CN103682418B - Lithium ion battery of a kind of excellent combination property and preparation method thereof - Google Patents
Lithium ion battery of a kind of excellent combination property and preparation method thereof Download PDFInfo
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- CN103682418B CN103682418B CN201310737676.4A CN201310737676A CN103682418B CN 103682418 B CN103682418 B CN 103682418B CN 201310737676 A CN201310737676 A CN 201310737676A CN 103682418 B CN103682418 B CN 103682418B
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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
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses lithium ion battery of a kind of excellent combination property and preparation method thereof, positive and negative plate is comprised one or more Different electrodes by the present invention, comprise active material difference, according to the active material of pole piece, the specification of conductive agent or binding agent, kind, composition are arranged in pairs or groups simultaneously, adjust the coated weight of electrode simultaneously, make lithium ion battery provided by the invention combine the material of various electrode, the advantage of formula and manufacture craft etc., excellent combination property, the many-sided performance requirement of user to battery can be met; Multiple different pole piece can be combined into pole group additionally by lamination provided by the invention or winding method, its preparation method is simple, and process operability is strong, is applicable to large-scale production application.
Description
Technical field
The present invention relates to technical field, particularly relate to lithium ion battery of a kind of excellent combination property and preparation method thereof.
Background technology
Lithium ion battery has the incomparable advantage of other energy-storage batteries such as energy density is high, quality is light, security performance is good, be successfully applied in various electronic product, communication apparatus, automation instrument and various electric tool, electric bicycle, electric automobile have also been obtained and apply widely, also temptation is had for military fields such as space flight, aviation, field operations.
The performance of lithium ion battery is very big by the impact of electrode material, formula and manufacture craft, such as the most ripe at present lithium cobaltate cathode material, its different pattern, particle diameter, doped chemical kind and doping determine the different performance characteristic of battery, comprise chargeable range, energy density, high rate performance, security performance etc.Equally, the difference of negative material is on the impact of battery performance also highly significant.Carbon anode such as owing to adopting different raw material and preparation technology to obtain, is divided into again Delanium, modifying natural graphite material, carbonaceous mesophase spherules, hard carbon, soft carbon etc., obtained battery product also different properties.
Thus, the battery obtaining a excellent combination property is difficult at present.Even if in the field of ripe application, performance of lithium ion battery also still shows slightly not enough, cannot embody absolute advantage to replace other battery systems; Then cannot be competent at the lithium ion battery of the current technology of some special application fields at all.
Therefore, at present in the urgent need to finding a kind of method, can comprehensive various electrode material, system advantage.Develop a kind of lithium ion battery of excellent combination property.
Summary of the invention
The object of the invention is the technological deficiency for existing in prior art, and lithium ion battery of a kind of excellent combination property and preparation method thereof is provided.
The technical scheme adopted for realizing object of the present invention is: a kind of lithium ion battery of excellent combination property, it is characterized in that comprising the pole group, barrier film, nonaqueous electrolytic solution, lug and the shell that are made up of positive plate and negative plate; Described positive plate comprises positive active material, conductive agent, binding agent and collector; Described negative plate comprises negative electrode active material, conductive agent, binding agent and collector; Described negative plate divides for the negative plate A and negative plate B that are made up of two kinds of different negative electrode active materials; Described positive plate and described negative plate A successively lamination or winding consist of pole group unit A, and described positive plate and described negative plate B successively lamination or winding consist of pole group unit B; Described pole group is made up of with in parallel superposition of described pole group unit B described pole group unit A.
Preferably, the Capacity Ratio of described negative plate and described positive plate is 1 ~ 1.2:1, and its object is in order to reach many-sided index requests such as battery capacity, size, electrical property, security performances simultaneously, and with positive pole limit capacity, negative pole is excessive is design principle.
Described negative electrode active material is one or more mixture of Delanium, native graphite, hard carbon, lithium titanate, metallic silicon, silica.
Preferably, the negative electrode active material of described negative plate A is mass ratio is the Delanium of 87:8 and the mixture of metallic silicon
Preferably, the negative electrode active material of described negative plate B is hard carbon.
The preparation method of the lithium ion battery of above-mentioned a kind of excellent combination property, is characterized in that comprising the following steps:
(1) positive plate is made;
(2) negative electrode active material that use two kinds is different is made into negative plate A and negative plate B respectively;
(3) by positive plate and negative plate A, lamination or winding consist of pole group unit A successively; By positive plate and negative plate B, lamination or winding consist of pole group unit B successively;
(4) pole group unit A step (3) made and pole group unit B parallel connection superposition become pole group;
(5) the pole group that step (4) is made is carried out tab welding, and be placed in battery case, packaging technology encapsulation routinely, liquid seals after entering electrolyte, thus makes lithium ion battery.
Negative electrode active material in described step (2) is one or more mixture of Delanium, native graphite, hard carbon, lithium titanate, metallic silicon, silica.
Preferably, the negative plate A in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate A is mass ratio is the Delanium of 87:8 and the mixture of metallic silicon, and described conductive agent is conductive carbon black, carboxymethyl cellulose (CMC) and the styrene-butadiene latex (SBR) of described binding agent to be weight ratio be 1:2; The weight ratio of described Delanium, metallic silicon, conductive carbon black, carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR) is 87:8:2:1:2; Described collector is the Copper Foil that 10um is thick.
Negative plate B in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate B is hard carbon; Described bonding agent is Kynoar (PVDF), and the weight ratio of hard carbon and Kynoar (PVDF) is 97:3; Described collector is the Copper Foil that 10um is thick.
Compared with prior art, the invention has the beneficial effects as follows: positive and negative plate is comprised one or more Different electrodes, comprise active material difference, according to the active material of pole piece, the specification of conductive agent or binding agent, kind, composition are arranged in pairs or groups simultaneously, adjust the coated weight of electrode simultaneously, make lithium ion battery provided by the invention combine the material of various electrode, the advantage of formula and manufacture craft etc., excellent combination property, the many-sided performance requirement of user to battery can be met; Multiple different pole piece can be combined into pole group additionally by lamination provided by the invention or winding method, its preparation method is simple, and process operability is strong, is applicable to large-scale production application.
Accompanying drawing explanation
Fig. 1 is the manufacturing process schematic diagram of a kind of lithium ion battery that the embodiment of the present invention provides;
Fig. 2 is that 1#, 2#, 3# battery carries out 20 amperes of (being called for short A) constant-current discharge curves;
Fig. 3 is after 1#, 2#, 3# battery shelves 4 hours under-30 DEG C of conditions, then adopts following electric discharge standard to discharge: 22.5A constant-current discharge 30 seconds, then with 4A constant-current discharge until voltage drop is low to moderate the curve that 2.0V obtains.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of lithium ion battery of excellent combination property involved by the present invention, comprises the pole group, barrier film, nonaqueous electrolytic solution, lug and the shell that are made up of positive plate and negative plate.
Described positive plate comprises positive active material, conductive agent, binding agent and collector; Described positive active material comprises the material that cobalt acid lithium, LiMn2O4, LiFePO4, lithium nickelate, Co-Ni-Mn ternary material etc. can be used as active substance of lithium ion battery anode, and the mixed system of wherein two or more materials.
Described negative plate comprises negative electrode active material, conductive agent, binding agent and collector; Described negative electrode active material is one or more mixture of Delanium, native graphite, hard carbon, lithium titanate, metallic silicon, silica.Described negative plate divides for the negative plate A and negative plate B that are made up of two kinds of different negative electrode active materials; Described positive plate and described negative plate A successively lamination or winding consist of pole group unit A, and described positive plate and described negative plate B successively lamination or winding consist of pole group unit B; Described pole group is made up of with in parallel superposition of described pole group unit B described pole group unit A.
Above-mentioned lamination operation refers to carry out differentiation numbering by the positive plate of different system or negative plate, according to the positive pole of designing requirement superposition respective numbers and negative pole during lamination, to reach the capacity of default battery, its size and performance meet customer requirement.
Above-mentioned operating winding is by the positive and negative plate membranes apart of design coupling, is wound into a pole group unit; By the pole group that the pole group unit of different system winding adopts the method parallel connection formation one such as welding or riveted joint final.
Preferably, the negative electrode active material of described negative plate A is mass ratio is the Delanium of 87:8 and the mixture of metallic silicon, and both features are height ratio capacity.
Preferably, the negative electrode active material of described negative plate B is hard carbon, and its feature is that hard carbon has excellent large multiplying power discharging property and cryogenic property.
Described binding agent comprises the material that Kynoar (PVDF) and styrene-butadiene latex (SBR), polyethylene glycol oxide (PEO) etc. can be used for lithium ion cell electrode binding agent.
Described shell comprises aluminum hull, box hat and aluminum-plastic packaging film.
Described electrolyte comprises liquid state, gel state electrolyte and all solid state electrolyte.
Overall, the Capacity Ratio of described negative plate and described positive plate is 1 ~ 1.2:1, its object is in order to reach many-sided index requests such as battery capacity, size, electrical property, security performances simultaneously, and with positive pole limit capacity, negative pole is excessive is design principle.
The preparation method of the lithium ion battery of above-mentioned a kind of excellent combination property, comprises the following steps:
(1) positive plate is made;
1) positive active material is fully mixed with conductive agent, add solvent, as 1-METHYLPYRROLIDONE (NMP); Add binding agent, as Kynoar (PVDF), it is fully stirred and obtains anode sizing agent;
2) coating machine is adopted to obtain positive plate by certain coated weight (surface density) coating;
3) adopt roller that positive plate is rolled certain thickness or compacted density;
4) by rolling, rear pole piece is sheared, die-cut, the small pieces that cut into given size;
(2) negative electrode active material that use two kinds is different is made into negative plate A and negative plate B respectively, and the manufacture method of negative plate is:
1) negative electrode active material is fully mixed with conductive agent, add solvent, as 1-METHYLPYRROLIDONE (NMP) or water, add binding agent, as Kynoar (PVDF) or styrene-butadiene latex (SBR), it is fully stirred and obtains cathode size;
2) coating machine is adopted to obtain negative plate by certain coated weight (surface density) coating;
3) adopt roller that negative plate is rolled certain thickness or compacted density;
4) by rolling, rear pole piece is sheared, die-cut, the small pieces that cut into given size.
(3) by positive plate and negative plate A, lamination or winding consist of pole group unit A successively; By positive plate and negative plate B, lamination or winding consist of pole group unit B successively;
1) lamination operation refers to and the positive plate of different system or negative plate is carried out differentiation numbering, and according to the positive pole of designing requirement superposition respective numbers and negative pole during lamination, to reach the capacity of default battery, its size and performance meet customer requirement;
2) operating winding is by the positive and negative plate membranes apart of design coupling, is wound into a pole group unit;
(4) pole group unit A step (3) made and pole group unit B parallel connection superposition become pole group;
(the pole group that step (4) is made is carried out tab welding by 5, and is placed in battery case, and packaging technology encapsulation routinely, liquid seals after entering electrolyte, thus makes lithium ion battery.
Negative electrode active material in described step (2) is one or more mixture of Delanium, native graphite, hard carbon, lithium titanate, metallic silicon, silica.
Preferably, the negative plate A in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate A is mass ratio is the Delanium of 87:8 and the mixture of metallic silicon, and described conductive agent is conductive carbon black, carboxymethyl cellulose (CMC) and the styrene-butadiene latex (SBR) of described binding agent to be weight ratio be 1:2; The weight ratio of described Delanium, metallic silicon, conductive carbon black, carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR) is 87:8:2:1:2; Described collector is the Copper Foil that 10um is thick.
Negative plate B in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; Described negative electrode active material is hard carbon; Described bonding agent is Kynoar (PVDF), and the weight ratio of hard carbon and Kynoar (PVDF) is 97:3; Described collector is the Copper Foil that 10um is thick.
Be illustrated in figure 1 the manufacturing process of a kind of lithium ion battery provided by the invention, for convenience of explanation, illustrate only the part relevant with the embodiment of the present invention.Stacked pole group structure is adopted to be that example is described in Fig. 1, its external form is square, and shell adopts aluminum plastic film to carry out flexible package, comprises negative plate 2-A, 2-B of positive plate 1 system different from two kind, wrapped up by negative plate 2-A barrier film 3-A, negative plate 2-B barrier film 3-B wraps up; By designing requirement, corresponding number of plies positive plate 1 and negative plate 2-A successively lamination are obtained pole group unit A, by designing requirement, corresponding number of plies positive plate 1 and negative plate 2-B successively lamination are obtained pole group unit B, pole group unit A and B parallel connection being superimposed obtains pole group 4; Negative electrode lug paper tinsel 5, anode ear paper tinsel 6 respectively with containing PUR negative electrode lug 7, weld together containing PUR anode ear 8, the pole group 4 of soldering polar ear 7,8 is positioned in outer packing shell 9, through encapsulation, fluid injection, the operation such as changes into and process and obtain lithium ion battery 10.
The superiority of technical scheme of the present invention is described below by specific embodiment.
Embodiment:
A kind of lithium ion battery of excellent combination property, employing can 4.35V high-voltage charge cobalt acid lithium material be positive pole, anode formula is cobalt acid lithium: conductive carbon black: Kynoar (PVDF)=95:2:3(weight ratio), adopt 15um thick aluminum foil as collector, electrode coated weight is 39mg/cm
2, rolling density is 4.0cm/cm
3, pole piece is sheared and is of a size of the wide * 120mm length of 60mm, and lug paper tinsel is of a size of: the wide * 12mm of 12mm is long.Carry out vacuum drying to positive plate, drying parameter is 100 DEG C, 12h.
Negative pole adopts the Delanium of height ratio capacity and metallic silicon mixing to make electrode A as active material, electrode formulation is C:Si: conductive carbon black: carboxymethyl cellulose (CMC): styrene-butadiene latex (SBR)=87:8:2:1:2(weight ratio), adopt the thick Copper Foil of 10um as collector, electrode coated weight is 7.5mg/cm
2, rolling density is 1.7cm/cm
3, pole piece is sheared and is of a size of the wide * 122mm length of 62mm, and lug paper tinsel is of a size of: the wide * 12mm of 12mm is long.Anticathode sheet carries out vacuum drying, and drying parameter is 130 DEG C, 12h.
Adopt hard carbon to be that active material makes electrode B, electrode formulation is hard carbon: Kynoar (PVDF)=97:3(weight ratio), adopt the thick Copper Foil of 10um as collector, electrode coated weight is 7mg/cm
2, rolling density is 1.0cm/cm
3, pole piece is sheared and is of a size of the wide * 122mm length of 62mm, and lug paper tinsel is of a size of: the wide * 12mm of 12mm is long.Anticathode sheet carries out vacuum drying, and drying parameter is 130 DEG C, 12h.
PP barrier film is cut into 130mm wide * 128mm lengthy motion picture shape, after the doubling of 130mm direction, negative plate is enclosed in diaphragm bag between two parties.10 positive plates are intersected with 11 negative plate A and superposes between two parties, obtain pole group 1#; 10 positive plates are intersected with 11 negative plate B and superposes between two parties, obtain pole group 2#.5 negative plate A are intersected with 5 positive plates and superposes between two parties, then 5 positive plates are intersected with 6 negative plate B superpose between two parties, obtain pole group 3#.
Adopt the thick aluminum plastic film of 110um respectively to obtained 1#, 2#, 3# pole group encapsulates, same electrolyte is injected after vacuum drying, electrolysis formula is lithium hexafluoro phosphate (LiPF6): ethylene carbonate (EC): methyl ethyl carbonate (EMC): ethyl propionate (EP): fluorinated ethylene carbonate (FEC): propylene sulfite (PS): acetonitrile (AN)=16:30:25:21:5:2:1, reservoir quantity is 8 ~ 8.5g, carry out vacuum respectively to battery once to seal, and then adopt 0.4 ampere of (being called for short A) current charges to 4.35V, 4.35V constant voltage charge to electric current stops charging when being reduced to 0.2 ampere (being called for short A), leave standstill after 24 hours, vacuum degassing sealing is carried out to battery.Shelve 7 days under normal temperature condition after, after rejecting defective products, more respectively following test event is carried out to 1#, 2#, 3# non-defective unit battery:
(1) charge to 4.35V with 2A, when 4.35V constant voltage charge to electric current is reduced to 0.2A, stop charging, obtain battery capacity with 2A electric discharge;
(2) precision is adopted to be that the electronic balance of 0.01g carries out battery and weighs;
(3) following standard is adopted to discharge to battery: 20A constant-current discharge is until voltage drop is low to moderate 2.0V;
(4) after battery being shelved 4 hours under-30 DEG C of conditions, following electric discharge standard is adopted to discharge: 22.5A constant-current discharge 30 seconds, then with 4A constant-current discharge until voltage drop is low to moderate 2.0V.
Table 1 is the capacity of 1#, 2#, 3# battery, weight and specific energy correction data;
Table 1
Table 2 carries out 20A constant-current discharge correction data for 1#, 2#, 3# battery;
| Battery is numbered | 1# | 2# | 3# |
| 20A discharge capacity Ah | 1.78 | 3.39 | 3.44 |
| 20A discharge voltage plateau V | 3.2 | 3.63 | 3.54 |
Table 2
Table 3 is after 1#, 2#, 3# battery shelves 4 hours under-30 DEG C of conditions, then adopts following electric discharge standard to discharge: 22.5A constant-current discharge 30 seconds, then with 4A constant-current discharge until voltage drop is low to moderate the correction data that 2.0V obtains.
Table 3
Fig. 2 is that 1#, 2#, 3# battery carries out 5C constant-current discharge curve;
Fig. 3 is after 1#, 2#, 3# battery shelves 4 hours under-30 DEG C of conditions, then adopts following electric discharge standard to discharge: 22.5A constant-current discharge 30 seconds, then with 4A constant-current discharge until voltage drop is low to moderate the curve that 2.0V obtains.
Can be found out by above test result, lithium ion battery 3# prepared by the embodiment of the present invention have employed Delanium water-based system negative plate and the power-performance of high-energy-density simultaneously, the hard carbon oleaginous system negative plate of low temperature performance excellent, compare simple battery 1# and 2# adopting Delanium and hard carbon to obtain, it combines the advantage of two kinds of negative material systems, not only obtain the large high rate performance of hard carbon material system, and energy density improves greatly, add the electrolyte of low temperature and power-performance excellence, 20 amperes of (about 5C multiplying power) discharge performances of battery and low temperature large multiplying power pulse behaviors are obtained for significant raising.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. a lithium ion battery for excellent combination property, is characterized in that: comprise the pole group, barrier film, nonaqueous electrolytic solution, lug and the shell that are made up of positive plate and negative plate; Described positive plate comprises positive active material, conductive agent, binding agent and collector; Described negative plate comprises negative electrode active material, conductive agent, binding agent and collector; Described negative plate divides for the negative plate A and negative plate B that are made up of two kinds of different negative electrode active materials; Described positive plate and described negative plate A successively lamination or winding consist of pole group unit A, and described positive plate and described negative plate B successively lamination or winding consist of pole group described in the group unit B of pole and be made up of with in parallel superposition of described pole group unit B described pole group unit A;
Described negative plate A comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate A is mass ratio is the Delanium of 87: 8 and the mixture of metallic silicon, described conductive agent is conductive carbon black, described binding agent to be weight ratio be 1: 2 carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR); The weight ratio of described Delanium, metallic silicon, conductive carbon black, carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR) is 87: 8: 2: 1: 2; Described collector is the Copper Foil that 10um is thick;
Described negative plate B comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate B is hard carbon; Described binding agent is Kynoar (PVDF), and the weight ratio of hard carbon and Kynoar (PVDF) is 97: 3; Described collector is the Copper Foil that 10um is thick.
2. the preparation method of the lithium ion battery of a kind of excellent combination property according to claim 1, is characterized in that comprising the following steps:
(1) positive plate is made;
(2) negative electrode active material that use two kinds is different is made into negative plate A and negative plate B respectively;
(3) by positive plate and negative plate A, lamination or winding consist of pole group unit A successively; By positive plate and negative plate B, lamination or winding consist of pole group unit B successively;
(4) pole group unit A step (3) made and pole group unit B parallel connection superposition become pole group;
(5) the pole group that step (4) is made is carried out tab welding, and be placed in battery case, packaging technology encapsulation routinely, liquid seals after entering electrolyte, thus makes lithium ion battery;
Negative plate A in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate A is mass ratio is the Delanium of 87: 8 and the mixture of metallic silicon, described conductive agent is conductive carbon black, described binding agent to be weight ratio be 1: 2 carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR); The weight ratio of described Delanium, metallic silicon, conductive carbon black, carboxymethyl cellulose (CMC) and styrene-butadiene latex (SBR) is 87: 8: 2: 1: 2; Described collector is the Copper Foil that 10um is thick;
Negative plate B in described step (2) comprises negative electrode active material, conductive agent, binding agent and collector; The negative electrode active material of described negative plate B is hard carbon; Described binding agent is Kynoar (PVDF), and the weight ratio of hard carbon and Kynoar (PVDF) is 97: 3; Described collector is the Copper Foil that 10um is thick.
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| CN110474024A (en) * | 2018-05-09 | 2019-11-19 | 南京乐金化学新能源电池有限公司 | A kind of lithium titanate battery material |
| CN109686908A (en) * | 2018-11-16 | 2019-04-26 | 华为技术有限公司 | Battery isolation film, battery core, lithium ion battery and preparation method |
| CN113690479B (en) * | 2020-05-19 | 2024-01-30 | 北京小米移动软件有限公司 | Rechargeable battery and electronic device |
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| CN109616695A (en) * | 2018-10-19 | 2019-04-12 | 安徽正熹标王新能源有限公司 | A kind of manufacturing method of lithium ion battery and lithium ion battery |
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