as above-mentioned both sides effect.
In order to avoid lithium sheet exposes in the electrolytic solution, described lithium metaaluminate material layer is coated on lithium sheet surface.
Described lithium metaaluminate material layer includes lithium metaaluminate, conductive agent, binding agent.Conductive agent can improve inclined aluminum further
The electron conduction of acid lithium material layer, described conductive agent can use conductive agent commonly used in the art, it is generally preferable to uses graphite
Alkene.Binding agent can make lithium metaaluminate combine closely with lithium sheet, it is to avoid in charge and discharge process, lithium metaaluminate material pull-up falls, viscous
Knot agent can use binding agent commonly used in the art, and general is preferably used Kynoar.
Lithium metaaluminate, conductive agent, the mass ratio of binding agent can regulate as required, general, in order to strengthen meta-aluminic acid
The firmness that lithium is combined with lithium sheet, described lithium metaaluminate, conductive agent, the mass ratio of binding agent are 1～5:1～5:10～30.
The thickness of lithium sheet and the thickness of lithium metaaluminate material layer can be arranged depending on concrete pole piece thickness, ensureing benefit lithium
The energy density to battery is avoided to produce considerable influence on the basis of Chong Fen.General, the thickness of described lithium sheet is 10-50 μm.
The thickness of described lithium metaaluminate material layer is 1-5 μm.
Described lithium sheet is inertia lithium sheet.Inertia lithium sheet is used to can ensure that in lithium composite sheet and cell manufacturing process, lithium
Sheet is not oxidized.
The technical scheme of the preparation method of the lithium ion battery lithium composite sheet of the present invention is:
The preparation method of above-mentioned lithium ion battery lithium composite sheet, comprises the steps:
1) lithium metaaluminate, conductive agent, binding agent addition solvent will make lithium metaaluminate slurry；
2) lithium metaaluminate slurry is coated in lithium sheet surface, is dried and forms lithium metaaluminate material layer, to obtain final product.
The preparation method of the lithium ion battery lithium composite sheet of the present invention use close starch, coat, dry mode obtains partially
Lithium aluminate material layer, method is simple to operation, can be conducive to saving with existing lithium battery preparation technology general manufacture equipment
Cost.
Above-mentioned solvent is chosen so that lithium metaaluminate and conductive agent, the solvent of binding agent fine dispersion, general, described molten
Agent is N-methyl ketopyrrolidine.
Step 1) in lithium metaaluminate, conductive agent, binding agent add in solvent, prepare lithium metaaluminate slurry after stirring 4h.
Step 2) middle coating employing spraying method.
The technical scheme of the lithium ion battery of the present invention is:
A kind of lithium ion battery, including positive plate, negative plate, barrier film, it is characterised in that between described barrier film and positive plate
It is provided with above-mentioned lithium ion battery lithium composite sheet.
Described positive plate includes that plus plate current-collecting body, negative plate include negative current collector, plus plate current-collecting body and negative current collector
In at least one there is network structure.
Described plus plate current-collecting body is netted aluminium foil.Described negative current collector is netted Copper Foil.Described cancellated mesh
For circular or rhombus.A diameter of 20-30 μm of described mesh.Described cancellated porosity is 40-50%.
The thickness of plus plate current-collecting body and negative current collector is 10-20 μm.
The invention has the beneficial effects as follows:
The lithium ion battery of the present invention uses lithium ion battery lithium composite sheet, it is possible to supplement cathode pole piece and fill first
The irreversible lithium consumed in electric process, improves efficiency first and the energy density of lithium ion battery.Lithium sheet surface is arranged partially
Lithium aluminate material layer, on the one hand lithium metaaluminate material can slow down the lithium sheet embedding lithium speed to anode pole piece, simultaneously again can be effective
The Li dendrite formed in the metallic particles of residual, charge and discharge process after ground suppression benefit lithium pierces through isolating membrane, and then it is hidden to reduce safety
Suffer from, reduce the self discharge that lithium ion battery micro-short circuit causes.During it addition, lithium composite sheet uses in lithium ion battery, meta-aluminic acid
Lithium material layer can protect internal lithium sheet not oxidized, it is ensured that mends the persistence of lithium.
The lithium ion battery of the present invention uses reticulated collectors, lithium ion can be made to pass through collector mesh and in layer make
Lithium ion is delivered to cathode pole piece, not only can supplement the lithium ion that in cathode pole piece cyclic process, SEI consumes, it is also possible to improve
The energy density of lithium ion battery.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lithium ion battery in the embodiment of the present invention 1.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described further.
Embodiment 1
The lithium ion battery of the present embodiment lithium composite sheet, including lithium sheet and the lithium metaaluminate that is coated on two surfaces of lithium sheet
Material layer, lithium metaaluminate material layer is made up of the lithium metaaluminate uniformly mixing and being bonded together, conductive agent, binding agent；Aluminum partially
Acid lithium, conductive agent, the mass ratio of binding agent are 3:3:20；Wherein, conductive agent is Graphene, and binding agent is Kynoar；Lithium
Sheet is inertia lithium sheet, and the thickness of lithium sheet is 20 μm, and the thickness of lithium metaaluminate material layer is 3 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet comprises the steps:
1) 20g Kynoar is added in 100g N-methyl ketopyrrolidine (NMP), after stirring, stand 4h, Xiang Qi
Middle addition 3g lithium metaaluminate, 3g Graphene, stir 4h in high speed dispersor, obtain lithium metaaluminate slurry；
2) by step 1) in the lithium metaaluminate slurry for preparing be coated in two surfaces of lithium sheet by spraying method, at 80 DEG C
Under be dried 4h, obtain lithium ion battery lithium composite sheet.
As it is shown in figure 1, the lithium ion battery of the present embodiment is laminated battery plate, including positive plate 1, negative plate 2, barrier film 3,
Above-mentioned lithium ion battery lithium composite sheet 4 it is folded with between positive plate and barrier film；Positive plate includes plus plate current-collecting body 11 and coating
At the positive electrode material layer 12 on two surfaces of plus plate current-collecting body, plus plate current-collecting body is netted aluminium foil, and the thickness of aluminium foil is 25 μm, aluminium foil
On mesh be circular port, a diameter of 25 μm, porosity is 50%；Positive electrode material layer is by uniformly mixing and being just bonded together
Pole active compound lithium iron phosphate, conductive agent, binding agent form；Negative plate includes negative current collector 21 and is coated in negative current collector
The negative electrode material layer 22 on two surfaces, negative current collector is netted Copper Foil, and the thickness of Copper Foil is 15 μm, and the mesh on Copper Foil is circle
Shape hole, a diameter of 25 μm, porosity is 45%；Negative electrode material layer is by the negative electrode active material stone uniformly mixed and be bonded together
Ink, conductive agent, binding agent form.
The preparation method of above-mentioned lithium ion battery comprises the steps:
LiFePO4, conductive agent, binding agent are closed slurry and make anode sizing agent, is coated in two surfaces of plus plate current-collecting body, dry
Dry, prepare positive plate；Graphite, conductive agent, binding agent are closed slurry and make cathode size, is coated in two surfaces of negative current collector,
It is dried, prepares negative plate；By laminating machine successively by negative plate, barrier film, lithium ion battery lithium composite sheet, positive plate, barrier film
Carrying out lamination, soldering polar ear prepares battery core, enters shell, fluid injection, encapsulation, prepares 5Ah soft bag lithium ionic cell；In electrolyte, electricity
Solution matter is LiPF6, solvent is EC and DEC of volume ratio 1:1, and barrier film is Celgard 2400 film.
Embodiment 2
The lithium ion battery of the present embodiment lithium composite sheet, including lithium sheet and the lithium metaaluminate that is coated on two surfaces of lithium sheet
Material layer, lithium metaaluminate material layer is made up of the lithium metaaluminate uniformly mixing and being bonded together, conductive agent, binding agent；Aluminum partially
Acid lithium, conductive agent, the mass ratio of binding agent are 1:1:10；Wherein, conductive agent is Graphene, and binding agent is Kynoar；Lithium
Sheet is inertia lithium sheet, and the thickness of lithium sheet is 10 μm, and the thickness of lithium metaaluminate material layer is 1 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet comprises the steps:
1) 10g Kynoar is added in 100g N-methyl ketopyrrolidine (NMP), after stirring, stand 4h, Xiang Qi
Middle addition 1g lithium metaaluminate, 1g Graphene, stir 4h in high speed dispersor, obtain lithium metaaluminate slurry；
2) by step 1) in the lithium metaaluminate slurry for preparing be coated in two surfaces of lithium sheet by spraying method, at 80 DEG C
Under be dried 4h, obtain lithium ion battery lithium composite sheet.
The lithium ion battery of the present embodiment is laminated battery plate, including positive plate, negative plate, barrier film, positive plate and barrier film
Between be folded with above-mentioned lithium ion battery lithium composite sheet；Positive plate includes plus plate current-collecting body and is coated in plus plate current-collecting body two
The positive electrode material layer on surface, plus plate current-collecting body is netted aluminium foil, and the thickness of aluminium foil is 20 μm, and the mesh on aluminium foil is circular port,
A diameter of 20 μm, porosity is 40%；Positive electrode material layer is by the positive active material iron phosphate uniformly mixed and be bonded together
Lithium, conductive agent, binding agent form；Negative plate includes negative current collector and is coated in the negative material on two surfaces of negative current collector
Layer, negative current collector is netted Copper Foil, and the thickness of Copper Foil is 10 μm, and the mesh on Copper Foil is circular port, a diameter of 20 μm, hole
Rate is 40%；Negative electrode material layer is by the negative electrode active material graphite uniformly mixed and be bonded together, conductive agent, binding agent group
Become.
The preparation method of above-mentioned lithium ion battery comprises the steps:
LiFePO4, conductive agent, binding agent are closed slurry and make anode sizing agent, is coated in two surfaces of plus plate current-collecting body, dry
Dry, prepare positive plate；Graphite, conductive agent, binding agent are closed slurry and make cathode size, is coated in two surfaces of negative current collector,
It is dried, prepares negative plate；By laminating machine successively by negative plate, barrier film, lithium ion battery lithium composite sheet, positive plate, barrier film
Carrying out lamination, soldering polar ear prepares battery core, enters shell, fluid injection, encapsulation, prepares 5Ah soft bag lithium ionic cell；In electrolyte, electricity
Solution matter is LiPF6, solvent is EC and DEC of volume ratio 1:1, and barrier film is Celgard 2400 film.
Embodiment 3
The lithium ion battery of the present embodiment lithium composite sheet, including lithium sheet and the lithium metaaluminate that is coated on two surfaces of lithium sheet
Material layer, lithium metaaluminate material layer is made up of the lithium metaaluminate uniformly mixing and being bonded together, conductive agent, binding agent；Aluminum partially
Acid lithium, conductive agent, the mass ratio of binding agent are 5:5:30；Wherein, conductive agent is Graphene, and binding agent is Kynoar；Lithium
Sheet is inertia lithium sheet, and the thickness of lithium sheet is 50 μm, and the thickness of lithium metaaluminate material layer is 5 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet comprises the steps:
1) 30g Kynoar is added in 100g N-methyl ketopyrrolidine (NMP), after stirring, stand 4h, Xiang Qi
Middle addition 5g lithium metaaluminate, 5g Graphene, stir 4h in high speed dispersor, obtain lithium metaaluminate slurry；
2) by step 1) in the lithium metaaluminate slurry for preparing be coated in two surfaces of lithium sheet by spraying method, at 80 DEG C
Under be dried 4h, obtain lithium ion battery lithium composite sheet.
The lithium ion battery of the present embodiment is laminated battery plate, including positive plate, negative plate, barrier film, positive plate and barrier film
Between be folded with above-mentioned lithium ion battery lithium composite sheet；Positive plate includes plus plate current-collecting body and is coated in plus plate current-collecting body two
The positive electrode material layer on surface, plus plate current-collecting body is netted aluminium foil, and the thickness of aluminium foil is 30 μm, and the mesh on aluminium foil is circular port,
A diameter of 30 μm, porosity is 60%；Positive electrode material layer is by the positive active material iron phosphate uniformly mixed and be bonded together
Lithium, conductive agent, binding agent form；Negative plate includes negative current collector and is coated in the negative material on two surfaces of negative current collector
Layer, negative current collector is netted Copper Foil, and the thickness of Copper Foil is 20 μm, and the mesh on Copper Foil is circular port, a diameter of 30 μm, hole
Rate is 50%；Negative electrode material layer is by the negative electrode active material graphite uniformly mixed and be bonded together, conductive agent, binding agent group
Become.
The preparation method of above-mentioned lithium ion battery comprises the steps:
LiFePO4, conductive agent, binding agent are closed slurry and make anode sizing agent, is coated in two surfaces of plus plate current-collecting body, dry
Dry, prepare positive plate；Graphite, conductive agent, binding agent are closed slurry and make cathode size, is coated in two surfaces of negative current collector,
It is dried, prepares negative plate；By laminating machine successively by negative plate, barrier film, lithium ion battery lithium composite sheet, positive plate, barrier film
Carrying out lamination, soldering polar ear prepares battery core, enters shell, fluid injection, encapsulation, prepares 5Ah soft bag lithium ionic cell；In electrolyte, electricity
Solution matter is LiPF6, solvent is EC and DEC of volume ratio 1:1, and barrier film is Celgard 2400 film.
Comparative example
The bright finish aluminium foil using thickness to be 20 μm, the anode sizing agent in its surface-coated embodiment 1 prepared positive plate；
The shiny copper foil using thickness to be 15 μ m-thick, the cathode size in its surface-coated embodiment 1 prepared negative plate；By folded
Negative plate, barrier film, positive plate are carried out lamination by sheet machine successively, and soldering polar ear prepares battery core, enter shell, fluid injection, encapsulation, prepare
5Ah soft bag lithium ionic cell；In electrolyte, electrolyte is LiPF6, solvent is EC and DEC of volume ratio 1:1, and barrier film is
Celgard 2400 film.
Test example
By the lithium ion battery in embodiment 1-3 and comparative example at 25 ± 3 DEG C, with the circulation 500 of 1.0C/1.0C
Secondary it is circulated performance test.
According to lithium ion battery discharge capacity first and the quality of battery, the mass-energy calculating lithium ion battery is close
Degree.
Test result is shown in Table 1.
The cycle performance of the lithium ion battery in table 1 embodiment 1-3 and comparative example and energy density
| Project | Cycle performance (500 conservation rates) | Energy density (Wh/kg) |
| Embodiment 1 | 96.9% | 122.5 |
| Embodiment 2 | 96.2% | 121.4 |
| Embodiment 3 | 95.9% | 120.9 |
| Comparative example | 91.5% | 113.5 |
As can be seen from Table 1, the cycle performance of lithium ion battery in embodiment is substantially better than comparative example, and its reason is, electricity
The SEI film formed in the charge and discharge process of pond consumes lithium ion, causes inside battery lithium ion not enough, and the lithium added in the present invention
Composite sheet, owing to forming lithium ion in charge and discharge process, can supplement the lithium ion in electrolyte in time, improves in electrolyte
The transfer rate of lithium ion, improves its cycle performance.Further, use reticulated collectors, electricity shared by collector can be reduced
The mass ratio in pond, thus improve the energy density of lithium ion battery.
Claims (9)
1. a lithium ion battery lithium composite sheet, including lithium sheet, it is characterised in that described lithium sheet Surface coating has lithium metaaluminate
Material layer, described lithium metaaluminate material layer includes lithium metaaluminate.
Lithium ion battery lithium composite sheet the most according to claim 1, it is characterised in that: described lithium metaaluminate material layer bag
Include lithium metaaluminate, conductive agent, binding agent.
Lithium ion battery lithium composite sheet the most according to claim 2, it is characterised in that: described lithium metaaluminate, conductive agent,
The mass ratio of binding agent is 1～5:1～5:10～30.
Lithium ion battery lithium composite sheet the most according to claim 1, it is characterised in that: the thickness of described lithium sheet is 10-
50μm。
Lithium ion battery lithium composite sheet the most according to claim 1, it is characterised in that: described lithium metaaluminate material layer
Thickness is 1-5 μm.
6. the lithium ion battery preparation method of lithium composite sheet as claimed in claim 1, it is characterised in that include walking as follows
Rapid:
1) lithium metaaluminate, conductive agent, binding agent addition solvent will make lithium metaaluminate slurry；
2) lithium metaaluminate slurry is coated in lithium sheet surface, is dried and forms lithium metaaluminate material layer, to obtain final product.
7. the lithium ion battery preparation method of lithium composite sheet as claimed in claim 6, it is characterised in that described solvent is N-
Methyl pyrrolidone.
8. a lithium ion battery, including positive plate, negative plate, barrier film, it is characterised in that set between described barrier film and positive plate
It is equipped with lithium ion battery lithium composite sheet as claimed in claim 1.
9. lithium ion battery as claimed in claim 8, it is characterised in that described positive plate includes plus plate current-collecting body, negative plate
Including at least one in negative current collector, plus plate current-collecting body and negative current collector, there is network structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109273670A (en) * | 2017-07-18 | 2019-01-25 | 中国科学院上海硅酸盐研究所 | A kind of lithium anode and preparation method thereof with high-specific-surface mesoporous protective film |
| CN109860508A (en) * | 2018-12-17 | 2019-06-07 | 惠州佳合能新能源科技有限公司 | Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode |
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| CN109273670A (en) * | 2017-07-18 | 2019-01-25 | 中国科学院上海硅酸盐研究所 | A kind of lithium anode and preparation method thereof with high-specific-surface mesoporous protective film |
| CN109860508A (en) * | 2018-12-17 | 2019-06-07 | 惠州佳合能新能源科技有限公司 | Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode |
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