CN109962211A - A kind of preparation method of lithium ion battery - Google Patents
A kind of preparation method of lithium ion battery Download PDFInfo
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- CN109962211A CN109962211A CN201910233984.0A CN201910233984A CN109962211A CN 109962211 A CN109962211 A CN 109962211A CN 201910233984 A CN201910233984 A CN 201910233984A CN 109962211 A CN109962211 A CN 109962211A
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- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
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- D—TEXTILES; PAPER
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- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
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- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The present invention relates to a kind of preparation methods of lithium ion battery, belong to battery technology field.In order to solve the problems, such as that the existing poor synchronization internal resistance of cell is big, a kind of preparation method of lithium ion battery is provided, including anode sizing agent and negative electrode slurry are transferred to respectively in corresponding positive syringe and cathode syringe, by anode sizing agent and negative electrode slurry, synchronous electrostatic spinning is coated in the two opposite side surfaces of diaphragm respectively, after drying, positive-active layer and negative electrode active layer are respectively formed in the two opposite side surfaces of diaphragm；Plus plate current-collecting body and negative current collector are respectively corresponded into positive-active layer and negative electrode active layer carries out hot-rolling pressure and is compounded in surface, corresponding lithium ion battery is made using cross cutting and following process.The present invention can reduce the internal resistance of cell, improve the battery chemistries impact of performance.With simple process, easily operated advantage.
Description
Technical field
The present invention relates to a kind of preparation methods of lithium ion battery, belong to battery technology field.
Background technique
Lithium ion battery is a kind of novel Green Chemistry power supply, is had compared with traditional nickel-cadmium cell, nickel-metal hydride battery
The advantage that voltage is high, the service life is long, energy density is big.From after nineteen ninety Sony Corporation of Japan release first generation lithium ion battery, it
Various portable devices have been rapidly developed and be widely used in, the neck such as 3C Product, power device, energy storage device is related to
Domain.Due to flourishing for new-energy automobile, while the demand to power battery is increasing, to its energy and high rate performance
More stringent requirements are proposed, and high-energy and high power lithium battery have become the focus on research direction of battery industry.
Complete lithium ion battery is mainly made of anode, cathode, diaphragm, electrolyte and battery case.Electrode mainly leads to
It crosses in collection liquid surface coating slurry, drying, compacting, finally obtains positive/negative pole piece.It needs in assembly cell process by diaphragm
It is aligned between positive/negative pole piece, finally obtains battery core component by lamination or winding process.It is numerous that the technique assembles battery process
It is trivial, especially in assembling process, needs to realize being aligned and well contacting for electrode slice and diaphragm, avoid the burr in die cutting process
Bring internal short-circuit, the degree of automation is limited, at high cost；Different procedure calls mutually restrict in traditional technology, lead to battery
Consistency is poor.Further, since the interfacial structure of positive/negative pole piece and diaphragm is more complex, the internal resistance of cell is larger, leads to the electricity of battery
Chemical property performance is restricted, meanwhile, existing processing is all to be processed by substep to positive and negative pole material layer, and there are differences
The restriction for walking processing, influences battery performance.
Summary of the invention
The present invention is directed to the above defect existing in the prior art, provides a kind of preparation method of lithium ion battery, solves
The technical issues of be how to realize that synchronism is good and the interfacial resistance of battery can be reduced to reduce the performance of the internal resistance of cell.
The purpose of the present invention is be achieved through the following technical solutions: a kind of preparation method of lithium ion battery, this method
The following steps are included:
A, anode sizing agent and negative electrode slurry are transferred to respectively in corresponding positive syringe and cathode syringe, it will be positive
Synchronous electrostatic spinning is coated in the two opposite side surfaces of diaphragm respectively for slurry and negative electrode slurry, after dry, opposite the two of diaphragm
Positive-active layer and negative electrode active layer are respectively formed on a side；
B, plus plate current-collecting body and negative current collector are respectively corresponded into positive-active layer and negative electrode active layer carries out hot-rolling pressure again
It closes on surface, corresponding lithium ion battery is made using cross cutting and following process.
Anode sizing agent and cathode data are coated in the both side surface of diaphragm respectively by synchronous electrostatic spinning processing,
Can make to form uniform coating by electrostatic spinning, can be formed between diaphragm it is closer cover effect, make shape
At positive-active layer and the formation of negative electrode active layer and diaphragm to connect solution closer, to effectively reduce positive electrode active materials and cathode
Active material realizes the effect for reducing the internal resistance of battery with the interfacial resistance between diaphragm；And positive and negative electrode coating is due to using quiet
Electrospun processing is capable of forming complicated staggered multi-cellular structure, is equivalent to netted structure and morphology, helps to reduce
Polarization phenomena during electrode electro Chemical alleviate the defect of volume expansion, make the chemical stability for improving battery on the whole.
Meanwhile electrospinning coating processing is used by synchronous, the production time is shortened, the mutual shadow between different processes is avoided
It rings, synchronous processing formation improves battery with two side terminals, keeps battery performance more stable, and technical process is simple, is conducive to reality
Border application.
In the preparation method of above-mentioned lithium ion battery, preferably, the condition of synchronous electrostatic spinning described in step A
Are as follows:
The voltage is set as 20~25kV, and spinning flow velocity is 0.6~0.8mL/h, and receiving distance is 15~25cm；And
The metal needle diameter of the anode syringe and cathode syringe is 0.5~0.6mm.Make the granularity of the spinning to be formed and
Uniformity is more superior, and the active layer to be formed can be made to have the effect of preferable high-energy density.
In the preparation method of above-mentioned lithium ion battery, preferably, the surface density of the positive-active layer be 10~
30mg/cm2, the surface density of the negative electrode active layer is 5~20mg/cm2.It handles to be more advantageous to by using electrostatic spinning to be formed
Higher surface density makes that preferable capacity ratio can be reached between positive and negative electrode, and the energy for being conducive to improve lithium ion battery is close
Degree.
In the preparation method of above-mentioned lithium ion battery, preferably, the positive reversible capacity of the lithium ion battery with
The ratio between cathode reversible capacity is 1:1~1:1.3.The specific energy that lithium ion battery can be effectively improved makes further to improve
The multiplying power and energy density of lithium ion battery.
In the preparation method of above-mentioned lithium ion battery, preferably, positive-active layer and negative electrode active described in step A
The thickness of the coating of layer is 50~200 μm.It can guarantee that there is preferable battery performance.
In the preparation method of above-mentioned lithium ion battery, preferably, the temperature of hot-rolling pressure described in step B be 20~
100 DEG C, and the pressure of the hot-rolling pressure is 10~1000N/cm2.Purpose is to be compounded in corresponding collector preferably
Surface reduces the contact resistance between collector and active coating, is conducive to the performance of material property.
In the preparation method of above-mentioned lithium ion battery, preferably, the anode sizing agent includes positive electrode active materials, leads
The mixed slurry of electric agent and binder；The negative electrode slurry includes the mixed slurry of negative electrode active material, conductive agent and binder.
It further include having other solvent compositions such as organic solvent in slurry, solvent here can be NMP, dimethylformamide or acetone
Etc..
In the preparation method of above-mentioned lithium ion battery, preferably, plus plate current-collecting body described in step B be selected from aluminium foil or
Aluminium net；The negative current collector is selected from copper foil or copper mesh.It is easy to get with raw material, advantage at low cost.
In the preparation method of above-mentioned lithium ion battery, preferably, diaphragm described in step A is selected from PP film, PE film, double
Layer PP/PE film, bilayer PP/PP film or three layers of PP/PE/PP film, the surface that the diaphragm is located at positive-active layer side are coated with pottery
Ceramic material layer.The wetting property for being conducive to improve the heat resistance of diaphragm by the surface coated ceramic material layer in diaphragm, makes more
The effective performance for guaranteeing battery.
In conclusion compared with prior art, the present invention having the advantage that
1. by making the positive-active layer surface coated in diaphragm directly synchronous with negative electrode active layer, when shortening production
Between, so that anode and cathode active materials and diaphragm is formed closer composite construction characteristic, reduce the interfacial resistance between them,
It realizes and reduces the internal resistance of cell, improve battery performance effect.
2. the positive and negative electrode active layer to be formed can be made to have compactness good and stablize by using synchronous electrostatic spinning processing
Property high advantage, and there is the advantages of simple process, Yi Li is operated.
Specific embodiment
Below by specific embodiment, the technical solutions of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
This lithium ion battery passes through is transferred to corresponding anode note for the anode sizing agent being uniformly mixed and negative electrode slurry respectively
In emitter and cathode syringe, by anode sizing agent and negative electrode slurry, synchronous electrostatic spinning is coated in opposite two sides of diaphragm respectively
Face is respectively formed positive-active layer and negative electrode active layer in the two opposite side surfaces of diaphragm after dry；Again by plus plate current-collecting body and
Negative current collector respectively corresponds positive-active layer and negative electrode active layer carries out hot-rolling pressure and is compounded in surface, preferably makes the temperature of hot-rolling pressure
Degree is 20~100 DEG C, and the pressure of hot-rolling pressure is 10~1000N/cm2；Optimum condition is that the temperature of hot-rolling pressure is 80 DEG C, and heat
The pressure of roll-in is 120N/cm2；Corresponding lithium ion battery is made using cross cutting and following process, following process here
It such as include winding, tab welding, assembling, vacuum bakeout, fluid injection, chemical conversion, sealing, the obtained lithium ion battery of full capacity test.This
In by synchronous electrospinning process will just, pole slurry is synchronous is coated in corresponding diaphragm both side surface, be capable of forming well
Composite effect makes to effectively reduce interfacial resistance and polarization phenomena.Specifically, the lithium ion battery that this method obtains includes electricity
Core, general lithium ion battery all have shell and electrolyte, and battery core is arranged inside the shell, it is often more important that, this battery core include every
Film, a side surface of diaphragm passes through synchronous electrostatic spinning and is coated with positive-active layer, and coats in another side surface of diaphragm
There is negative electrode active layer, plus plate current-collecting body is compounded on the outside of positive-active layer, is compounded with negative pole currect collecting on the outside of negative electrode active layer
Body.Battery core can be conventional takeup type or stacked design feature.Here electrostatic spinning operation is synchronized, can be avoided use
The difference of different process processing restricts the defect for causing battery performance to decline.
Further scheme can make 10~30mg/cm of surface density of positive-active layer2, the face of negative electrode active layer
Density is 5~20mg/cm2.Can also make the ratio between positive reversible capacity and cathode reversible capacity of lithium ion battery is 1:1~1:
1.3.The performance for being conducive to positive electrode active materials capacity improves the cycle life of battery.Preferably make positive-active layer and cathode living
The thickness of property layer is at 50~200 μm.
Further scheme can also make diaphragm be selected from PP film, PE film, bilayer PP/PE film, bilayer PP/PP film or three
Layer PP/PE/PP film, the surface that the diaphragm is located at positive-active layer side are coated with ceramic material layer, improve the heat resistance of diaphragm
And wellability.The corresponding anode sizing agent of positive-active layer may include positive conductive additive, positive electrode binder, positive solvent,
The mass ratio of positive coating slurry each component is positive electrode active materials: positive conductive additive: positive electrode binder: positive solvent
10~100:1 of mass ratio~20:1~20:5~100.The corresponding negative electrode slurry of negative electrode active layer may include negative conductive addition
Agent, negative electrode binder, cathode solvent, the mass ratio of the component of cathode coating slurry are negative electrode active material: negative conductive addition
Agent: negative electrode binder: 10~100:1 of mass ratio~20:1~20:5~100 of cathode solvent.Further, preferably make anode
Slurry uses nickel-cobalt-manganese ternary material: Super-P: carbon nanotube: the mass ratio of PVDF:NMP is 96:1.5:1:1.5:54；It is negative
Pole slurry uses graphite: Super-P:CMC:SBR: the mass ratio of deionized water improves the stability of battery for 95:2:1:2:72
With the performance of circulation volume conservation rate.The electrolyte of battery is using conventional, it is preferred to use the solute of electrolyte be lithium
Salt, concentration are 0.7~2M, and solute is selected from LiPF6、LiBF6、LiAsF6、LiClF6, any one in LiBOB；Electrolyte it is molten
Agent includes carbonic ester and esters, wherein carbonic ester is selected from ethylene carbonate, propene carbonate, dimethyl carbonate, carbonic acid diethyl
At least one of ester, methyl ethyl carbonate and methyl propyl carbonate, esters are selected from gamma-butyrolacton, methyl formate, Ethyl formate, second
At least one of sour methyl esters, ethyl acetate and ethyl butyrate；It can also make the quality of carbonic ester and esters solvent in electrolyte
Than for 1:2~3:1.Specific manufacture craft explanation is carried out to lithium ion battery of the invention below.
Embodiment 1
It is nickel-cobalt-manganese ternary material: Super-P: carbon nanotube that anode sizing agent in the present embodiment is prepared in mass ratio:
The ratio of PVDF:NMP=96:1.5:1:1.5:54 is prepared；It is graphite: Super-P: carbon that negative electrode slurry is prepared in mass ratio
Nanotube: the ratio of PVDF:NMP=95:2:1:2:72 is prepared.The ratio between reversible capacity and the reversible capacity of cathode of anode
For 1:1.17.Above-mentioned anode sizing agent is respectively transferred to the two of synchronous electrostatic spinning apparatus with negative electrode slurry respectively after mixing evenly
In a syringe, electrostatic spinning processing is synchronized on two opposite sides of diaphragm, wherein diaphragm is using wherein side
Anode sizing agent is coated on the membrane surface for having nano ceramic material side by the double-deck PP/PE film of coating nano ceramic material,
Meanwhile negative electrode slurry being coated on opposite another side surface of diaphragm, wherein the condition of corresponding electrostatic spinning processing
Are as follows: voltage is set as 20kV, and spinning flow velocity is 0.6mL/h, and receiving distance is 20cm；And the positive syringe and cathode are infused
The metal needle diameter of emitter is 0.50mm；After electrostatic spinning, obtain being respectively formed anode on the surface of diaphragm two sides
Active layer and negative electrode active layer, wherein making the surface density 19mg/cm of positive-active layer2, the surface density of negative electrode active layer is
8mg/cm2；Dry 120min is then transferred in vacuum oven at 95 DEG C；Aluminium foil and copper foil are respectively corresponded into positive-active
Layer and negative electrode active layer carry out hot-rolling pressure, in temperature 60 C and pressure 400N/cm2Under carry out compacting make to be compounded in corresponding activity
Layer surface；It is tested using cross cutting, winding, tab welding, assembling, vacuum bakeout, fluid injection, chemical conversion, sealing, full capacity and phase is made
The lithium ion battery answered.Here the shape of battery can be the structures such as cylindrical, rectangular or special-shaped.Use concentration for 1M
The electrolyte of LiPF6-EC/DEC (1:1).Battery capacity retention ratio after 100 circulations is 99%, and battery DC internal resistance is
0.45mΩ.Compared to conventional design, battery capacity improves 10.5% under 1C.
Embodiment 2
It is nickel-cobalt-manganese ternary material: Super-P: carbon nanotube that anode sizing agent in the present embodiment is prepared in mass ratio:
The ratio of PVDF:NMP=96:1.5:1:1.5:54 is prepared；It is graphite: Super-P: carbon that negative electrode slurry is prepared in mass ratio
Nanotube: the ratio of PVDF:NMP=95:2:1:2:72 is prepared.The ratio between reversible capacity and the reversible capacity of cathode of anode
For 1:1.2.Above-mentioned anode sizing agent is respectively transferred to the two of synchronous electrostatic spinning apparatus with negative electrode slurry respectively after mixing evenly
In a syringe, electrostatic spinning processing is synchronized on two opposite sides of diaphragm, wherein diaphragm is using wherein side
Anode sizing agent is coated on the PP film membrane surface for having nano ceramic material side, together by the PP film of coating nano ceramic material
When, negative electrode slurry is coated on PP film every on another side surface of diaphragm, wherein the condition of corresponding electrostatic spinning processing are as follows:
Voltage is set as 20kV, and spinning flow velocity is 0.6mL/h, and receiving distance is 20cm；And positive syringe and cathode syringe
Metal needle diameter is 0.51mm；After electrostatic spinning, obtain being respectively formed positive-active layer on the surface of diaphragm two sides
With negative electrode active layer, wherein making the surface density 30mg/cm of positive-active layer2, the surface density of negative electrode active layer is 14mg/cm2；
Dry 120min is then transferred in vacuum oven at 90 DEG C；Aluminium foil and copper foil are respectively corresponded into positive-active layer and cathode
Active layer carries out hot-rolling pressure, in 80 DEG C of temperature and pressure 1000N/cm2Under carry out compacting and make to be compounded in corresponding active layer surface；
Corresponding lithium is made using cross cutting, winding, tab welding, assembling, vacuum bakeout, fluid injection, chemical conversion, sealing, full capacity test
Ion battery.Use concentration for the electrolyte of 1M LiPF6-EC/DEC (1:1).Battery capacity retention ratio after 100 circulations
It is 99%, battery DC internal resistance is 0.38m Ω.Compared to conventional design, battery capacity improves 12.4% under 1C.
Embodiment 3
It is nickel-cobalt-manganese ternary material: Super-P: carbon nanotube that anode sizing agent in the present embodiment is prepared in mass ratio:
The ratio of PVDF:NMP=96:1.5:1:1.5:54 is prepared；It is graphite: Super-P: carbon that negative electrode slurry is prepared in mass ratio
Nanotube: the ratio of PVDF:NMP=95:2:1:2:72 is prepared.The ratio between reversible capacity and the reversible capacity of cathode of anode
For 1:1.3.Above-mentioned anode sizing agent is respectively transferred to the two of synchronous electrostatic spinning apparatus with negative electrode slurry respectively after mixing evenly
In a syringe, electrostatic spinning processing is synchronized on two opposite sides of diaphragm, wherein diaphragm is using wherein side
Anode sizing agent is coated on the PP film membrane surface for having nano ceramic material side, together by the PP film of coating nano ceramic material
When, negative electrode slurry is coated on PP film every on another side surface of diaphragm, wherein the condition of corresponding electrostatic spinning processing are as follows:
Voltage is set as 25kV, and spinning flow velocity is 0.8mL/h, and receiving distance is 25cm；And the positive syringe and cathode are injected
The metal needle diameter of device is 0.6mm；After electrostatic spinning, obtain being respectively formed positive-active on the surface of diaphragm two sides
Layer and negative electrode active layer, wherein the thickness of the coating of positive-active layer and negative electrode active layer is 10 μm, and makes positive-active layer
Surface density be 30mg/cm2, the surface density of negative electrode active layer is 20mg/cm2；It is then transferred in vacuum oven at 95 DEG C
Dry 120min；Aluminium foil and copper foil are respectively corresponded into positive-active layer and negative electrode active layer and carry out hot-rolling pressure, in 20 DEG C of temperature and
Pressure 10N/cm2Under carry out compacting and make to be compounded in corresponding active layer surface；Using cross cutting, winding, tab welding, assembling,
Corresponding lithium ion battery is made in vacuum bakeout, fluid injection, chemical conversion, sealing, full capacity test.Use concentration for 1M LiPF6-EC/
The electrolyte of DEC (1:1).Battery capacity retention ratio after 100 circulations is 98.5%, and battery DC internal resistance is 0.43m Ω.
Compared to conventional design, battery capacity improves 10.4% under 1C.
Comparative example 1
It is nickel-cobalt-manganese ternary material: Super-P: carbon nanotube that anode sizing agent in this comparative example is prepared in mass ratio:
The ratio of PVDF:NMP=96:1.5:1:1.5:54 is prepared；It is graphite: Super-P: carbon that negative electrode slurry is prepared in mass ratio
Nanotube: the ratio of PVDF:NMP=95:2:1:2:72 is prepared.The ratio between reversible capacity and the reversible capacity of cathode of anode
For 1:1.17.The positive/negative slurry stirred evenly is passed through method of electrostatic spinning respectively, and coated in aluminium foil and copper foil surface, (diaphragm is adopted
Nano ceramic material is coated with the membrane surface of the double-deck PP/PE film of coating nano ceramic material, positive side), it obtains
The surface density of the positive-active layer of plus plate current-collecting body aluminium foil surface is 19mg/cm2, the negative electrode active layer on negative current collector surface
Surface density is 8mg/cm2；Then it is compacted, makes to improve in positive-active layer between particle and between collector by roll-in
Contact, then, using cross cutting, winding, vacuum drying, tab welding, assembling, vacuum bakeout, fluid injection, chemical conversion, sealing, Quan Rong
Lithium ion battery is manufactured experimently to obtain in measurement.Vacuum drying condition is dry 120min at 95 DEG C；Anode pole piece and cathode pole piece roll-in item
Part is normal moderate pressure 400N/cm2.Other process parameter is the same as embodiment 1.Use concentration for 1M LiPF6-EC/DEC's (1:1)
Electrolyte.Battery capacity retention ratio after 100 circulations is 93%, and battery DC internal resistance is 0.8m Ω.
It can be seen that from above-described embodiment and comparative example and be respectively coated on positive and negative electrode afflux compared to by positive and negative electrode slurry
For on the surface of body, the present invention is coated in diaphragm by what synchronous electrostatic spinning made anode sizing agent and negative electrode slurry Direct Uniform
Opposite sides surface form corresponding positive and negative electrode active layer, can make battery have better capacity retention ratio and battery it is straight
Flow the small effect of internal resistance.
Specific embodiment described in the present invention only illustrate the spirit of the present invention by way of example.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
It is skilled to this field although present invention has been described in detail and some specific embodiments have been cited
For technical staff, as long as it is obvious for can making various changes or correct without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of preparation method of lithium ion battery, which is characterized in that method includes the following steps:
A, anode sizing agent and negative electrode slurry are transferred to respectively in corresponding positive syringe and cathode syringe, by anode sizing agent
Synchronous electrostatic spinning is coated in the two opposite side surfaces of diaphragm respectively with negative electrode slurry, after dry, in opposite two sides of diaphragm
Positive-active layer and negative electrode active layer are respectively formed on face；
B, plus plate current-collecting body and negative current collector are respectively corresponded into positive-active layer and negative electrode active layer carries out hot-rolling pressure and is compounded in
Corresponding lithium ion battery is made using cross cutting and following process in surface.
2. the preparation method of lithium ion battery according to claim 1, which is characterized in that synchronous Static Spinning described in step A
The condition of silk are as follows:
The voltage is set as 20~25kV, and spinning flow velocity is 0.6~0.8mL/h, and receiving distance is 15~25cm；And it is described
The metal needle diameter of positive syringe and cathode syringe is 0.5~0.6mm.
3. the preparation method of lithium ion battery according to claim 1, which is characterized in that positive-active layer described in step A
Surface density be 10~30mg/cm2, the surface density of the negative electrode active layer is 5~20mg/cm2。
4. the preparation method of lithium ion battery according to claim 3, which is characterized in that the anode of the lithium ion battery can
Inverse the ratio between capacity and cathode reversible capacity are 1:1~1:1.3.
5. the preparation method of lithium ion battery described in -4 any one according to claim 1, which is characterized in that described in step A
The thickness of the coating of positive-active layer and negative electrode active layer is 50~200 μm.
6. the preparation method of lithium ion battery described in -4 any one according to claim 1, which is characterized in that described in step B
The temperature of hot-rolling pressure is 20~100 DEG C, and the pressure of the hot-rolling pressure is 10~1000N/cm2。
7. the preparation method of lithium ion battery according to claim 1, which is characterized in that the anode sizing agent includes that anode is living
The mixed slurry of property material, conductive agent and binder；The negative electrode slurry includes negative electrode active material, conductive agent and binder
Mixed slurry.
8. the preparation method of lithium ion battery according to claim 1, which is characterized in that plus plate current-collecting body described in step B
Selected from aluminium foil or aluminium net；The negative current collector is selected from copper foil or copper mesh.
9. the preparation method of lithium ion battery according to claim 1, which is characterized in that diaphragm described in step A is selected from PP
Film, PE film, bilayer PP/PE film, bilayer PP/PP film or three layers of PP/PE/PP film, the diaphragm are located at the table of positive-active layer side
Face is coated with ceramic material layer.
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| CN112542569A (en) * | 2020-12-04 | 2021-03-23 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device comprising same and electronic device |
| CN114512631A (en) * | 2022-02-22 | 2022-05-17 | 上海兰钧新能源科技有限公司 | Lithium ion battery composite pole piece and preparation method thereof |
| CN115117365A (en) * | 2022-07-27 | 2022-09-27 | 湖北亿纬动力有限公司 | Carbon-coated current collector and preparation method and application thereof |
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| CN114512631B (en) * | 2022-02-22 | 2023-07-07 | 上海兰钧新能源科技有限公司 | Lithium ion battery composite pole piece and preparation method thereof |
| CN115117365A (en) * | 2022-07-27 | 2022-09-27 | 湖北亿纬动力有限公司 | Carbon-coated current collector and preparation method and application thereof |
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