CN102956886A - Lithium iron phosphate battery and preparation method thereof - Google Patents
Lithium iron phosphate battery and preparation method thereof Download PDFInfo
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- CN102956886A CN102956886A CN2012104317863A CN201210431786A CN102956886A CN 102956886 A CN102956886 A CN 102956886A CN 2012104317863 A CN2012104317863 A CN 2012104317863A CN 201210431786 A CN201210431786 A CN 201210431786A CN 102956886 A CN102956886 A CN 102956886A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention discloses a lithium iron phosphate battery, which comprises a positive electrode active material and a negative electrode active material, wherein raw materials of the positive electrode active material comprise a solid part A and a solvent A, a mass of the solvent A is 0.9-1.5 times a mass of the solid part A, raw materials of the negative electrode active material comprise a solid part B and a solvent B, and a mass of the solvent B is 0.9-1.6 times a mass of the solid part B. The present invention further discloses a lithium iron phosphate battery preparation method, which comprises: preparing a positive electrode active material/a negative electrode active material into mixing slurries, coating the slurries on a current collector through a coater, drying, carrying out heating calendaring through a rolling press to prepare a positive electrode sheet/a negative electrode sheet, carrying out winding or laminating of the positive electrode sheet/the negative electrode sheet and a separation membrane to obtain an electrical core, assembling a plurality of the electrical cores after the plurality of the electrical cores are connected in parallel and in series, connecting the electrical core and battery case terminals or post terminals, and locking to obtain the finished product. The lithium iron phosphate battery has a large current charge and discharge capacity, and has a good low temperature performance, wherein discharge capacity can be more than 75% under a -20 DEG C condition.
Description
Technical field
The present invention relates to the battery manufacture field, relate in particular to a kind of ferric phosphate lithium cell and preparation method thereof.
Background technology
Environmental pollution and energy crisis are two large problems of facing mankind in present and following one period, and a large amount of universal of automobile is the one of the main reasons that causes environment and energy problem.The appearance of hybrid vehicle (HEV) can partly address the above problem, thereby is subject to government, automaker and scientific worker's great attention.The research and development of HEV are actively supported in countries in the world, and battery manufacturer, automaker propose HEV commodity or concept car one after another, have progressively formed the HEV new markets.
Ni-MH battery is the main product of present HEV Battery Market, preferably battery of present combination property mainly due to it, except satisfying the desired high-energy of HEV, high power, long-life and enough the wide operating temperature range, also have inherent overcharging resisting, cross the mechanism of putting, than being easier to carry out the connection in series-parallel combination; Battery capacity is changeable, by 30mAh to 250Ah; High temperature performance preferably; Relatively simple electronic monitoring battery management system.
At present, lithium ion battery is in Improvement and trial period in the HEV field, this be since it have potential advantage, it has than high-energy-density, can make the HEV battery do littlely, lighter; Have preferably efficiency for charge-discharge and low self-discharge rate, can improve the energy efficiency of HEV battery, have larger potential room for price-cut, replacement nickel hydrogen battery gradually.
Lithium ion battery is the most outstanding battery of secondary chemical sources of electric energy performance that so far all commercializations are used, at first, no matter be volumetric specific energy, or gravimetric specific energy, lithium ion battery all exceeds more than three times than lead accumulator, determined that thus the lithium ion battery volume is less, weight is lighter, its market comsupton is felt good; Secondly, lithium ion battery is used for the cycle life of Moped Scooter generally more than 800 times, adopt the lithium ion battery of lithium iron phosphate positive material can reach about 2000 times, exceed 1.5 times of lead accumulators to more than 5 times, this greatly reduces the use cost of lithium ion battery; Again, have the ability of filling soon, when needed, can make the charging interval be controlled at 20～60min, charge efficiency reaches more than 95%.The most important thing is that the multiplying power discharging property of lithium ion battery is good, this characteristic is very beneficial for the development of HEV technology.
Lithium ion battery is different according to positive electrode, and it is multiple to be divided into cobalt acid lithium, LiMn2O4, cobalt nickel LiMn2O4, LiFePO4 etc.Cobalt acid lithium is not suitable for poor stability owing to the cobalt valency is high; LiMn2O4 is compared to LiFePO4, not high aspect fail safe and useful life; In foreseeable future, LiFePO4 will become the main positive electrode of HEV lithium ion battery.
Have some superiority although the performance of ferric phosphate lithium cell is compared with the battery of other type, still can not satisfy the harsh instructions for use of HEV high power charging-discharging.Therefore, find out the in-problem reason of ferric phosphate lithium cell, take the manufacturing technology of correct effective measures improvement ferric phosphate lithium cell, improve the performance of ferric phosphate lithium cell, most important for the HEV industrial expansion.
Summary of the invention
It is high that technical problem to be solved by this invention provides a kind of security performance, and volume is little, ferric phosphate lithium cell that can high power charging-discharging.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is:
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of described positive active material is comprised of solid portion A and solvent orange 2 A, and the mass percent of described solid portion A consists of:
LiFePO4: 88～95%;
Carbon nano-tube: 0.5～6%;
Conductive carbon material: 0.5～3%;
Adhesive: 3～5%;
Described solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 0.9～1.5 times of solid portion A gross mass;
The raw material of described negative electrode active material is comprised of solid portion B and solvent B, and the mass percent of described solid portion B consists of:
Activated carbon material: 90～96%;
Carbon nano-tube: 0.5～4%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～6%;
Described solvent B is deionized water or 1-METHYLPYRROLIDONE, and solvent B quality is 0.9～1.6 times of solid portion B gross mass.
The capacity of battery is determined by the capacity of electrode, and the capacity of electrode and its electrode composition are closely related, and LiFePO4 and activated carbon material are the main active substances of electrode among the present invention, the performance that how much directly affects battery of consumption.With the exception of this, correlative study is found, adds the conductivity that carbon nano-tube can be improved electrode material in the pole piece, under common discharge-rate (being not more than 1C), it is little to the performance impact of battery to add carbon nano-tube, but under the high-multiplying power discharge condition, adding an amount of carbon nano-tube can provide more conductive network, improves the conductivity of material, reduce internal resistance, improve discharge platform, increase the cyclical stability of material, improve the high-rate discharge ability of battery.And it also has the electric double layer effect, the high magnification characteristic of performance ultracapacitor, and the dissipation of heat when its good heat conductivility also helps battery charging and discharging reduces the polarization of battery, improves the high temperature performance of battery, prolongs the useful life of battery.
The present invention has added the performance that a certain amount of carbon nano-tube is improved battery in the both positive and negative polarity active material, and when the content of carbon nano-tube is higher, can suitably reduce the content of conductive carbon material, therefore, as preferably, the mass percent of described solid portion A consists of:
LiFePO4: 90～95%;
Carbon nano-tube: 0.5～2%;
Conductive carbon material: 1～3%;
Adhesive: 3～5%;
The mass percent of described solid portion B consists of:
Activated carbon material: 92～96%;
Carbon nano-tube: 0.5～2%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～6%.
As another kind of optimal way, the mass percent of described solid portion A consists of:
LiFePO4: 88～90%;
Carbon nano-tube: 3～6%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～5%;
The mass percent of described solid portion B consists of:
Activated carbon material: 90～92%;
Carbon nano-tube: 3～4%;
Conductive carbon material: 0.5～1%;
Adhesive: 3～6%.
Positive active material occupies larger proportion (mass ratio of both positive and negative polarity active material is 2: 1～4: 1) in the lithium ion battery, the performance of positive active material directly affects the performance of lithium ion battery, its cost also directly determines the cost height of battery, the present invention selects LiFePO4 as main positive active material, have have extended cycle life, safe, cheap, avirulence, free of contamination advantage, the hybrid vehicle battery of making than other positive electrodes such as LiMn2O4s has higher fail safe and cycle performance.
The main active substances of lithium ion battery negative has the materials such as graphitized carbon material, amorphous carbon material, nitride, silica-base material, novel alloy.The activated carbon material of negative pole adopts graphite material among the present invention, has good layer structure, good conductivity, and degree of crystallinity is higher, more is conducive to taking off/embedding of lithium ion, and described activated carbon material is at least a in Delanium, native graphite, the modified graphite.Described modified graphite refers to take the methods such as non-material with carbon element such as oxide of oxidation, copper facing, coated polymer RESEARCH OF PYROCARBON or tin that graphite is carried out modification at graphite surface, can obviously improve its charge-discharge performance, and can further improve the specific capacity of graphite material, reach real requirement.
Described conduction raw material of wood-charcoal is at least a in graphite agent, the carbon black conductive agent.The characteristics of graphite agent are to be that nanometer or micron-sized particle aggregation become aggregation by diameter, can be distributed to the conductive network that active material forms branched chain on every side, reduce internal resistance, improve electron conduction, in negative pole, it not only can improve the conductivity of electrode, and can improve the capacity of negative pole; The characteristics of carbon black conductive agent are that particle diameter is little, and specific area is large, and conductivity is good especially, and also can play the effect that liquid is protected in imbibition in battery.
Adhesive is the auxiliary material in the lithium ion battery, and it is that electrode active material is sticked to macromolecular compound on the electrode current collecting body.Lithium-ions battery both positive and negative polarity for the meeting of volume in charge and discharge process dilation requires adhesive can play certain cushioning effect to this, therefore selects a kind of suitable adhesive very important.
As preferably, described adhesive is one or more in Kynoar (PVDF), polytetrafluoroethylene (PTFE), polyethylene glycol oxide (PEO), sodium carboxymethylcellulose (CMC), butadiene-styrene rubber (SBR), the gelatin.Further preferred, described adhesive is PVDF, has good chemical resistance, heat-resisting quantity, oxidative resistance, is the ideal chose of lithium ion battery adhesive.
1-METHYLPYRROLIDONE (NMP) is good organic solvent, can comparatively fast dissolve organic bond PVDF commonly used etc., but NMP is relatively expensive, and as preferably, the mass ratio of described 1-METHYLPYRROLIDONE and blended anode material is 0.9～1.5: 1; Described deionized water or 1-METHYLPYRROLIDONE are 0.9～1.6: 1 with the mass ratio that mixes negative material.
The invention also discloses the preparation method of described ferric phosphate lithium cell, comprise the steps:
(1) raw material of positive active material is fully mixed in proportion, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed in proportion, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate;
(2) positive plate, negative plate and barrier film are reeled or be laminated into battery core;
(3) one or several battery cores are fitted together after parallel connection;
(4) with one or in parallel after battery core be connected with battery case terminal or pole and lock;
(5) seal after will entering the fluid injection of shell battery core, be made into battery through changing into, detecting.
The present invention selects the both positive and negative polarity active material of proper ratio, and introduced the conductivity that carbon nano-tube is improved electrode material, improve the cyclical stability of both positive and negative polarity active material under the high-multiplying power discharge condition, improved discharge platform, improved the high-rate discharge ability of lithium battery.The ferric phosphate lithium cell that the present invention prepares has the large current density power, and has preferably cryogenic property, and discharge capability reaches more than 75% under-20 ℃ of conditions.
Embodiment
Embodiment 1
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of positive active material is comprised of solid portion A and solvent orange 2 A, and wherein the mass percent of solid portion A consists of:
LiFePO4: 92%;
Carbon nano-tube: 2%;
Conductive carbon material: 3%;
Adhesive: 3%;
Solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 1 times of solid portion A gross mass;
The raw material of negative electrode active material is comprised of solid portion B and solvent B, and wherein the mass percent of solid portion B consists of:
Activated carbon material: 93%;
Carbon nano-tube: 2.5%;
Conductive carbon material: 0.5%;
Adhesive: 4.0%;
Described solvent B is 1-METHYLPYRROLIDONE, and solvent B quality is 1 times of solid portion B gross mass.
Above-mentioned positive active material is fully mixed, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate; Then positive plate, negative plate and barrier film are reeled or be laminated into battery core; Several battery cores are fitted together after parallel connection; At last battery core is connected with battery case terminal or pole and locks, seal after the fluid injection, through changing into, detecting, obtain ferric phosphate lithium cell.
Adopt the ferric phosphate lithium cell of said method preparation, security performance is high, can realize the large current charge of 3C simultaneously, the heavy-current discharge of 15C, and circulation reaches 2200 times, and under-20 ℃ of conditions, discharge performance reaches 75%.
Embodiment 2
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of positive active material is comprised of solid portion A and solvent orange 2 A, and wherein, the mass percent of solid portion A consists of:
LiFePO4: 90%;
Carbon nano-tube: 5%;
Conductive carbon material: 1.0%;
Adhesive: 4.0%;
Solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 1.2 times of solid portion A gross mass;
The raw material of negative electrode active material is comprised of solid portion B and solvent B, and wherein the mass percent of solid portion B consists of:
Activated carbon material: 92%;
Carbon nano-tube: 3%;
Conductive carbon material: 0.5%;
Adhesive: 4.5%;
Solvent B is 1-METHYLPYRROLIDONE, and solvent B quality is 1.2 times of solid portion B gross mass.
Above-mentioned positive active material is fully mixed, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate; Then positive plate, negative plate and barrier film are reeled or be laminated into battery core; Several battery cores are fitted together after parallel connection; At last battery core is connected with battery case terminal or pole and locks, seal after the fluid injection, through changing into, detecting, obtain ferric phosphate lithium cell.
Adopt the automobile-used ferric phosphate lithium cell of hybrid electrically of said method preparation, security performance is high, can realize the large current charge of 5C simultaneously, the heavy-current discharge of 20C, and circulation reaches 2000 times, and under-20 ℃ of conditions, discharge performance reaches 78%.
Embodiment 3
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of positive active material is comprised of solid portion A and solvent orange 2 A, and wherein the mass percent of solid portion A consists of:
LiFePO4: 88%;
Carbon nano-tube: 6%;
Conductive carbon material: 3%;
Adhesive: 3%;
Solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 0.9 times of solid portion A gross mass;
The raw material of negative electrode active material is comprised of solid portion B and solvent B, and wherein the mass percent of solid portion B consists of:
Activated carbon material: 90%;
Carbon nano-tube: 4%;
Conductive carbon material: 2%;
Adhesive: 4%;
Solvent B is deionized water, and solvent B quality is 0.9 times of solid portion B gross mass.
Above-mentioned positive active material is fully mixed, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate; Then positive plate, negative plate and barrier film are reeled or be laminated into battery core; Several battery cores are fitted together after parallel connection; At last battery core is connected with battery case terminal or pole and locks, seal after the fluid injection, through changing into, detecting, obtain ferric phosphate lithium cell.
Adopt the automobile-used ferric phosphate lithium cell of hybrid electrically of said method preparation, security performance is high, can realize the large current charge of 4C simultaneously, the heavy-current discharge of 30C, and circulation reaches 1800 times, and under-20 ℃ of conditions, discharge performance reaches 80%.
Embodiment 4
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of positive active material is comprised of solid portion A and solvent orange 2 A, and wherein the mass percent of solid portion A consists of:
LiFePO4: 95%;
Carbon nano-tube: 0.5%;
Conductive carbon material: 0.5%;
Adhesive: 4%;
Solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 1.5 times of solid portion A gross mass;
The raw material of negative electrode active material is comprised of solid portion B and solvent B, and the mass percent of described solid portion B consists of:
Activated carbon material: 95%;
Carbon nano-tube: 0.5%;
Conductive carbon material: 0.5%;
Adhesive: 4%;
Solvent B is deionized water, and solvent B quality is 1.5 times of solid portion B gross mass.
Above-mentioned positive active material is fully mixed, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate; Then positive plate, negative plate and barrier film are reeled or be laminated into battery core; Several battery cores are fitted together after parallel connection; At last battery core is connected with battery case terminal or pole and locks, seal after the fluid injection, through changing into, detecting, obtain ferric phosphate lithium cell.
Adopt the automobile-used ferric phosphate lithium cell of hybrid electrically of said method preparation, security performance is high, can realize the large current charge of 2.5C simultaneously, the heavy-current discharge of 25C, and circulation reaches 2600 times, and under-20 ℃ of conditions, discharge performance reaches 77%.
Comparative Examples
A kind of ferric phosphate lithium cell comprises positive active material and negative electrode active material, and the raw material of positive active material is comprised of solid portion A and solvent orange 2 A, and wherein the mass percent of solid portion A consists of:
LiFePO4: 92%;
Conductive carbon material: 3%;
Adhesive: 5%;
Solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 1 times of solid portion A gross mass;
The raw material of negative electrode active material is comprised of solid portion B and solvent B, and wherein the mass percent of solid portion B consists of:
Activated carbon material: 93%;
Conductive carbon material: 3%;
Adhesive: 4%;
Described solvent B is 1-METHYLPYRROLIDONE, and solvent B quality is 1 times of solid portion B gross mass.
Above-mentioned positive active material is fully mixed, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate; Then positive plate, negative plate and barrier film are reeled or be laminated into battery core; Several battery cores are fitted together after parallel connection; At last battery core is connected with battery case terminal or pole and locks, obtain ferric phosphate lithium cell.
Adopt the ferric phosphate lithium cell of said method preparation, charging and discharging capabilities lower (1C charging, 10C discharge), and under-20 ℃ of conditions, discharge performance only is 50%.
Claims (8)
1. a ferric phosphate lithium cell comprises positive active material and negative electrode active material, it is characterized in that, the raw material of described positive active material is comprised of solid portion A and solvent orange 2 A, and the mass percent of described solid portion A consists of:
LiFePO4: 88～95%;
Carbon nano-tube: 0.5～6%;
Conductive carbon material: 0.5～3%;
Adhesive: 3～5%;
Described solvent orange 2 A is 1-METHYLPYRROLIDONE, and the solvent orange 2 A quality is 0.9～1.5 times of solid portion A gross mass;
The raw material of described negative electrode active material is comprised of solid portion B and solvent B, and the mass percent of described solid portion B consists of:
Activated carbon material: 90～96%;
Carbon nano-tube: 0.5～4%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～6%;
Described solvent B is deionized water or 1-METHYLPYRROLIDONE, and solvent B quality is 0.9～1.6 times of solid portion B gross mass.
2. ferric phosphate lithium cell as claimed in claim 1 is characterized in that, the mass percent of described solid portion A consists of:
LiFePO4: 90～95%;
Carbon nano-tube: 0.5～2%;
Conductive carbon material: 1～3%;
Adhesive: 3～5%;
The mass percent of described solid portion B consists of:
Activated carbon material: 92～96%;
Carbon nano-tube: 0.5～2%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～6%.
3. ferric phosphate lithium cell as claimed in claim 1 is characterized in that, the mass percent of described solid portion A consists of:
LiFePO4: 88～90%;
Carbon nano-tube: 3～6%;
Conductive carbon material: 0.5～2%;
Adhesive: 3～5%;
The mass percent of described solid portion B consists of:
Activated carbon material: 90～92%;
Carbon nano-tube: 3～4%;
Conductive carbon material: 0.5～1%;
Adhesive: 3～6%.
4. ferric phosphate lithium cell as claimed in claim 1 is characterized in that, described activated carbon material is at least a in Delanium, native graphite, the modified graphite.
5. ferric phosphate lithium cell as claimed in claim 1 is characterized in that, described conduction raw material of wood-charcoal is at least a in graphite agent, the carbon black conductive agent.
6. ferric phosphate lithium cell as claimed in claim 1 is characterized in that, described adhesive is one or more in Kynoar, polytetrafluoroethylene, polyethylene glycol oxide, sodium carboxymethylcellulose, butadiene-styrene rubber, the gelatin.
7. ferric phosphate lithium cell as claimed in claim 6 is characterized in that, described adhesive is Kynoar.
8. such as the preparation method of each described ferric phosphate lithium cell of claim 1～6, it is characterized in that, comprise the steps:
(1) raw material of positive active material is fully mixed in proportion, make the blended anode slurry, again the blended anode slurry is coated on aluminium foil or aluminium is online through coating machine, oven dry adds hot calender by roll squeezer and makes positive plate; The raw material of negative electrode active material is fully mixed in proportion, make the mixing cathode size, will mix cathode size again and be coated on Copper Foil or the copper mesh through coating machine, oven dry adds hot calender by roll squeezer and makes negative plate;
(2) positive plate, negative plate and barrier film are reeled or be laminated into battery core;
(3) one or several battery cores are fitted together after parallel connection;
(4) with one or in parallel after battery core be connected with battery case terminal or pole and lock;
(5) seal after will entering the fluid injection of shell battery core, be made into battery through changing into, detecting.
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| CN113471413A (en) * | 2020-03-31 | 2021-10-01 | 北京卫蓝新能源科技有限公司 | Composite lithium supplement slurry, preparation method and application |
| CN114361396A (en) * | 2021-12-21 | 2022-04-15 | 重庆东星炭素材料有限公司 | Preparation method of new energy battery electrode |
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| CN113471413A (en) * | 2020-03-31 | 2021-10-01 | 北京卫蓝新能源科技有限公司 | Composite lithium supplement slurry, preparation method and application |
| CN114361396A (en) * | 2021-12-21 | 2022-04-15 | 重庆东星炭素材料有限公司 | Preparation method of new energy battery electrode |
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Application publication date: 20130306 |