CN106159201B - 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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- CN106159201B CN106159201B CN201610612920.8A CN201610612920A CN106159201B CN 106159201 B CN106159201 B CN 106159201B CN 201610612920 A CN201610612920 A CN 201610612920A CN 106159201 B CN106159201 B CN 106159201B
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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 sheets and preparation method thereof, lithium ion battery, belong to technical field of lithium ion.Lithium ion battery of the invention lithium composite sheet, including lithium piece, the lithium piece surface are coated with lithium metaaluminate material layer, and the lithium metaaluminate material layer includes lithium metaaluminate.Lithium ion battery of the invention is applied in lithium ion battery with lithium composite sheet, the irreversible lithium that cathode pole piece consumes during initial charge can be supplemented, the stable structure that pole piece can also be kept in lithium ion battery charge and discharge process is conducive to the cycle life for improving lithium ion battery.When internal temperature of lithium ion battery rises, also it can preferably keep battery core that serious structure change does not occur.
Description
Technical field
The present invention relates to a kind of lithium ion battery lithium composite sheets and preparation method thereof, lithium ion battery, belong to lithium ion
Battery technology field.
Background technique
As lithium ion battery is widely used in the fields such as electric car, number, electric tool and its energy storage, using city
Requirement of the field to the energy density of lithium ion battery, cycle life and its security performance is also continuously improved.
A part of electrolyte can be consumed due to forming SEI in lithium ion battery cyclic process, will cause electricity after long-term circulation
Lithium ion is insufficient in the electrolyte inside of pond, influences the transmission rate of its lithium ion, reduces the cycle performance of battery.
In order to make up this lithium ion loss, has benefit lithium layer is set to pole piece benefit lithium using in pole piece cathode in the prior art
Method.Application publication number is that the Chinese invention patent of CN103401016A discloses a kind of lithium ion battery with high energy density,
The lithium ion battery includes that anode pole piece, cathode pole piece, isolation film and the anode between anode pole piece and isolation film are mended
Lithium layer, it is lithium piece, lithium powder etc. that anode, which mends lithium layer,.Lithium in the lithium ion battery is easy to remain in electrode surface formation lithium metal
Particle causes to pierce through diaphragm and cause security risk.In order to avoid remaining metallic particles or Li dendrite pierce through diaphragm, the hair
Two layers of polymers conductive layer is provided in bright on mending lithium layer, one layer of setting is in anode pole piece and mends between lithium layer, for slowing down
Lithium layer is mended to the benefit lithium speed of anode pole piece, another layer of setting is being mended between lithium layer and diaphragm, for inhibiting remaining metal
Grain, Li dendrite pierce through diaphragm, reduce micro-short circuit, reduce security risk.
In above-mentioned lithium ion battery, is slowed down using polymeric, conductive layer and mend lithium speed, and avoid metallic particles or lithium
Dendrite pierces through diaphragm, and polymeric, conductive layer is mixed using polymer, ion conductive material, electronic conductive material, made
The impedance of ion conductive material is higher, and the charge and discharge invertibity of battery is caused to reduce, and in charge and discharge process and warm
Structure and volume change when degree variation is also more obvious, is unfavorable for improving the cycle performance of ion battery.
Summary of the invention
It is multiple with lithium that the purpose of the present invention is to provide a kind of lithium ion batteries that can be improved cycle performance of lithium ion battery
Close piece.The object of the invention is also to provide the above-mentioned lithium ion battery preparation method of lithium composite sheet and use the lithium ion
The lithium ion battery of battery lithium composite sheet.
To achieve the above object, lithium ion battery of the invention is with the technical solution of lithium composite sheet:
A kind of lithium ion battery lithium composite sheet, including lithium piece, the lithium piece surface are coated with lithium metaaluminate material layer.
Lithium metaaluminate material layer is arranged on lithium piece surface with lithium composite sheet in lithium ion battery of the invention, both can guarantee lithium piece
The irreversible lithium that supplement cathode pole piece consumes during initial charge, first charge discharge efficiency and the energy for improving lithium ion battery are close
Degree, and lithium piece can be slowed down using lithium metaaluminate material to the embedding lithium speed of anode pole piece, it can also effectively inhibit residual after mending lithium
The Li dendrite formed in the metallic particles that stays, charge and discharge process pierces through isolation film, and then reduces security risk, reduces lithium-ion electric
Self discharge caused by the micro-short circuit of pond.The ionic conductivity of lithium metaaluminate material is very strong, has very high conduction to lithium ion
Ability can increase substantially the efficiency of transmission of lithium ion, also have stronger electron conduction, advantageously reduce the interior of battery
Resistance.Lithium metaaluminate chemical stability also with higher and thermal stability, will not generate in lithium ion battery charge and discharge process
Biggish volume change, additionally it is possible to which the stable structure that pole piece is kept in lithium ion battery charge and discharge process is conducive to improve lithium
The cycle life of ion battery.When internal temperature of lithium ion battery rises, battery core also can be preferably kept not occur serious
Structure change.In addition, lithium metaaluminate is coated in lithium piece, lithium composite sheet is in lithium ion battery in use, lithium metaaluminate material
Layer can protect internal lithium piece not oxidized, guarantee the duration for mending lithium.
Lithium metaaluminate material layer can be set the single side in lithium piece and also can be set on two surfaces of lithium piece, be arranged in lithium
When piece single side, lithium composite sheet delays lithium ion to expand in use, lithium metaaluminate material layer can be played towards positive plate in the battery
The effect of rate is dissipated, lithium metaaluminate material layer can then play the role of that Li dendrite is avoided to pierce through diaphragm towards diaphragm.When inclined aluminium
Sour lithium material layer is arranged at two surfaces of lithium piece, then can play the role of above-mentioned both sides simultaneously.
In the electrolytic solution in order to avoid lithium piece exposure, the lithium metaaluminate material layer is coated on lithium piece surface.
The lithium metaaluminate material layer includes lithium metaaluminate, conductive agent, binder.Conductive agent can further increase inclined aluminium
Conductive agent commonly used in the art can be used in the electron conduction of sour lithium material layer, the conductive agent, it is generally preferable to use graphite
Alkene.Binder can make lithium metaaluminate combine closely with lithium piece, and the lithium metaaluminate material layer in charge and discharge process is avoided to fall off, and glue
Binder commonly used in the art can be used in knot agent, and general it is preferable to use Kynoar.
Lithium metaaluminate, conductive agent, binder mass ratio can be adjusted according to the needs, in general, in order to enhance meta-aluminic acid
Firmness of the lithium in conjunction with lithium piece, the lithium metaaluminate, conductive agent, binder mass ratio be 1~5:1~5:10~30.
The thickness of lithium piece and the thickness of lithium metaaluminate material layer can be arranged depending on specific pole piece thickness, guarantee to mend lithium
It avoids producing bigger effect the energy density of battery on the basis of adequately.In general, the lithium piece with a thickness of 10-50 μm.
The lithium metaaluminate material layer with a thickness of 1-5 μm.
The lithium piece is inertia lithium piece.It can be guaranteed in lithium composite sheet and cell manufacturing process using inertia lithium piece, lithium
Piece is not oxidized.
Lithium ion battery of the invention is with the technical solution of the preparation method of lithium composite sheet:
The above-mentioned lithium ion battery preparation method of lithium composite sheet, includes the following steps:
1) lithium metaaluminate, conductive agent, binder are added in solvent and lithium metaaluminate slurry is made；
2) lithium metaaluminate slurry is coated in lithium piece surface, it is dry formed lithium metaaluminate material layer to get.
Lithium ion battery of the invention is obtained partially by the way of closing slurry, coating, drying with the preparation method of lithium composite sheet
Lithium aluminate material layer, method is simple to operation, can be conducive to save with the existing general manufacturing equipment of lithium battery preparation process
Cost.
Above-mentioned solvent selection can make the solvent of lithium metaaluminate and conductive agent, binder fine dispersion, in general, described molten
Agent is N-methyl pyrrolidones.
Lithium metaaluminate, conductive agent, binder are added in solvent in step 1), and lithium metaaluminate slurry is made after stirring 4h.
Coating uses spraying method in step 2).
The technical solution of lithium ion battery of the invention is:
A kind of lithium ion battery, including positive plate, negative electrode tab, diaphragm, which is characterized in that between the diaphragm and positive plate
It is provided with above-mentioned lithium ion battery lithium composite sheet.
The positive plate includes plus plate current-collecting body, and negative electrode tab includes negative current collector, plus plate current-collecting body and negative current collector
At least one of have reticular structure.
The plus plate current-collecting body is netted aluminium foil.The negative current collector is netted copper foil.The mesh of the reticular structure
For round or diamond shape.The diameter of the mesh is 20-30 μm.The porosity of the reticular structure is 40-50%.
Plus plate current-collecting body and negative current collector with a thickness of 10-20 μm.
The beneficial effects of the present invention are:
Lithium ion battery lithium composite sheet is used in lithium ion battery of the invention, can be supplemented cathode pole piece and be filled for the first time
The irreversible lithium consumed in electric process improves the first charge discharge efficiency and energy density of lithium ion battery.The setting of lithium piece surface is inclined
On the one hand lithium aluminate material layer, lithium metaaluminate material can slow down lithium piece to the embedding lithium speed of anode pole piece, while again can be effective
The Li dendrite that ground inhibits to mend remaining metallic particles after lithium, is formed in charge and discharge process pierces through isolation film, and then it is hidden to reduce safety
Suffer from, reduces self discharge caused by lithium ion battery micro-short circuit.In addition, lithium composite sheet is in lithium ion battery in use, meta-aluminic acid
Lithium material layer can protect internal lithium piece not oxidized, guarantee the duration for mending lithium.
Lithium ion battery of the invention uses reticulated collectors, and lithium ion can be made to make in layer by collector mesh
Lithium ion is transmitted to cathode pole piece, can not only supplement the lithium ion that SEI is consumed in cathode pole piece cyclic process, can also improve
The energy density of lithium ion battery.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the lithium ion battery in the embodiment of the present invention 1.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Embodiment 1
The lithium ion battery of the present embodiment lithium composite sheet including lithium piece and is coated on the lithium metaaluminate on two surfaces of lithium piece
Material layer, lithium metaaluminate material layer are made of the lithium metaaluminate, conductive agent, binder for uniformly mixing and being bonded together；Inclined aluminium
Sour lithium, conductive agent, binder mass ratio be 3:3:20；Wherein, conductive agent is graphene, and binder is Kynoar；Lithium
Piece is inertia lithium piece, lithium piece with a thickness of 20 μm, lithium metaaluminate material layer with a thickness of 3 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet includes the following steps:
1) 20g Kynoar is added in 100g N-methyl pyrrolidones (NMP), stands 4h, Xiang Qi after mixing evenly
Middle addition 3g lithium metaaluminate, 3g graphene, 4h is stirred in high speed disperser, obtains lithium metaaluminate slurry；
2) lithium metaaluminate slurry obtained in step 1) is coated in two surfaces of lithium piece by spraying method, at 80 DEG C
Lower dry 4h obtains lithium ion battery lithium composite sheet.
As shown in Figure 1, the lithium ion battery of the present embodiment is laminated battery plate, including positive plate 1, negative electrode tab 2, diaphragm 3,
Above-mentioned lithium ion battery lithium composite sheet 4 is folded between positive plate and diaphragm；Positive plate includes plus plate current-collecting body 11 and coating
Positive electrode material layer 12 on two surfaces of plus plate current-collecting body, plus plate current-collecting body are netted aluminium foil, aluminium foil with a thickness of 25 μm, aluminium foil
On mesh be round hole, diameter be 25 μm, porosity 50%；Positive electrode material layer is by uniformly mixing and being bonded together just
Pole active compound lithium iron phosphate, conductive agent, binder composition；Negative electrode tab include negative current collector 21 and be coated in negative current collector
The negative electrode material layer 22 on two surfaces, negative current collector are netted copper foil, copper foil with a thickness of 15 μm, mesh on copper foil is circle
Shape hole, diameter are 25 μm, porosity 45%；Negative electrode material layer is by the negative electrode active material stone that uniformly mixes and be bonded together
Ink, conductive agent, binder composition.
The preparation method of above-mentioned lithium ion battery includes the following steps:
LiFePO4, conductive agent, binder are closed into slurry, anode sizing agent is made, be coated in two surfaces of plus plate current-collecting body, done
It is dry, positive plate is made；Graphite, conductive agent, binder are closed into slurry, negative electrode slurry are made, is coated in two surfaces of negative current collector,
It is dry, negative electrode tab is made；By laminating machine successively by negative electrode tab, diaphragm, lithium ion battery lithium composite sheet, positive plate, diaphragm
Lamination is carried out, battery core is made in soldering polar ear, enters shell, fluid injection, and 5Ah soft bag lithium ionic cell is prepared in encapsulation；In electrolyte, electricity
Solution matter is LiPF6, solvent is the EC and DEC of volume ratio 1:1, and diaphragm is 2400 film of Celgard.
Embodiment 2
The lithium ion battery of the present embodiment lithium composite sheet including lithium piece and is coated on the lithium metaaluminate on two surfaces of lithium piece
Material layer, lithium metaaluminate material layer are made of the lithium metaaluminate, conductive agent, binder for uniformly mixing and being bonded together；Inclined aluminium
Sour lithium, conductive agent, binder mass ratio be 1:1:10；Wherein, conductive agent is graphene, and binder is Kynoar；Lithium
Piece is inertia lithium piece, lithium piece with a thickness of 10 μm, lithium metaaluminate material layer with a thickness of 1 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet includes the following steps:
1) 10g Kynoar is added in 100g N-methyl pyrrolidones (NMP), stands 4h, Xiang Qi after mixing evenly
Middle addition 1g lithium metaaluminate, 1g graphene, 4h is stirred in high speed disperser, obtains lithium metaaluminate slurry；
2) lithium metaaluminate slurry obtained in step 1) is coated in two surfaces of lithium piece by spraying method, at 80 DEG C
Lower dry 4h obtains lithium ion battery lithium composite sheet.
The lithium ion battery of the present embodiment is laminated battery plate, including positive plate, negative electrode tab, diaphragm, positive plate and diaphragm
Between be folded with above-mentioned lithium ion battery lithium composite sheet；Positive plate include plus plate current-collecting body and be coated in plus plate current-collecting body two
The positive electrode material layer on surface, plus plate current-collecting body are netted aluminium foil, aluminium foil with a thickness of 20 μm, mesh on aluminium foil is round hole,
Diameter is 20 μm, porosity 40%；Positive electrode material layer is by the positive active material ferric phosphate that uniformly mixes and be bonded together
Lithium, conductive agent, binder composition；Negative electrode tab includes negative current collector and the negative electrode material coated in two surfaces of negative current collector
Layer, negative current collector are netted copper foil, copper foil with a thickness of 10 μm, mesh on copper foil is round hole, and diameter is 20 μm, hole
Rate is 40%；Negative electrode material layer is by the negative electrode active material graphite, conductive agent, binder group that uniformly mix and be bonded together
At.
The preparation method of above-mentioned lithium ion battery includes the following steps:
LiFePO4, conductive agent, binder are closed into slurry, anode sizing agent is made, be coated in two surfaces of plus plate current-collecting body, done
It is dry, positive plate is made；Graphite, conductive agent, binder are closed into slurry, negative electrode slurry are made, is coated in two surfaces of negative current collector,
It is dry, negative electrode tab is made；By laminating machine successively by negative electrode tab, diaphragm, lithium ion battery lithium composite sheet, positive plate, diaphragm
Lamination is carried out, battery core is made in soldering polar ear, enters shell, fluid injection, and 5Ah soft bag lithium ionic cell is prepared in encapsulation；In electrolyte, electricity
Solution matter is LiPF6, solvent is the EC and DEC of volume ratio 1:1, and diaphragm is 2400 film of Celgard.
Embodiment 3
The lithium ion battery of the present embodiment lithium composite sheet including lithium piece and is coated on the lithium metaaluminate on two surfaces of lithium piece
Material layer, lithium metaaluminate material layer are made of the lithium metaaluminate, conductive agent, binder for uniformly mixing and being bonded together；Inclined aluminium
Sour lithium, conductive agent, binder mass ratio be 5:5:30；Wherein, conductive agent is graphene, and binder is Kynoar；Lithium
Piece is inertia lithium piece, lithium piece with a thickness of 50 μm, lithium metaaluminate material layer with a thickness of 5 μm.
The preparation method of above-mentioned lithium ion battery lithium composite sheet includes the following steps:
1) 30g Kynoar is added in 100g N-methyl pyrrolidones (NMP), stands 4h, Xiang Qi after mixing evenly
Middle addition 5g lithium metaaluminate, 5g graphene, 4h is stirred in high speed disperser, obtains lithium metaaluminate slurry；
2) lithium metaaluminate slurry obtained in step 1) is coated in two surfaces of lithium piece by spraying method, at 80 DEG C
Lower dry 4h obtains lithium ion battery lithium composite sheet.
The lithium ion battery of the present embodiment is laminated battery plate, including positive plate, negative electrode tab, diaphragm, positive plate and diaphragm
Between be folded with above-mentioned lithium ion battery lithium composite sheet；Positive plate include plus plate current-collecting body and be coated in plus plate current-collecting body two
The positive electrode material layer on surface, plus plate current-collecting body are netted aluminium foil, aluminium foil with a thickness of 30 μm, mesh on aluminium foil is round hole,
Diameter is 30 μm, porosity 60%；Positive electrode material layer is by the positive active material ferric phosphate that uniformly mixes and be bonded together
Lithium, conductive agent, binder composition；Negative electrode tab includes negative current collector and the negative electrode material coated in two surfaces of negative current collector
Layer, negative current collector are netted copper foil, copper foil with a thickness of 20 μm, mesh on copper foil is round hole, and diameter is 30 μm, hole
Rate is 50%；Negative electrode material layer is by the negative electrode active material graphite, conductive agent, binder group that uniformly mix and be bonded together
At.
The preparation method of above-mentioned lithium ion battery includes the following steps:
LiFePO4, conductive agent, binder are closed into slurry, anode sizing agent is made, be coated in two surfaces of plus plate current-collecting body, done
It is dry, positive plate is made；Graphite, conductive agent, binder are closed into slurry, negative electrode slurry are made, is coated in two surfaces of negative current collector,
It is dry, negative electrode tab is made；By laminating machine successively by negative electrode tab, diaphragm, lithium ion battery lithium composite sheet, positive plate, diaphragm
Lamination is carried out, battery core is made in soldering polar ear, enters shell, fluid injection, and 5Ah soft bag lithium ionic cell is prepared in encapsulation；In electrolyte, electricity
Solution matter is LiPF6, solvent is the EC and DEC of volume ratio 1:1, and diaphragm is 2400 film of Celgard.
Comparative example
Anode sizing agent and obtained positive plate using the smooth surface aluminium foil with a thickness of 20 μm, in its surface coating embodiment 1；
Negative electrode slurry and obtained negative electrode tab using the shiny copper foil with a thickness of 15 μ m-thicks, in its surface coating embodiment 1；By folded
Negative electrode tab, diaphragm, positive plate are successively carried out lamination by piece machine, and battery core is made in soldering polar ear, enter shell, fluid injection, and encapsulation is prepared
5Ah soft bag lithium ionic cell；In electrolyte, electrolyte LiPF6, solvent is the EC and DEC of volume ratio 1:1, and diaphragm is
2400 film of Celgard.
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 progress cycle performance test.
According to lithium ion battery, discharge capacity and the quality of battery, the mass-energy for calculating lithium ion battery are close for the first time
Degree.
Test result is shown in Table 1.
The cycle performance and energy density of 1 embodiment 1-3 of table and the lithium ion battery in comparative example
| 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, the reason for this is that electric
The SEI film consumption lithium ion formed in the charge and discharge process of pond, causes inside battery lithium ion insufficient, and the lithium being added in the present invention
The lithium ion in electrolyte can be replenished in time due to forming lithium ion in charge and discharge process in composite sheet, improve in electrolyte
The transmission rate of lithium ion improves its cycle performance.Further, using reticulated collectors, electricity shared by collector can be reduced
The mass ratio in pond, to improve the energy density of lithium ion battery.
Claims (6)
1. a kind of lithium ion battery lithium composite sheet, including lithium piece, which is characterized in that the lithium piece surface is coated with lithium metaaluminate
Material layer, the lithium metaaluminate material layer include lithium metaaluminate, conductive agent, binder, and lithium metaaluminate material layer is arranged in lithium piece
Two surfaces；The lithium composite sheet is made by the method included the following steps:
1) lithium metaaluminate, conductive agent, binder are added in solvent and lithium metaaluminate slurry is made；
2) lithium metaaluminate slurry is coated in lithium piece surface, it is dry formed lithium metaaluminate material layer to get；The lithium metaaluminate,
Conductive agent, binder mass ratio be 1~5:1~5:10~30；The solvent is N-Methyl pyrrolidone；
The lithium composite sheet is arranged between the diaphragm of lithium ion battery and positive plate.
2. lithium ion battery according to claim 1 lithium composite sheet, it is characterised in that: the lithium piece with a thickness of 10-
50μm。
3. lithium ion battery according to claim 1 lithium composite sheet, it is characterised in that: the lithium metaaluminate material layer
With a thickness of 1-5 μm.
4. the lithium ion battery as described in claim 1 preparation method of lithium composite sheet, which is characterized in that including walking as follows
It is rapid:
1) lithium metaaluminate, conductive agent, binder are added in solvent and lithium metaaluminate slurry is made；
2) lithium metaaluminate slurry is coated in lithium piece surface, it is dry formed lithium metaaluminate material layer to get；The solvent is N- first
Base pyrrolidones.
5. a kind of lithium ion battery, including positive plate, negative electrode tab, diaphragm, which is characterized in that set between the diaphragm and positive plate
It is equipped with lithium ion battery lithium composite sheet as described in claim 1.
6. lithium ion battery as claimed in claim 5, which is characterized in that the positive plate includes plus plate current-collecting body, negative electrode tab
Including negative current collector, at least one of plus plate current-collecting body and negative current collector have reticular structure.
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| 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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| CN102610861A (en) * | 2012-03-07 | 2012-07-25 | 宁德新能源科技有限公司 | Method for preparing lithium ion battery |
| CN103117382A (en) * | 2013-02-25 | 2013-05-22 | 江苏乐能电池股份有限公司 | Lithium ion battery negative pole material capable of improving safety performance and preparation method thereof |
| CN105226234A (en) * | 2015-09-01 | 2016-01-06 | 中航锂电（洛阳）有限公司 | Lithium battery anode composite sheet, lithium battery composite negative plate and preparation method thereof, lithium battery |
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