CN107305944A - A kind of preparation method of energy density lithium ion power battery water system negative pole - Google Patents
A kind of preparation method of energy density lithium ion power battery water system negative pole Download PDFInfo
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Abstract
The invention discloses a kind of energy density lithium ion power battery water system cathode size, it is made by raw materials such as graphite, sodium carboxymethylcellulose, ECP, butadiene-styrene rubber, NMP and deionized waters.Also disclose a kind of preparation technology of energy density lithium ion power battery water system negative pole, including prepared by mixed solvent, addition thickener, addition conductive agent, addition graphite, addition binding agent, viscosity regulation, negative pole coating, coat drying and other steps are made.The negative plate for the energy density lithium ion power battery that the present invention is prepared using the negative pole preparation method, can effectively lift the cohesive force that foil coats interlayer with negative pole, and reduction negative plate drops off risk in processing transfer process caused by imperfect bonding；The boiling point of dicyandiamide solution, the cracking risk of reduction negative plate in process caused by solvent volatilization is too fast can be effectively improved；The chemical property of battery is greatly promoted, extends the service life cycle of battery.
Description
Technical field
Field is manufactured the present invention relates to lithium ion battery, more particularly, to a kind of preparation method of energy density lithium ion power battery water system negative pole.
Background technology
Lithium ion battery energy density is big, cycle performance, high rate performance and has a safety feature, environmental protection, is electronics and dynamic field main energy sources product.With developing rapidly for electronics technology, electronics and power product increasingly tend to miniaturization, lightweight, and require faster charging rate, the big power of energy can be born, these all propose harsher requirement to performance of lithium ion battery, it is desirable to which lithium ion battery has higher energy density and power density.
Negative pole as lithium ion battery chief component, the technology of preparing of existing energy density lithium ion power battery water system negative pole is using graphite as active material, conductive charcoal class is used as conductive agent, thickener is used as using CMC, SBR family macromolecule polymer is used as binding agent, disperse obtained cathode size in aqueous solvent, then be coated uniformly on using copper foil as the foil of matrix obtained water system negative pole.Existing energy density lithium ion power battery water system negative pole is disadvantageous in that：The surface tension of graphite is less than the surface tension of water so that graphite particle surface is difficult to soak, it is not easy to scattered；The surface tension of pure water is higher than the surface tension of copper foil matrix simultaneously, contact angle between the two is more than 90 DEG C, coat is difficult to soak copper foil surface, adhesive force between negative pole coat and matrix copper foil is deteriorated, in the fabrication process, easily produce negative pole coat to come off, negative pole coat produces agglomerated particle phenomenon；Further, since the low boiling point of water, during negative pole coating high-temp is dried, water volatilization is too fast, is easily caused coating and cracks, coating is uneven, and cracks matrix foil, which is easily exposed, to be come, and negative pole fraction defective is high, is produced lot of materials and is wasted, increases manufacturing cost；Further, in later stage battery charging process, negative pole cracks are few due to active matter quality, lithium ion can embedding capacity it is very few, cause negative pole cracks produce lithium dendrite arm, lithium ion irreversible capacity increase, battery follow cycle life reduction.
The content of the invention
To solve the above problems, high the invention provides a kind of surface tension, graphite can be dispersed, the energy density lithium ion power battery water system cathode size strong with copper foil adhesive ability.
Present invention also offers difficult for drop-off, the preparation method of the good energy density lithium ion power battery water system negative pole of adhesion property after a kind of coating of cathode size.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1~1.5 part of thickener, 0.05~1 part of conductive agent, 2~4 parts of binding agent, NMP0.5~5 part, 95~115 parts of deionized water.
NMP is 1-METHYLPYRROLIDONE, 1-METHYLPYRROLIDONE is properly added in lithium-ion negative pole slurry can reduce the surface tension of water solvent, so that the surface tension of aqueous solvent is less than the surface tension of graphite, so that the graphite particle surface in slurry is easily wetted, simultaneously graphite particle is more easily dispersed in the aqueous solution, the dispersing uniformity of graphite particle can be effectively improved.
Preferably, thickener is sodium carboxymethylcellulose.
Preferably, NMP is electron level NMP.
Preferably, conductive agent is ECP.
ECP is a kind of product in conductive black Ketjen black, is a kind of high energy efficiency for being exclusively used in lithium battery, the conductive carbon black of high-purity.It is used for other compared with the conductive black of battery, Ketjen black has unique branched form, conductive contact is more, side chain forms more conductive path, thus only seldom addition is needed to be that can reach high conductance, its usage amount is fewer than other conductive carbon blacks a lot, can fill more active materials, the current density and battery capacity of battery are substantially increased, the use time of battery can be extended.
Preferably, binding agent is butadiene-styrene rubber.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, NMP is added, is pre-mixed 10~20 minutes with 15Hz low speed, dispersion temperature is 33~45 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 15~25 minutes, then it is scattered 180~240 minutes at a high speed with 30Hz, dispersion temperature is 33~45 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 15~25 minutes with 15Hz low speed, then it is scattered 40~100 minutes at a high speed with 30Hz, dispersion temperature is 33~45 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 20~30 minutes with 15Hz low speed, then it is scattered 100~240 minutes at a high speed with 30Hz, dispersion temperature is 35~60 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 15~25 minutes with 15Hz low speed, then is told scattered 20~120 minutes with 30Hz, dispersion temperature is 33~45 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 4000~8000mPas to make its viscosity, solid content is 35~46%, and fineness is 10~40 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 100~120 sieves, be transferred on film applicator, cathode size is uniformly coated on matrix copper foil for 100~135g/m2 coated weight according to one side surface density；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case.
In dispersion process, properly increase dispersion cup internal temperature, the surface tension of aqueous solvent mixed system can be reduced, so that the contact angle of equadag coating and copper foil is less than 90 °, graphite slurry coat is easily wetted matrix copper foil, the adhesive force of coated with graphite layer and matrix copper foil can be effectively improved, it is to avoid negative pole coat comes off.
Step a is the NMP stages miscible with water, and at 33~45 DEG C, the good fluidities of NMP in a solvent, mixed on low speed can meet dispersed requirement in 10-20 minutes, in addition in pure aquatic system, and low speed is scattered can to avoid NMP molecular structure from not being destroyed.Step b is thickener CMC solution preparatory phases, in CMC and the pre-mixing stage of solvent, CMC is by wet with solvent, to avoid powder from splashing, cause error, low speed should be preserved, and low speed disperses powder can be made wetted in 15~25 minutes, CMC solubility is low, and solution easily lumps, therefore low speed jitter time is longer than the addition NMP stages；Simultaneously in mix stages using method scattered at a high speed, high speed scatter stage can accelerate CMC to be dissolved into solvent, wherein at 33~45 DEG C, CMC dissolution velocities are fast, and high speed jitter time 180~240 minutes, can be such that CMC fully dissolves at this temperature.Step c is conducting solution preparatory phase, because keeping the NMP and CMC added in two steps that there is preferable dispersity in the solution, therefore the processing time of the treatment temperature in this stage and low speed premix is as above two stages, and the high speed scatter stage time is adjusted to 40~100 minutes, such handling process can make conductive carbon particle fully dispersed in the solution.Step d is graphite slurry preparatory phase, and the dispersion temperature in this stage is higher than preceding three phases, at 35~60 DEG C, and graphite slurry has good mobility, improves temperature and is conducive to improving the scattered uniformity of slurry；Meanwhile, pre-dispersed phases-time is longer than preceding three phases, 100~240 minutes high speed stage time, and in 100~240 minutes, graphite can be spreaded more evenly across in conducting solution.Step e is binding agent scatter stage, and dispersion temperature and low speed are scattered with A/B and C-stage, 2~120 minutes high speed stage time, scattered SBR to be made to be uniformly dispersed within 20~120 minutes because the SBR aqueous solution is disperse easily in graphite slurry.Step g negative poles coating procedure is carried out in succession with step h coats drying process, i.e., just enter after copper foil pole piece coating cathode size along conveyer belt and be dried in high temperature drying case.
Preferably, in step f, obtained cathode size is carried out into viscosity regulation, it is 6000mPas to make its viscosity, and solid content is 42%, and fineness is 25 μm.
Preferably, the speed that negative pole is coated in step g is 10~20m/min.
Preferably, each regional temperature is as follows in high temperature drying case：High temperature drying case front portion temperature is 75~90 DEG C, and high temperature drying case middle portion temperature is 95~130 DEG C, and high temperature drying case tail temperature is 90~100 DEG C.
Preferably, during the drying of step h high temperatures, coated negative pole is moved with 10~25m/min speed in high temperature drying case.In high-temperature drying procedures, reduction film applicator stem drying box and afterbody drying box temperature improves film speed, it is to avoid solvent volatilization is too fast, it is to avoid coat is cracked；The qualification rate of negative pole can be improved, it is to avoid the waste of negative material, reduce the manufacturing cost of battery；Avoid simultaneously because negative pole crackle makes later stage battery produce lithium dendrite arm in charging process, while the adhesive force of negative pole coat and matrix copper foil is improved, reduction and the contact resistance of matrix copper foil improve the cycle life of battery.
Therefore, the invention has the advantages that：
（1）The negative plate of the energy density lithium ion power battery prepared using the negative pole preparation method, can effectively lift the cohesive force that foil coats interlayer with negative pole, and reduction negative plate drops off risk in processing transfer process caused by imperfect bonding；
（2）The boiling point of dicyandiamide solution, the cracking risk of reduction negative plate in process caused by solvent volatilization is too fast can be effectively improved；
（3）The chemical property of battery is greatly promoted, extends the service life cycle of battery.
Brief description of the drawings
Fig. 1 is the normal temperature circulation curve map of foundation test data drafting in performance detection.
Embodiment
With reference to embodiment, the present invention is further illustrated.
Embodiment 1
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1.25 parts of sodium carboxymethylcellulose, ECP0.52 parts, 3 parts of butadiene-styrene rubber, NMP3 parts, 105 parts of deionized water.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, NMP is added, is pre-mixed 15 minutes with 15Hz low speed, dispersion temperature is 40 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 20 minutes, then it is scattered 210 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 20 minutes with 15Hz low speed, then it is scattered 70 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 25 minutes with 15Hz low speed, then it is scattered 170 minutes at a high speed with 30Hz, dispersion temperature is 50 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 20 minutes with 15Hz low speed, then is told scattered 70 minutes with 30Hz, dispersion temperature is 40 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 6000mPas to make its viscosity, and solid content is 42%, fineness is 25 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 110 sieves, be transferred on film applicator, cathode size is uniformly coated on matrix copper foil for 120g/m2 coated weight according to one side surface density, the speed of negative pole coating is 15m/min；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case.
Embodiment 2
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1.25 parts of sodium carboxymethylcellulose, ECP0.52 parts, 3 parts of butadiene-styrene rubber, NMP3 parts of electron level, 105 parts of deionized water.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, adding electron level NMP, is pre-mixed 15 minutes with 15Hz low speed, dispersion temperature is 40 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 20 minutes, then it is scattered 210 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 20 minutes with 15Hz low speed, then it is scattered 70 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 25 minutes with 15Hz low speed, then it is scattered 170 minutes at a high speed with 30Hz, dispersion temperature is 47 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 20 minutes with 15Hz low speed, then is told scattered 70 minutes with 30Hz, dispersion temperature is 40 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 6000mPas to make its viscosity, and solid content is 42%, fineness is 25 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 110 sieves, be transferred on film applicator, cathode size is uniformly coated on matrix copper foil for 115g/m2 coated weight according to one side surface density, the speed of negative pole coating is 15m/min；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case, coated negative pole is moved with 17m/min speed in high temperature drying case.
Embodiment 3
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1 part of sodium carboxymethylcellulose, ECP0.05 parts, 2 parts of butadiene-styrene rubber, NMP0.5 parts of electron level, 95 parts of deionized water.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, NMP is added, is pre-mixed 10 minutes with 15Hz low speed, dispersion temperature is 33 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 15 minutes, then it is scattered 180 minutes at a high speed with 30Hz, dispersion temperature is 33 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 15 minutes with 15Hz low speed, then it is scattered 40 minutes at a high speed with 30Hz, dispersion temperature is 33 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 20 minutes with 15Hz low speed, then it is scattered 100 minutes at a high speed with 30Hz, dispersion temperature is 35 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 15 minutes with 15Hz low speed, then is told scattered 20 minutes with 30Hz, dispersion temperature is 33 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 4000mPas to make its viscosity, and solid content is 35%, fineness is 10 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 100 sieves, be transferred on film applicator, be 100g/m according to one side surface density2Coated weight cathode size is uniformly coated on matrix copper foil, negative pole coating speed be 10m/min；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case, coated negative pole is moved with 10m/min speed in high temperature drying case；The wherein anterior temperature of high temperature drying case is 75 DEG C, and high temperature drying case middle portion temperature is 95 DEG C, and high temperature drying case tail temperature is 90 DEG C.
Embodiment 4
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1.25 parts of sodium carboxymethylcellulose, ECP0.5 parts, 3 parts of butadiene-styrene rubber, NMP3 parts of electron level, 105 parts of deionized water.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, adding electron level NMP, is pre-mixed 15 minutes with 15Hz low speed, dispersion temperature is 40 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 20 minutes, then it is scattered 210 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 20 minutes with 15Hz low speed, then it is scattered 70 minutes at a high speed with 30Hz, dispersion temperature is 40 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 25 minutes with 15Hz low speed, then it is scattered 170 minutes at a high speed with 30Hz, dispersion temperature is 47 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 20 minutes with 15Hz low speed, then is told scattered 70 minutes with 30Hz, dispersion temperature is 40 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 6000mPas to make its viscosity, and solid content is 42%, fineness is 25 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 110 sieves, be transferred on film applicator, be 120g/m according to one side surface density2Coated weight cathode size is uniformly coated on matrix copper foil, negative pole coating speed be 15m/min；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case, coated negative pole is moved with 15m/min speed in high temperature drying case；The wherein anterior temperature of high temperature drying case is 82 DEG C, and high temperature drying case middle portion temperature is 115 DEG C, and high temperature drying case tail temperature is 95 DEG C.
Embodiment 5
A kind of energy density lithium ion power battery water system cathode size, is made by the raw material of following parts by weight：96.5 parts of graphite, 1.5 parts of sodium carboxymethylcellulose, ECP1 parts, 4 parts of butadiene-styrene rubber, NMP5 parts of electron level, 115 parts of deionized water.
A kind of preparation method of energy density lithium ion power battery water system negative pole, comprises the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, NMP is added, is pre-mixed 20 minutes with 15Hz low speed, dispersion temperature is 45 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 25 minutes, then it is scattered 240 minutes at a high speed with 30Hz, dispersion temperature is 45 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 25 minutes with 15Hz low speed, then it is scattered 100 minutes at a high speed with 30Hz, dispersion temperature is 45 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 30 minutes with 15Hz low speed, then it is scattered 240 minutes at a high speed with 30Hz, dispersion temperature is 60 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 25 minutes with 15Hz low speed, then is told scattered 120 minutes with 30Hz, dispersion temperature is 45 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 8000mPas to make its viscosity, and solid content is 46%, fineness is 40 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 120 sieves, be transferred on film applicator, be 135g/m according to one side surface density2Coated weight cathode size is uniformly coated on matrix copper foil, negative pole coating speed be 20m/min；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case, coated negative pole is moved with 25m/min speed in high temperature drying case；The wherein anterior temperature of high temperature drying case is 90 DEG C, and high temperature drying case middle portion temperature is 130 DEG C, and high temperature drying case tail temperature is 100 DEG C.
In above-described embodiment, the processing technology after step h uses related process of the prior art.
Performance detection：
By to lithium battery cycle charge-discharge, and battery capacity conservation rate after discharge and recharge is recorded, draw the life-span that normal temperature circulation curve characterizes battery.
Wherein, comparative example is, using graphite as active material, using conductive charcoal class as conductive agent, then using CMC (sanlose) to be used as thickener, SBR (butadiene-styrene rubber) family macromolecule polymer is as binding agent, using water system negative pole made from existing process；Sample produced by the present invention uses obtained sample in embodiment 4.
Performance evaluation：
As shown in Figure 1, when normal temperature circulation proceeds to 710 weeks, battery capacity conservation rate according to the obtained negative pole of method in comparative example reaches 80%, and the battery capacity conservation rate that negative pole is made according to the method for embodiment in the present invention 4 is 95.6%, and as can be seen from Figure 1 in the present invention process be made negative pole battery performance more stablize will not produce larger fluctuation, therefore, the battery performance that negative pole is made according to the method for embodiment in the present invention 4 is better than the battery performance that negative pole is made in method in comparative example, negative pole is made with negative pole preparation method in cathode size formula i.e. in the present invention and thus the cycle life of the battery of negative pole assembling is better than the lithium ion battery that prior art is manufactured.
Claims (10)
1. a kind of energy density lithium ion power battery water system cathode size, it is characterised in that be made by the raw material of following parts by weight：96.5 parts of graphite, 1~1.5 part of thickener, 0.05~1 part of conductive agent, 2~4 parts of binding agent, NMP0.5~5 part, 95~115 parts of deionized water.
2. a kind of energy density lithium ion power battery water system cathode size according to claim 1, it is characterised in that：Described thickener is sodium carboxymethylcellulose.
3. a kind of energy density lithium ion power battery water system cathode size according to claim 1, it is characterised in that：Described NMP is electron level NMP.
4. a kind of energy density lithium ion power battery water system cathode size according to claim 1, it is characterised in that：Described conductive agent is ECP.
5. a kind of energy density lithium ion power battery water system cathode size according to claim 1, it is characterised in that：Described binding agent is butadiene-styrene rubber.
6. a kind of preparation method of energy density lithium ion power battery water system negative pole according to claim 1, it is characterised in that comprise the following steps：
a）It is prepared by mixed solvent：Ionized water is removed in dispersion cup, NMP is added, is pre-mixed 10~20 minutes with 15Hz low speed, dispersion temperature is 33~45 DEG C, and mixed solvent is made；
b）Add thickener：Thickener is added in the mixed solvent, after the pre- mixed on low speed of 15Hz 15~25 minutes, then it is scattered 180~240 minutes at a high speed with 30Hz, dispersion temperature is 33~45 DEG C, and glue is made；
c）Add conductive agent：Conductive agent is added into glue, is pre-mixed 15~25 minutes with 15Hz low speed, then it is scattered 40~100 minutes at a high speed with 30Hz, dispersion temperature is 33~45 DEG C, and conducting solution is made；
d）Add graphite：Graphite is added into conducting solution, is pre-mixed 20~30 minutes with 15Hz low speed, then it is scattered 100~240 minutes at a high speed with 30Hz, dispersion temperature is 35~60 minutes, and graphite slurry is made；
e）Add binding agent：Binding agent is added into graphite slurry, is pre-mixed 15~25 minutes with 15Hz low speed, then is told scattered 20~120 minutes with 30Hz, dispersion temperature is 33~45 DEG C, and cathode size is made；
f）Viscosity is adjusted：Obtained cathode size is subjected to viscosity regulation, it is 4000~8000mPas to make its viscosity, solid content is 35~46%, and fineness is 10~40 μm；
g）Negative pole is coated：By the cathode size prepared, cross after 100~120 sieves, be transferred on film applicator, be 100~135g/m according to one side surface density2Coated weight cathode size is uniformly coated on matrix copper foil；
h）Coat is dried：Coated negative pole is toasted into drying in high temperature drying case.
7. a kind of preparation method of energy density lithium ion power battery water system negative pole according to claim 6, it is characterised in that：In the step f, obtained cathode size is subjected to viscosity regulation, it is 6000mPas to make its viscosity, and solid content is 42%, fineness is 25 μm.
8. the preparation method of a kind of energy density lithium ion power battery water system negative pole according to claim 6, it is characterised in that each regional temperature is as follows in described high temperature drying case：High temperature drying case front portion temperature is 75~90 DEG C, and high temperature drying case middle portion temperature is 95~130 DEG C, and high temperature drying case tail temperature is 90~100 DEG C.
9. a kind of preparation method of energy density lithium ion power battery water system negative pole according to claim 6, it is characterised in that：The speed that negative pole is coated in the step g is 10~20m/min.
10. a kind of preparation method of energy density lithium ion power battery water system negative pole according to claim 6 or 8, it is characterised in that：When the step h high temperatures are dried, coated negative pole is moved with 10~25m/min speed in high temperature drying case.
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| CN109004217A (en) * | 2018-07-19 | 2018-12-14 | 湖北宇隆新能源有限公司 | A kind of cathode of lithium battery slice prescription |
| CN109524615A (en) * | 2018-10-31 | 2019-03-26 | 风帆有限责任公司 | A method of improving negative electrode of lithium ion battery and is coated with appearance |
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| CN109004217A (en) * | 2018-07-19 | 2018-12-14 | 湖北宇隆新能源有限公司 | A kind of cathode of lithium battery slice prescription |
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| CN109524615B (en) * | 2018-10-31 | 2021-11-16 | 风帆有限责任公司 | Method for improving coating appearance of lithium ion battery cathode |
| CN110247015A (en) * | 2019-05-09 | 2019-09-17 | 潍坊聚能电池有限公司 | A kind of manufacture craft of aqueous lithium ion battery |
| CN110931704A (en) * | 2019-11-21 | 2020-03-27 | 安徽益佳通电池有限公司 | Method for improving rolling and roll sticking of lithium ion battery cathode |
| CN111029521A (en) * | 2019-11-21 | 2020-04-17 | 安徽益佳通电池有限公司 | Preparation method of slurry for preventing negative electrode coating from curling of lithium 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 |
| CN111640945A (en) * | 2020-06-18 | 2020-09-08 | 合肥国轩高科动力能源有限公司 | Lithium ion battery anode slurry and preparation method thereof |
| CN111640945B (en) * | 2020-06-18 | 2023-01-03 | 合肥国轩高科动力能源有限公司 | Lithium ion battery anode slurry and preparation method thereof |
| CN114566644A (en) * | 2020-11-27 | 2022-05-31 | 荣盛盟固利新能源科技有限公司 | Lithium ion battery aqueous negative electrode slurry, preparation method and negative electrode plate |
| CN114566644B (en) * | 2020-11-27 | 2024-03-12 | 荣盛盟固利新能源科技有限公司 | Water-based negative electrode slurry of lithium ion battery, preparation method and negative electrode plate |
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