CN107623125A - A kind of lithium ion battery cathode slurry preparation method - Google Patents
A kind of lithium ion battery cathode slurry preparation method Download PDFInfo
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- CN107623125A CN107623125A CN201710914647.9A CN201710914647A CN107623125A CN 107623125 A CN107623125 A CN 107623125A CN 201710914647 A CN201710914647 A CN 201710914647A CN 107623125 A CN107623125 A CN 107623125A
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Abstract
The present invention relates to lithium ion battery electrode sizing agent technical field, particularly a kind of lithium ion battery cathode slurry preparation method, comprise the following steps：(1) powder premixes；(2) powder moistens；(3) high viscous stirring；(4) low viscosity mixes；(5) SBR glues are added；(6) viscosity adjusts；(7) defoaming is vacuumized.Significantly reduced after the above method, the defects of one aspect of the present invention coating surface；On the other hand carry out coating surface resistance and adhesion test test result shows：Surface resistance value is significantly smaller, and the adhesion values between coating and foil greatly improve, and the adhesion values difference between different measurement points is smaller.The cathode size prepared using the present invention is further illustrated, there is preferably dispersiveness and uniformity.The lithium ion battery prepared using the negative plate, there is lower internal resistance, and the energy density of battery, cyclical stability, big multiplying power put a performance and the circulation number of turns greatly improves.
Description
Technical field
The present invention relates to lithium ion battery electrode sizing agent technical field, prepared by particularly a kind of lithium ion battery cathode slurry
Method.
Background technology
Lithium ion battery generally comprises positive plate, negative plate, the barrier film being interval between positive plate and negative plate, positive plate
Including plus plate current-collecting body and the positive pole diaphragm being coated on plus plate current-collecting body, negative plate includes negative current collector and is coated on negative pole
Cathode membrane on collector.When prepared by electrode plates, first by active material (such as cobalt acid lithium, graphite), conductive agent (such as second
Acetylene black, CNT, carbon fiber etc.), binding agent (such as Kynoar, PVP, sodium carboxymethylcellulose,
SBR emulsion etc.) and solvent (such as 1-METHYLPYRROLIDONE, water) electrode slurry is made together, then it is coated on request
In collection liquid surface, then it is dried, obtains battery pole piece.
Wherein the performance of electrode slurry has important influence to the performance of lithium ion battery.Each component point in electrode slurry
Dissipating must be more uniform, and pole piece just has better processing characteristics, and the distribution of impedance of electrode everywhere is uniform, the active matter in discharge and recharge
The effect of matter can play bigger, and its average gram volume is played and will lifted, so as to lift the performance of full battery.
The A of Chinese invention patent CN 105140521 disclose a kind of preparation method of cathode of lithium battery slurry, including：Step
Rapid A：Thickener is added in deionized water solvent, is uniformly dissolved with mixer, is taken out standby；Step B：By negative electrode active material
Matter, conductive agent are proportionally added into agitator and are dispersed with stirring；Step C：The 55%-60% for adding thickener soln capacity stirs to above-mentioned
In powder after mixing, it is dispersed with stirring；Step D：After adding 30%-35% to the step C stirrings of thickener soln total amount
In slurry, it is dispersed with stirring；Slurry temperature is controlled at 25 DEG C -35 DEG C；Step E：Above-mentioned steps D slurry viscosity is subjected to viscosity survey
Examination, such as in normal range (NR) 2000-5000MpaS, it is directly entered in next step；Step F：Binding agent is added, is dispersed with stirring；Step
Rapid G：Under stirring, staving is vacuumized, that is, obtains prepared cathode size.
The content of the invention
The technical problem to be solved in the invention, which is to provide one kind, makes slurry disperse more uniform negative electrode of lithium ion battery
Slurry preparation method.
In order to solve the above technical problems, a kind of lithium ion battery cathode slurry preparation method of the present invention, including following step
Suddenly：
(1) powder premixes：According to graphite, conductive agent, graphite, binding agent order, by above-mentioned powder in proportion successively plus
Enter to closing in slurry kettle, be stirred and disperse, be pre-mixed 10-15min；
(2) powder moistens：The solvent for accounting for solvent total amount 15%-30% is added, is stirred and disperses, time 30-
40min；
(3) high viscous stirring：Solvent is added into conjunction slurry kettle again, solvent adding amount accounts for the 40%~50% of total solvent amount,
Be stirred and disperse, the time is 40~50min, and slurry temperature is controlled in production process, be maintained at 30~35 DEG C it
Between；
(4) low viscosity mixes：To closing in slurry kettle, the 30%~40% of total solvent amount is added, opens stirring and scattered, time
For 30~40min, whole whipping process need not carry out scraping oar, slurry temperature is controlled in production process, it is maintained at 30~
Between 35 DEG C；
(5) SBR glues are added：A certain proportion of SBR glues are added in slurry kettle is closed, is stirred and disperses, the time 20
~30min, slurry temperature is controlled in whipping process, is maintained between 30~35 DEG C；
(6) viscosity adjusts：A certain amount of scattered slurry is taken to carry out viscosity test, the range of viscosities requirement of slurry exists
5000~7000Mpa.s, if slurry viscosity is too high, adds a certain amount of solvent and carry out tune viscosity, after adding solvent, then enter
Row is stirred and disperseed, and the time is 30~40min, carries out slurry viscosity test after the completion of stirring again, and circulation is until slurry glues according to this
Degree meets to carry out next step operation after requiring；
(7) defoaming is vacuumized：By qualified slurry under stirring at low speed state, pairing slurry kettle is vacuumized, vacuum
For -0.08MPa~-0.09MPa, the time is 15~30min, you can the cathode size of preparation needed for obtaining.
Further, the conductive agent in above-mentioned steps (1) is：Conductive acetylene is black, carbon fiber, CNT, graphene, leads
One or more of mixtures in electro-graphitic.
Further, the step (2) specifically includes following steps：
Step S1：Powder once soaks, and adds solvent by the way of spray, addition account for total solvent 10%~
20%, it is stirred and disperses, the time is 15~20min；
Step S2：The secondary wetting of powder, once after the completion of wetting stirring, the 5%~10% of solvent total amount is accounted in addition
Solvent, type are stirred and disperseed, and carry out the secondary wetting of powder, the time is 15~20min.
Further, the process that the step S1 and step S2 are soaked using substep.
Further, the solvent in above-mentioned steps S1 is pure water.
Further, the binding agent in the step (1) is in sodium cellulose glycolate, water miscible Kynoar
One or two kinds of mixtures.
Further, the graphite in above-mentioned steps (1) neutralization procedure (5)：Conductive agent：Binding agent：SBR mass ratio is successively
For (90-97)：(1-4)：(1-5)：(1-4), quantity of solvent are the 65%~100% of above-mentioned total weight of solids.
Further, it is whole using nitrogen protection entirely to close slurry process, nitrogen pressure is 0.03~0.05MPa.
Further, in above-mentioned steps, mixing plant is double-planet stirring system, the subsidiary pumped vacuum systems of equipment and nitrogen
Protection system.
Further, the slurry temperature control during starching is closed to control using the method for thermostatical circulating water.
Significantly reduced after the above method, the defects of one aspect of the present invention coating surface；On the other hand coat side is carried out
Resistance and adhesion test test result show：Surface resistance value is significantly smaller, and the adhesion values between coating and foil carry significantly
Height, the adhesion values difference between different measurement points are smaller.The cathode size prepared using the present invention is further illustrated, is had
Preferably dispersiveness and uniformity.The lithium ion battery prepared using the negative plate, has lower internal resistance, and the energy of battery
Density, cyclical stability, big multiplying power put a performance and the circulation number of turns greatly improves.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the electron microscope photo scanning for the cathode pole piece that slurry is prepared using the present invention.
Fig. 2 is the particle size distribution figure of graphite of the present invention.
Fig. 3 is the particle size distribution figure of slurry of the present invention.
Fig. 4 is slurry viscosity change curve of the present invention.
Embodiment
A kind of lithium ion battery cathode slurry preparation method of the present invention, comprises the following steps：
(1) powder premixes：According to graphite, conductive agent, graphite, binding agent order, by above-mentioned powder in proportion successively plus
Enter to closing in slurry kettle, be stirred and disperse, be pre-mixed 10-15min；So feeding intake in order can be by conductive agent, binding agent
Separately launch, prevent conductive agent and binding agent from uniting, improve dispersion effect；
(2) powder moistens：The solvent for accounting for solvent total amount 15%-30% is added, is stirred and disperses, time 30-
40min；
(3) high viscous stirring：Solvent is added into conjunction slurry kettle again, solvent adding amount accounts for the 40%~50% of total solvent amount,
It is stirred and disperses, the time is 40~50min, and whole whipping process need not carry out scraping oar, to slurry temperature in production process
It is controlled, is maintained between 30~35 DEG C；
(4) low viscosity mixes：To closing in slurry kettle, the 30%~40% of total solvent amount is added, opens stirring and scattered, time
For 30~40min, whole whipping process need not carry out scraping oar, slurry temperature is controlled in production process, it is maintained at 30~
Between 35 DEG C；
(5) SBR glues are added：A certain proportion of SBR glues are added in slurry kettle is closed, is stirred and disperses, the time 20
~30min, slurry temperature is controlled in whipping process, is maintained between 30~35 DEG C；
(6) viscosity adjusts：A certain amount of scattered slurry is taken to carry out viscosity test, the range of viscosities requirement of slurry exists
5000~7000Mpa.s, if slurry viscosity is too high, adds a certain amount of solvent and carry out tune viscosity, after adding solvent, then enter
Row is stirred and disperseed, and the time is 30~40min, carries out slurry viscosity test after the completion of stirring again, and circulation is until slurry glues according to this
Degree meets to carry out next step operation after requiring；
(7) defoaming is vacuumized：By qualified slurry under stirring at low speed state, pairing slurry kettle is vacuumized, vacuum
For -0.08MPa~-0.09MPa, the time is 15~30min, you can the cathode size of preparation needed for obtaining.
Further, the conductive agent in above-mentioned steps (1) is：Conductive acetylene is black, carbon fiber, CNT, graphene, leads
One or more of mixtures in electro-graphitic.
Further, the step (2) specifically includes following steps：
Step S1：Powder once soaks, and adds solvent by the way of spray, addition account for total solvent 10%~
20%, it is stirred and disperses, the time is 15~20min；
Step S2：The secondary wetting of powder, once after the completion of wetting stirring, the 5%~10% of solvent total amount is accounted in addition
Solvent, type are stirred and disperseed, and carry out the secondary wetting of powder, the time is 15~20min.
Further, the process that the step S1 and step S2 are soaked using substep.
Further, the solvent in above-mentioned steps S1 is pure water.
Further, the binding agent in the step (1) is in sodium cellulose glycolate, water miscible Kynoar
One or two kinds of mixtures.
Further, the graphite in above-mentioned steps (1) neutralization procedure (5)：Conductive agent：Binding agent：SBR mass ratio is successively
For (90-97)：(1-4)：(1-5)：(1-4), quantity of solvent are the 65%~100% of above-mentioned total weight of solids.
Further, it is whole using nitrogen protection entirely to close slurry process, nitrogen pressure is 0.03~0.05MPa.
Further, in above-mentioned steps, mixing plant is double-planet stirring system, the subsidiary pumped vacuum systems of equipment and nitrogen
Protection system.
Further, the slurry temperature control during starching is closed to control using the method for thermostatical circulating water.
The main powder of graphite of the present invention is carried out at twice, is stirred and is disperseed after the completion of charging, can be effectively prevented from conduction
Agent and binding agent produce reunion in the slurry.Powder is soaked in two steps first when adding solvent, can be made as far as possible
Binding agent infiltrates, and effectively binding agent can be avoided to form micelle in the slurry.Fully stirred under high viscosity and high coagulant state in dispersion process
Mix, shear force of the agitating paddle to slurry is increased under high viscosity and high coagulant state so that the extruding of each component between slurry, collide, rub
Wipe more violent so that slurry is scattered more uniformly, and the later stage adds solvent and carries out low viscosity stirring, forms finely dispersed slurry
Material.In addition, the present invention uses pure dry mixing process, effects on slurry making greatly improves, whole to close the slurry process used time in 145~185min,
And in later stage continuous flow procedure, slurry viscosity detection and vacuumizing and defoaming are carried out, and further shorten mixing time simultaneously,
Improve pulping efficiency.Compared with 4~5h of conjunction slurry production of routine, using the pure dry mixing process flow of the present invention, greatly shorten
The slurry time is closed, energy consumption can be greatly reduced, reduces production cost.Reduce the can opening frequency during conjunction is starched, reduce
Extraneous factor is to the whole interference for closing slurry process, and in the case where effectively reducing human cost, substantially increase production can
Control property.
Embodiment one：
Using SP as conductive agent, sodium cellulose glycolate (CMC) is binding agent, and prescription quality ratio is according to graphite：SP：
CMC：SBR=95:1.0:1.5:2.5, the amount of solvent pure water is added for 100%, SBR of above-mentioned each component total amount in a manner of solution
Enter, solution solid content is 50%.The preparation process of slurry is as follows：
(1) powder premixes：According to graphite (50wt%), conductive agent, graphite (50wt%), CMC order, according to setting
Ratio by powder be added sequentially to close slurry kettle in, set close slurry kettle stirring and scattered rotating speed, mixing time be 10~
15min；
S1：Powder once soaks, and by the way of spray, the 15% of pure water total amount is added in kettle to closing to starch, sets and stirs
Rate of dispersion is mixed and stirred, powder is infiltrated, the time is 15~20min；
S2：The secondary wetting of powder, by the way of spray, again to closing 10% of addition pure water total amount in slurry kettle, set
Good stirring and rate of dispersion, secondary infiltration is carried out to powder, the time is 15~20min, and step need not carry out scraping oar after terminating；
(3) high viscous stirring：It is same by the way of spray after secondary immersion step terminates, add pure water to closing in slurry kettle
The 45% of total amount, setting stirring and rate of dispersion, time 45min, whole whipping process need not carry out scraping oar, production process
In slurry temperature is controlled, be maintained between 30~35 DEG C；
(4) low viscosity mixes：By the way of spray, the 30% of pure water total amount is added to closing in slurry kettle, sets stirring
And rate of dispersion, time 40min, whole whipping process need not carry out scraping oar, slurry temperature are controlled in production process,
It is maintained between 30~35 DEG C；
(5) SBR glues are added：SBR glues are added according to the ratio set originally, set stirring and scattered rotating speed, when
Between be 30min, slurry temperature is controlled in production process, is maintained between 30~35 DEG C；
(6) viscosity adjusts：Take a certain amount of scattered slurry, tested viscosity, slurry viscosity requirement 6000 ±
1000Mpa.s, if slurry viscosity is higher, it is necessary to which adding solvent carries out viscosity regulation to slurry, but solvent adding amount control is total
Within the 5% of quantity of solvent, re-start stirring and disperse, time 30min, carry out slurry viscosity test again, circulate according to this
Until slurry viscosity meets to carry out next step operation after requiring；
(7) defoaming is vacuumized：By qualified slurry under stirring at low speed state, pairing slurry kettle is vacuumized, vacuum
For -0.08MPa~-0.09MPa, the time is 15~30min, you can the cathode size of preparation needed for obtaining.As shown in figure 1, lead
Electric agent SP is uniformly coated on the surface of graphite flake, does not find micelle and the granular substance presence reunited, indicates use
The slurry-stirring process of the present invention, it can make it that slurry is scattered more uniform.In addition, as shown in Figures 2 and 3, it can be seen that prepare
Cathode size size distribution and graphite powder almost there is no difference, size distribution mainly based on D10, indicates and prepares
Slurry there is extraordinary dispersion effect；As shown in figure 4, with the extension of standing time, slurry viscosity has slight fluctuation,
But change is little, and indicating slurry has extraordinary stability, it is good using slurry scattering effect of the present invention to further illustrate.
Embodiment two：
Using SP as conductive agent, water-based PVDF is as binding agent, and prescription quality ratio is according to graphite：SP：PVDF：SBR=
95.0:1.0:1.5:2.5, the amount of solvent pure water is added for 100%, SBR of above-mentioned each component total amount in a manner of solution, solution
Solid content is 50%.The preparation process of slurry is as follows：
(1) powder premixes：According to graphite (50wt%), conductive agent, graphite (50wt%), PVDF order, according to setting
Ratio powder is added sequentially to close in slurry kettle, set the stirring for closing slurry kettle and scattered rotating speed, do time in advance as 10~
15min；
S1：Powder is once soaked, and the 15% of pure water total amount is added in kettle to closing to starch, sets stirring and rate of dispersion, right
Powder is infiltrated, and the time is 15~20min；
S2：The secondary wetting of powder, by the way of spray, again to closing 10% of addition pure water total amount in slurry kettle, set
Good stirring and rate of dispersion, secondary infiltration is carried out to powder, the time is 15~20min, and step need not carry out scraping oar after terminating；
(3) high viscous stirring：Equally by the way of spray, the 45% of pure water total amount is added to closing in slurry kettle, sets and stirs
Rate of dispersion, time 50min are mixed and stirred, whole whipping process need not carry out scraping oar, slurry temperature is controlled in production process
System, is maintained between 30~35 DEG C；
(4) low viscosity mixes：By the way of spray, the 30% of pure water total amount is added to closing in slurry kettle, sets stirring
And rate of dispersion, time 40min, whole whipping process need not carry out scraping oar, slurry temperature are controlled in production process,
It is maintained between 30~35 DEG C；
(5) SBR glues are added：SBR glues are added according to the ratio set originally, set stirring and scattered rotating speed, when
Between be 30min, slurry temperature is controlled in production process, is maintained between 30~35 DEG C；
(6) viscosity adjusts：Take a certain amount of scattered slurry, tested viscosity, slurry viscosity requirement 6000 ±
1000Mpa.s, if slurry viscosity is higher, it is necessary to which adding solvent carries out viscosity regulation to slurry, but solvent adding amount control is total
Within the 5% of quantity of solvent, stirring and scattered, time 30min are reopened, again progress slurry viscosity test；
(7) defoaming is vacuumized：By qualified slurry under stirring at low speed state, pairing slurry kettle is vacuumized, vacuum
For -0.08MPa~-0.09MPa, the time is 15~30min, you can the cathode size of preparation needed for obtaining.
Although the foregoing describing the embodiment of the present invention, those skilled in the art should be appreciated that this
Be merely illustrative of, various changes or modifications can be made to present embodiment, without departing from the present invention principle and essence,
Protection scope of the present invention is only limited by the claims that follow.
Claims (10)
1. a kind of lithium ion battery cathode slurry preparation method, it is characterised in that comprise the following steps：
(1) powder premixes：According to graphite, conductive agent, graphite, binding agent order, above-mentioned powder is added sequentially in proportion
Close in slurry kettle, be stirred and disperse, be pre-mixed 10-15min；
(2) powder moistens：The solvent for accounting for solvent total amount 15%-30% is added, is stirred and disperses, time 30-40min；
(3) high viscous stirring：Solvent is added into conjunction slurry kettle again, solvent adding amount accounts for the 40%~50% of total solvent amount, carries out
Stir and scattered, the time is 40~50min, and slurry temperature is controlled in production process, is maintained between 30~35 DEG C；
(4) low viscosity mixes：To closing in slurry kettle, the 30%~40% of total solvent amount is added, opens stirring and scattered, time 30
~40min, whole whipping process need not carry out scraping oar, slurry temperature are controlled in production process, is maintained at 30~35 DEG C
Between；
(5) SBR glues are added：Close starch kettle in add a certain proportion of SBR glues, be stirred and disperse, the time be 20~
30min, slurry temperature is controlled in whipping process, is maintained between 30~35 DEG C；
(6) viscosity adjusts：Take a certain amount of scattered slurry to carry out viscosity test, the range of viscosities requirement of slurry 5000~
7000Mpa.s, if slurry viscosity is too high, adds a certain amount of solvent and carry out tune viscosity, after adding solvent, then be stirred
With it is scattered, the time be 30~40min, carries out slurry viscosity test after the completion of stirring again, and circulation is until slurry viscosity satisfaction according to this
Next step operation is carried out after it is required that；
(7) defoaming is vacuumized：By qualified slurry under stirring at low speed state, pairing slurry kettle vacuumized, vacuum for-
0.08MPa~-0.09MPa, time are 15~30min, you can the cathode size of preparation needed for obtaining.
A kind of 2. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：Above-mentioned steps
(1) conductive agent in is：Conductive acetylene is black, one or more of mixing in carbon fiber, CNT, graphene, electrically conductive graphite
Thing.
A kind of 3. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that the step
(2) following steps are specifically included：
Step S1：Powder is once soaked, and solvent is added by the way of spray, and addition accounts for the 10%~20% of total solvent, entered
Row is stirred and disperseed, and the time is 15~20min；
Step S2：The secondary wetting of powder, once after the completion of wetting stirring, 5%~10% solvent of solvent total amount is accounted in addition,
Type is stirred and disperseed, and carries out the secondary wetting of powder, the time is 15~20min.
A kind of 4. lithium ion battery cathode slurry preparation method according to claim 3, it is characterised in that：The step S1
Process with step S2 using substep wetting.
A kind of 5. lithium ion battery cathode slurry preparation method according to claim 3, it is characterised in that：Above-mentioned steps S1
In solvent be pure water.
A kind of 6. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：The step
(1) binding agent in is one or both of sodium cellulose glycolate, water miscible Kynoar mixture.
A kind of 7. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：Above-mentioned steps
(1) graphite in neutralization procedure (5)：Conductive agent：Binding agent：SBR mass ratio is followed successively by (90-97)：(1-4)：(1-5)：(1-
4), quantity of solvent is the 65%~100% of above-mentioned total weight of solids.
A kind of 8. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：Whole close was starched
Cheng Quancheng is protected using nitrogen, and nitrogen pressure is 0.03~0.05MPa.
A kind of 9. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：Above-mentioned steps
In, mixing plant is double-planet stirring system, the subsidiary pumped vacuum systems of equipment and nitrogen protecting system.
A kind of 10. lithium ion battery cathode slurry preparation method according to claim 1, it is characterised in that：Close slurry process
In slurry temperature control using thermostatical circulating water method control.
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Cited By (13)
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| CN108172750A (en) * | 2017-12-07 | 2018-06-15 | 银隆新能源股份有限公司 | The preparation method of graphite negative electrode of lithium ion battery highly viscous slurry |
| CN108598404A (en) * | 2018-04-16 | 2018-09-28 | 清华大学 | A kind of lithium ion battery, cathode, negative conductive slurry and preparation method |
| CN108598487A (en) * | 2018-05-15 | 2018-09-28 | 中航锂电（江苏）有限公司 | A kind of preparation method of negative electrode of lithium ion battery conductive gelatin |
| CN108630884A (en) * | 2018-05-21 | 2018-10-09 | 重庆市紫建电子有限公司 | A kind of lithium ion battery anode slurry preparation method |
| CN108899469A (en) * | 2018-06-29 | 2018-11-27 | 桑顿新能源科技有限公司 | A kind of lithium ion battery negative material slurry and preparation method thereof |
| CN109560264A (en) * | 2018-10-29 | 2019-04-02 | 福建冠城瑞闽新能源科技有限公司 | A kind of preparation method of pulp of lithium ion battery |
| CN110224121A (en) * | 2019-06-10 | 2019-09-10 | 合肥众禾动力新能源科技有限公司 | A kind of preparation method of anode sizing agent |
| CN110600674A (en) * | 2019-08-31 | 2019-12-20 | 风帆有限责任公司 | Slurry mixing process of lithium ion battery slurry |
| CN110635102A (en) * | 2019-09-03 | 2019-12-31 | 芜湖天弋能源科技有限公司 | Method for manufacturing lithium ion battery cathode slurry |
| CN110787668A (en) * | 2019-11-22 | 2020-02-14 | 四川新锂想能源科技有限责任公司 | Improved mixing method for slurry preparation process of lithium ion battery |
| CN111525131A (en) * | 2020-04-08 | 2020-08-11 | 重庆市紫建电子股份有限公司 | Negative electrode material for lithium ion battery and preparation method thereof |
| CN112072093A (en) * | 2020-09-18 | 2020-12-11 | 天科新能源有限责任公司 | Lithium battery negative electrode slurry with good dispersion effect and preparation method thereof |
| CN112234199A (en) * | 2020-09-15 | 2021-01-15 | 深圳市拓邦锂电池有限公司 | Lithium ion battery positive electrode slurry, preparation method thereof and lithium ion battery positive electrode plate |
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