CN103367714B - Graphite cathode pole piece for lithium ion battery and manufacture method thereof - Google Patents
Graphite cathode pole piece for lithium ion battery and manufacture method thereof Download PDFInfo
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- CN103367714B CN103367714B CN201310285125.9A CN201310285125A CN103367714B CN 103367714 B CN103367714 B CN 103367714B CN 201310285125 A CN201310285125 A CN 201310285125A CN 103367714 B CN103367714 B CN 103367714B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a graphite cathode pole piece for a lithium ion battery and a manufacture method thereof. The manufacture method of the graphite cathode pole piece comprises the following steps of: providing the graphite cathode pole piece, wherein the graphite cathode pole piece comprises a cathode current collector and a cathode membrane which is closely formed onto the cathode current collector and contains an active material graphite; processing the graphite cathode pole piece by a high-oxidability mist spray box; enabling the graphite cathode pole piece processed by the high-oxidability mist spray box to pass through a high-temperature and high-humidity box; enabling the treated-graphite cathode pole piece processed in high temperature and high humidity to pass through a vacuum box body; processing the vacuumized-graphite cathode pole piece by a lithium carbonate mist spray box; processing the cathode pole piece subjected to the processing of the lithium carbonate mist spray box by a blasting high-temperature and high-humidity box; and drying the graphite cathode pole piece processed by the blasting high-temperature and high-humidity box by an oven. The graphite cathode pole piece for the lithium ion battery is manufactured by the manufacture method. Therefore, the low-temperature and high-multiplying power cycle performance of the lithium ion battery which adopts the high-energy density graphite cathode pole piece can be improved.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of lithium ion battery graphite cathode pole piece and preparation method thereof.
Background technology
Along with the progress of science and technology, the application of mobile device is more and more extensive.Due to the quick growth of mobile device, therefore wilderness demand is formed to high energy density cells.
Current business-like negative active core-shell material is based on graphite, and the method improving its energy density mainly contains and improves degree of graphitization to increase the position of Lithium-ion embeding and to improve the compacted density of cathode pole piece.The increase of degree of graphitization can reduce the interlamellar spacing of graphite, the polarization increase problem causing lithium ion to embed in cathode pole piece and deviate from.The too high meeting of compacted density of cathode pole piece makes cathode pole piece hole reduce, and greatly reduces the absorbability of cathode pole piece to electrolyte, adds the polarization of lithium ion battery in low temperature and high rate charge-discharge process.
The technique of high compacted density is improved in the industry, the Chinese patent application publication number CN102195029A announced on 06 09th, 2011 discloses a kind of lithium ion battery and cathode pole piece thereof, it adopts composite graphite layer process, but this technique is also reduction of the energy density of lithium ion battery to a certain extent.
Summary of the invention
In view of background technology Problems existing, the object of the present invention is to provide a kind of lithium ion battery graphite cathode pole piece and preparation method thereof, it can improve the low temperature of the lithium ion battery adopting high-energy-density graphite cathode pole piece and large circulation performance.
To achieve these goals, in a first aspect of the present invention, the invention provides a kind of preparation method of lithium ion battery graphite cathode pole piece, it comprises step: provide graphite cathode pole piece, and described graphite cathode pole piece comprises negative current collector and to be closely knitly formed on described negative current collector and cathode membrane containing active material graphite; Graphite cathode pole piece is processed through strong oxidizing property spray tank, there is in strong oxidizing property spray tank the H sprayed into
2sO
4, the strong oxidizing property that formed of strong oxidizer hydrogen peroxide and liquor potassic permanganate sprays; Make the graphite cathode pole piece after the process of strong oxidizing property spray tank through humidity be 40% ~ 80%, temperature is the hot and humid case of 80 ~ 100 DEG C; Make the graphite cathode pole piece after hot and humid process through the vacuum chamber of vacuum degree at-85Mpa ~-95Mpa; Graphite cathode pole piece after vacuumizing process is processed through lithium carbonate spray tank, there is in lithium carbonate spray tank the lithium carbonate spraying formed by the Lithium carbonate solution sprayed into; Make the graphite cathode pole piece after the process of lithium carbonate spray tank through excess temperature be 80 ~ 100 DEG C, humidity processes at the hot and humid case of air blast of 60% ~ 80%; And the graphite cathode pole piece after the hot and humid case process of air blast is dried through baking oven, oven temperature is 80 ~ 120 DEG C.
In a second aspect of the present invention, the invention provides a kind of lithium ion battery graphite cathode pole piece, it is obtained by the preparation method of lithium ion battery graphite cathode pole piece described according to a first aspect of the present invention.
Beneficial effect of the present invention is as follows:
By the process of strong oxidizing property spray tank and hot and humid case, graphite cathode pole piece carries out roughening and expansionization process, the de-lithium of the lithium ion battery of the rear graphite cathode pole piece assembling of process, embedding lithium speed and electrolyte wetting capacity are greatly improved, and are conducive to improving the low temperature of lithium ion battery and large circulation performance.
Embodiment
The following detailed description of lithium ion battery graphite cathode pole piece according to the present invention and preparation method thereof and embodiment.
First the preparation method of lithium ion battery graphite cathode pole piece is according to a first aspect of the present invention described.
Preparation method according to lithium ion battery graphite cathode pole piece of the present invention comprises step: provide graphite cathode pole piece, and described graphite cathode pole piece comprises negative current collector and to be closely knitly formed on described negative current collector and cathode membrane containing active material graphite; Graphite cathode pole piece is processed through strong oxidizing property spray tank, there is in strong oxidizing property spray tank the H sprayed into
2sO
4, the strong oxidizing property that formed of strong oxidizer hydrogen peroxide and liquor potassic permanganate sprays; Make the graphite cathode pole piece after the process of strong oxidizing property spray tank through humidity be 40% ~ 80%, temperature is the hot and humid case of 80 ~ 100 DEG C; Make the graphite cathode pole piece after hot and humid process through the vacuum chamber of vacuum degree at-85Mpa ~-95Mpa; Graphite cathode pole piece after vacuumizing process is processed through lithium carbonate spray tank, there is in lithium carbonate spray tank the lithium carbonate spraying formed by the Lithium carbonate solution sprayed into; Make the graphite cathode pole piece after the process of lithium carbonate spray tank through excess temperature be 80 ~ 100 DEG C, humidity processes at the hot and humid case of air blast of 60% ~ 80%; And the graphite cathode pole piece after the hot and humid case process of air blast is dried through baking oven, oven temperature is 80 ~ 120 DEG C.
Graphite cathode pole piece is when strong oxidizing property spray tank processes, and strong oxidizing property spraying is corroded the surface of graphite in the cathode membrane of graphite cathode pole piece and becomes coarse and the group making the graphite surface band of erosion oxidizing.Roughening improves the infiltration of electrolyte on cathode pole piece, thus reduces the risk that anode surface analyses lithium, significantly improves the large multiplying power of lithium ion battery and low-temperature circulating performance.
Graphite cathode pole piece after the process of strong oxidizing property spray tank is when hot and humid case processes, the high humility of hot and humid case makes the graphite linings in the cathode membrane of the graphite cathode pole piece after with the process of strong oxidizing property spray tank move, thus the interlamellar spacing of graphite is increased, the diffusion coefficient of lithium ion in superficial layer graphite is significantly improved, is conducive to reducing the polarization of lithium ion battery on large multiplying power or low temperature charging process Anodic surface.In addition, high humility is high is conducive to the pliability increasing diaphragm, and when therefore high humility prevents oxide group from departing from, cathode membrane occurs brittle, and high humility is conducive to diluting residual strong oxidizing property spraying simultaneously.
The condition of high vacuum degree of vacuum chamber make graphite surface with oxide group can depart from.
Graphite cathode pole piece after hot and humid case process is when lithium carbonate spray tank processes, graphite cathode pole piece is carried out the dilution process of finishing and the spraying of residual strong oxidizing property further, lithium carbonate main purpose carries out neutralisation treatment to the sulfuric acid in residual strong oxidizing property spraying, do not cause impurity to disturb to graphite cathode pole piece simultaneously.In addition, a small amount of lithium carbonate remained on graphite cathode pole piece can as anode film for additive.
Graphite cathode pole piece after the process of lithium carbonate spray tank is when the hot and humid case of air blast processes, and graphite cathode pole piece is carried out the dilution process of strong oxidizer and lithium carbonate further, and the object of air blast blows away residual strong oxidizer and lithium carbonate in time.
According in the preparation method of lithium ion battery graphite cathode pole piece of the present invention, preferably, H
2sO
4, strong oxidizer hydrogen peroxide and liquor potassic permanganate concentration be 0.8 ~ 1.2M, sulfuric acid: hydrogen peroxide: mass ratio=1:(0.2 ~ 5 of potassium permanganate): (0.01 ~ 0.1); The strong oxidizing property concentration be sprayed in described strong oxidizing property spray tank is 0.01 ~ 5kg/cm
3; The temperature of strong oxidizing property spray tank is 60 ~ 90 DEG C; Graphite cathode pole piece is 10 ~ 30min through the time of strong oxidizing property spray tank.
According in the preparation method of lithium ion battery graphite cathode pole piece of the present invention, preferably, the time of staying of the graphite cathode pole piece after the process of strong oxidizing property spray tank in hot and humid case is 10min ~ 2h.
According in the preparation method of lithium ion battery graphite cathode pole piece of the present invention, preferably, the time of staying of the graphite cathode pole piece after hot and humid case process in vacuum chamber is 30min ~ 2h.
In order to the cementability of the effect and cathode membrane that ensure neutralisation of sulphuric acid, preferably, the concentration of Lithium carbonate solution is 0.1M ~ 1M, and the concentration of lithium carbonate spraying is 0.1 ~ 8kg/cm
3; Graphite cathode pole piece is 0.5 ~ 2h through the time of lithium carbonate spray tank.
According in the preparation method of lithium ion battery graphite cathode pole piece of the present invention, preferably, graphite cathode pole piece is 20min ~ 2h through the time of the hot and humid case of air blast.
According in the preparation method of lithium ion battery graphite cathode pole piece of the present invention, provide graphite cathode pole piece to be coated on by cathode size on negative current collector again by active material graphite, conductive agent, binding agent, solvent being made cathode size, dry compacting after obtain.In other words graphite cathode pole piece is provided for directly to prepare, can certainly to adopt graphite cathode pole piece that is that obtained or that be purchased.
Secondly lithium ion battery graphite cathode pole piece is according to a second aspect of the present invention described, it is obtained by the preparation method of lithium ion battery graphite cathode pole piece described according to a first aspect of the present invention.
Comparative example, embodiment and test result according to lithium ion battery graphite cathode pole piece of the present invention and preparation method thereof is finally described.
Comparative example 1
Prepare lithium ion battery negative electrode: (MAGE is a kind of business-like high power capacity, high densification Delanium by MAGE graphite; Specific capacity is 360mAh/g), conductive carbon powder, styrene-butadiene latex (SBR), carboxymethyl cellulose (CMC) in mass ratio=96:1.5:1.5:1.0 joins deionized water for stirring and evenly makes cathode membrane slurry; Be uniformly coated on negative current collector Copper Foil by obtained cathode membrane slurry, coating weight is 9.87mg/cm
2, obtained lithium ion battery negative electrode after drying compacting, compacted density is 1.7g/cm
3.
Prepare anode slice of lithium ion battery: by LiCoO
2, conductive carbon powder, polyvinylidene fluoride (PVDF) in mass ratio=95:2:3 joins in 1-METHYLPYRROLIDONE (NMP) to mix and stir and makes positive pole diaphragm slurry; Obtained positive pole diaphragm slurry is uniformly coated on plus plate current-collecting body aluminium foil, obtained anode slice of lithium ion battery after drying compacting.
Prepare lithium ion battery separator: take microporous polypropylene membrane as barrier film.
Prepare lithium-ion battery electrolytes: electrolyte take concentration as the lithium hexafluoro phosphate (LiPF of 1M
6) be lithium salts, be non-aqueous organic solvent (wherein mass ratio is for EC:DMC:EMC=3:4:3) with the mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC), then add the additive containing 3wt% fluorinated ethylene carbonate (FEC) and 1wt% vinylene carbonate.
Prepare lithium ion battery: after the lithium ion battery negative electrode of preparation, anode pole piece and barrier film being superposed successively, obtain lithium ion battery cell by winding process, lithium ion battery cell is loaded in housing, injecting the lithium-ion battery electrolytes of preparation, sealing, completing the preparation of lithium ion battery through changing into, after the operation such as capacity.
Comparative example 2
Prepare lithium ion battery negative electrode: by MAGE graphite (specific capacity is 360mAh/g), conductive carbon powder, styrene-butadiene latex (SBR), carboxymethyl cellulose sodium (CMC) in mass ratio=96:1.5:1.5:1.0 joins deionized water for stirring and evenly makes cathode membrane slurry; Be uniformly coated on negative current collector Copper Foil by obtained cathode membrane slurry, coating weight is 9.87mg/cm
2, obtained lithium ion battery negative electrode after drying compacting, compacted density is 1.8g/cm
3.
Prepare anode slice of lithium ion battery: with comparative example 1.
Prepare lithium ion battery separator: with comparative example 1.
Prepare lithium-ion battery electrolytes: with comparative example 1.
Prepare lithium ion battery: with comparative example 1.
Comparative example 3
Prepare lithium ion battery negative electrode: by negative electrode active material FSNC graphite (gram volume: 340mAh/g), conductive carbon powder, styrene-butadiene latex (SBR), carboxymethyl cellulose sodium (CMC) in mass ratio=96:1.5:1.5:1.0 joins deionized water for stirring and evenly makes cathode membrane slurry; Be uniformly coated on negative current collector Copper Foil by obtained cathode membrane slurry, coating weight is 9.87mg/cm
2, obtained lithium ion battery negative electrode after drying compacting, compacted density is 1.5g/cm
3.
Prepare anode slice of lithium ion battery: with comparative example 1.
Prepare lithium ion battery separator: with comparative example 1.
Prepare lithium-ion battery electrolytes: with comparative example 1.
Prepare lithium ion battery: with comparative example 1.
Comparative example 4
Prepare lithium ion battery negative electrode: by negative electrode active material MAGE graphite, conductive carbon powder, styrene-butadiene latex (SBR), carboxymethyl cellulose sodium (CMC) in mass ratio=96:1.5:1.5:1.0 joins deionized water for stirring and evenly makes cathode membrane slurry; Be uniformly coated on negative current collector Copper Foil by obtained cathode membrane slurry, coating weight is 4.94mg/cm
2, obtained lithium ion battery negative electrode after drying compacting, compacted density is 1.7g/cm
3;
Using above-mentioned cathode pole piece as being bottom diaphragm, at the cathode membrane slurry that the above-mentioned bottom diaphragm of pole piece spraying preparation is identical, controlling its coating weight is 4.93mg/cm
2, after drying compacting, obtained compacted density is 1.5g/cm
3top layer diaphragm;
By said method, obtained to have compacted density be 1.5g/cm
3top layer diaphragm, compacted density is 1.7g/cm
3the lithium ion battery negative electrode that forms of bottom diaphragm.
Prepare anode slice of lithium ion battery: with comparative example 1.
Prepare lithium ion battery separator: with comparative example 1.
Prepare lithium-ion battery electrolytes: with comparative example 1.
Prepare lithium ion battery: with comparative example 1.
Embodiment 1
Prepare lithium ion battery negative electrode: be handled as follows by the lithium ion battery negative electrode of preparation in comparative example 1:
Make the lithium ion battery negative electrode (referred to here as graphite cathode pole piece) of preparation in comparative example 1 through having by the 1M H sprayed into
2sO
4, the strong oxidizing property that formed of strong oxidizer hydrogen peroxide and liquor potassic permanganate (sulfuric acid: hydrogen peroxide: the mass ratio=1:0.5:0.05 of potassium permanganate) the strong oxidizing property spray tank of spraying processes, wherein in strong oxidizing property case, strong oxidizing property spray concentration is 0.08kg/cm
3, strong oxidizing property case temperature be 80 DEG C, be 25min through the time of strong oxidizing property spray tank;
Make the graphite cathode pole piece after the process of strong oxidizing property spray tank through humidity be 60%, temperature is that the hot and humid case of 80 DEG C processes, the processing time is 1h;
Graphite cathode pole piece after high temperature, high humidity treatment is processed through the vacuum chamber that vacuum degree is-90Mpa, and the processing time is 1h;
The lithium carbonate spray tank graphite cathode pole piece after vacuumizing process is passed through by the concentration sprayed into the lithium carbonate spraying that the Lithium carbonate solution being 1M is formed processes, processing time is 1.5h, and in lithium carbonate spray tank, the concentration of lithium carbonate spraying is 0.5kg/cm
3;
Make the graphite cathode pole piece after the process of lithium carbonate spray tank through excess temperature be 100 DEG C, humidity be 80% the hot and humid case of air blast process, the elapsed time is 30min;
Graphite cathode pole piece after the hot and humid case process of air blast is dried through baking oven, and the temperature of baking oven is 120 DEG C.
Prepare anode slice of lithium ion battery: with comparative example 1.
Prepare lithium ion battery separator: with comparative example 1.
Prepare lithium-ion battery electrolytes: with comparative example 1.
Prepare lithium ion battery: with comparative example 1.
Embodiment 2
Prepare lithium ion battery negative electrode: be handled as follows by the lithium ion battery negative electrode of preparation in comparative example 2:
Make the lithium ion battery negative electrode (referred to here as graphite cathode pole piece) of preparation in comparative example 2 through having by the 1M H sprayed into
2sO
4, the strong oxidizing property that formed of strong oxidizer hydrogen peroxide and liquor potassic permanganate (sulfuric acid: hydrogen peroxide: the mass ratio=1:0.5:0.05 of potassium permanganate) the strong oxidizing property spray tank of spraying processes, wherein in strong oxidizing property case, strong oxidizing property spray concentration is 0.08kg/cm
3, strong oxidizing property case temperature be 80 DEG C, be 25min through the time of strong oxidizing property spray tank;
Make the graphite cathode pole piece after the process of strong oxidizing property spray tank be 60% through humidity, temperature is that the hot and humid case of 100 DEG C processes, and the processing time is 2h;
Graphite cathode pole piece after high temperature, high humidity treatment is processed through the vacuum chamber that vacuum degree is-90Mpa, and the processing time is 2h;
The lithium carbonate spray tank graphite cathode pole piece after vacuumizing process is passed through by the concentration sprayed into the lithium carbonate spraying that the Lithium carbonate solution being 1M is formed processes, processing time is 1.5h, and in lithium carbonate spray tank, the concentration of lithium carbonate spraying is 0.5kg/cm
3;
Make the graphite cathode pole piece after the process of lithium carbonate spray tank through excess temperature be 100 DEG C, humidity be 80% the hot and humid case of air blast process, the elapsed time is 30min;
Graphite cathode pole piece after the hot and humid case process of air blast is dried through baking oven, and the temperature of baking oven is 120 DEG C.
Prepare anode slice of lithium ion battery: with comparative example 1;
Prepare lithium ion battery separator: with comparative example 1;
Prepare lithium-ion battery electrolytes: with comparative example 1;
Prepare lithium ion battery: with comparative example 1.
In above-mentioned comparative example 1-4 and embodiment 1,2, the battery core model of the lithium ion battery of preparation is cylindrical 18650, and positive pole diaphragm coat weight is identical, and ensures the measure-alike of final battery core by the coated length of adjustment anode pole piece and cathode pole piece.
Finally provide the performance of lithium ion battery testing result of comparative example 1-4 and embodiment 1,2.
The lithium ion battery of comparative example 1-4 and embodiment 1,2 is carried out following detection:
(1) lithium ion battery of comparative example 1-4 and embodiment 1,2 is tested RT capacity (i.e. room temperature capacity) under 0.5C;
(2) lithium ion battery of comparative example 1-4 and embodiment 1,2 is carried out RT loop test, wherein charging current is 1C, and discharging current is 1C, its capability retention of test after 800 circulations;
(3) lithium ion battery of comparative example 1-4 and embodiment 1,2 is carried out 10 DEG C of loop tests, wherein charging current is 0.5C, and discharging current is 0.5C, its capability retention of test after 100 circulations;
(4) lithium ion battery of comparative example 1-4 and embodiment 1,2 is carried out 10 DEG C of loop tests, wherein charging current is 0.5C, and discharging current is 0.5C, and that observes anode surface after 30 circulations analyses lithium situation.
Table 1 gives the test result of above-mentioned four performances of the lithium ion battery of comparative example 1-4 and embodiment 1,2.
The performance of lithium ion battery test result of table 1 comparative example 1-4 and embodiment 1,2
As can be seen from Table 1, the lithium ion battery (embodiment 1,2) that the graphite electrode of height ratio capacity, high compacted density is assembled after overexpansion process can reach the multiplying power identical with the lithium ion battery that the graphite electrode of low specific capacity, low tapped density is assembled (comparative example 3) and low-temperature circulating performance.Under identical battery core size, the RT capacity of embodiment 1 is close with comparative example 1, but has apparently higher than comparative example 3 low temperature and large circulation performance that are obviously better than comparative example 1.Under identical battery core size, the RT capacity of embodiment 2 is close with comparative example 2, but has apparently higher than comparative example 3 low temperature and large circulation performance that are obviously better than comparative example 2.Therefore preparation technology is traditionally difficult to improve high power capacity, the large multiplying power of lithium ion battery of high compacted density graphite electrode assembling and low-temperature circulating performance, and according to lithium ion battery prepared by graphite electrode of the present invention, there is higher capacity, there is good large multiplying power and low-temperature circulating performance simultaneously.
Comparative example 4 is compared with comparative example 1, and because the compacted density of comparative example 4 upper strata diaphragm is lower, therefore comparative example 4 is lower than comparative example 1 on capacity, and in circulation and high rate performance, comparative example 4 is slightly better than comparative example 1; But the chemical property of lithium ion battery prepared by the present invention cannot be reached.
Claims (5)
1. a lithium ion battery preparation method for graphite cathode pole piece, comprises step:
There is provided graphite cathode pole piece, described graphite cathode pole piece comprises negative current collector and to be closely knitly formed on described negative current collector and cathode membrane containing active material graphite;
Graphite cathode pole piece is processed through strong oxidizing property spray tank, there is in strong oxidizing property spray tank the H sprayed into
2sO
4, the strong oxidizing property that formed of strong oxidizer hydrogen peroxide and liquor potassic permanganate sprays;
Make the graphite cathode pole piece after the process of strong oxidizing property spray tank through humidity be 40% ~ 80%, temperature is the hot and humid case of 80 ~ 100 DEG C;
Make the graphite cathode pole piece after hot and humid case process through the vacuum chamber of vacuum degree at-85Mpa ~-95Mpa;
Graphite cathode pole piece after vacuumizing process is processed through lithium carbonate spray tank, there is in lithium carbonate spray tank the lithium carbonate spraying formed by the Lithium carbonate solution sprayed into;
Make the graphite cathode pole piece after the process of lithium carbonate spray tank through excess temperature be 80 ~ 100 DEG C of humidity 60% ~ 80% the hot and humid case of air blast process; And
Graphite cathode pole piece after the hot and humid case process of air blast is dried through baking oven, and oven temperature is 80 ~ 120 DEG C;
Graphite cathode pole piece is 10 ~ 30min through the time of strong oxidizing property spray tank;
The time of staying of graphite cathode pole piece after the process of strong oxidizing property spray tank in hot and humid case is 10min ~ 2h;
The time of staying of graphite cathode pole piece after hot and humid case process in vacuum chamber is 30min ~ 2h;
Graphite cathode pole piece is 0.5 ~ 2h through the time of lithium carbonate spray tank;
Graphite cathode pole piece is 20min ~ 2h through the time of the hot and humid case of air blast.
2. the preparation method of lithium ion battery graphite cathode pole piece according to claim 1, is characterized in that,
H
2sO
4concentration be 0.8 ~ 1.2M, H
2sO
4: hydrogen peroxide: mass ratio=1:(0.2 ~ 5 of potassium permanganate): (0.01 ~ 0.1);
The strong oxidizing property concentration be sprayed in described strong oxidizing property spray tank is 0.01 ~ 5kg/cm
3;
The temperature of strong oxidizing property spray tank is 60 ~ 90 DEG C.
3. the preparation method of lithium ion battery graphite cathode pole piece according to claim 1, is characterized in that, the concentration of Lithium carbonate solution is 0.1M ~ 1M, and the concentration of lithium carbonate spraying is 0.1 ~ 8kg/cm
3.
4. the preparation method of lithium ion battery graphite cathode pole piece according to claim 1, it is characterized in that, providing graphite cathode pole piece to be coated on by cathode size on negative current collector again by active material graphite, conductive agent, binding agent, solvent being made cathode size, dry compacting after obtain.
5. a lithium ion battery graphite cathode pole piece, the preparation method of its lithium ion battery graphite cathode pole piece according to any one of claim 1-4 obtains.
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| CN104779366A (en) * | 2015-04-15 | 2015-07-15 | 东莞市创明电池技术有限公司 | Preparation method of lithium ion battery negative plate and lithium battery manufactured by lithium ion battery negative plate |
| CN107785578B (en) | 2016-08-25 | 2019-06-11 | 宁德时代新能源科技股份有限公司 | Positive electrode additive, preparation method thereof, positive plate and lithium ion secondary battery |
| CN110048082B (en) * | 2019-04-03 | 2022-03-04 | 合肥国轩高科动力能源有限公司 | Method for reducing orientation value of graphite negative pole piece of lithium ion battery and pole piece obtained by method |
| CN111584873B (en) * | 2020-05-26 | 2021-09-14 | 大连中比能源科技有限公司 | Modified graphite negative electrode material and preparation method and application thereof |
| CN111987344A (en) * | 2020-10-09 | 2020-11-24 | 昆山宝创新能源科技有限公司 | Quick-charging lithium ion battery |
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| EP1852927A1 (en) * | 2006-05-06 | 2007-11-07 | BIOTRONIK CRM Patent AG | Electrode for a lithium battery and method for manufacturing the same |
| CN101710619A (en) * | 2009-12-14 | 2010-05-19 | 重庆大学 | Electrode plate for lithium ion battery and manufacturing method thereof |
| CN102195029A (en) * | 2011-06-09 | 2011-09-21 | 东莞新能源科技有限公司 | Lithium ion battery and cathode pole sheet thereof |
| CN102694174A (en) * | 2012-06-19 | 2012-09-26 | 上海交通大学 | Activating treatment method for graphite applied to lithium-ion negative pole |
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| JP2010198801A (en) * | 2009-02-23 | 2010-09-09 | Gunze Ltd | Electrode for polymer electrolyte fuel cell, method for manufacturing calcined film of polymer electrolyte fuel cell, method for using electrode of polymer electrolyte fuel cell, and polymer electrolyte fuel cell |
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| EP1852927A1 (en) * | 2006-05-06 | 2007-11-07 | BIOTRONIK CRM Patent AG | Electrode for a lithium battery and method for manufacturing the same |
| CN101710619A (en) * | 2009-12-14 | 2010-05-19 | 重庆大学 | Electrode plate for lithium ion battery and manufacturing method thereof |
| CN102195029A (en) * | 2011-06-09 | 2011-09-21 | 东莞新能源科技有限公司 | Lithium ion battery and cathode pole sheet thereof |
| CN102694174A (en) * | 2012-06-19 | 2012-09-26 | 上海交通大学 | Activating treatment method for graphite applied to lithium-ion negative pole |
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