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Cathode slurry of lithium battery, its producing method and lithium battery

A negative electrode slurry, lithium battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that high-end fine electronic products cannot be better applied, potential safety hazards, and the consistency is not particularly good. Save process, increase capacity, good bonding effect

Inactive Publication Date: 2008-04-02
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially because the consistency is not particularly good, it cannot be better applied in some high-end fine electronic products, and there are certain security risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A negative electrode slurry for a lithium battery, a preparation method and the lithium battery:

[0018] Negative electrode material: solvent: 2000 grams of nitrogen methyl pyrrolidone, binder: 50 grams of polyvinylidene fluoride, main active material: 1000 grams of nano carbon (average particle size 20nm), weak acid: 3 grams of oxalic acid.

[0019] The preparation method of the negative electrode slurry: including the steps of gluing and mixing in order, wherein:

[0020] The step of gluing refers to: pour the weighed solvent into the mixer, then add the weighed binder, start the mixer, completely dissolve the binder in the solvent, and complete the gluing step.

[0021] The step of mixing materials refers to: pour the weighed nano-carbon into the mixer, add the colloid obtained in the glue making step, start the mixer, make it mix evenly, finally add the weak acid, after stirring evenly, the prepared the mentioned slurry.

[0022] Lithium battery production: apply...

Embodiment 2

[0041] Another negative electrode slurry for lithium battery, preparation method and lithium battery:

[0042] Negative electrode material: solvent: 2500 grams of nitrogen methyl pyrrolidone, binder: 80 grams of polyvinylidene fluoride, main active material: 1000 grams of nano carbon (average particle size 50nm), weak acid: 20 grams of acetic acid.

[0043] The preparation method of the negative electrode slurry, the method of making the lithium battery and the battery test are the same as in Example 1.

[0044] After testing (as shown in Table 1), the initial capacity of the battery is 798mah. After 300 cycles of the battery in this embodiment, the capacity retention rate of the battery is 91%.

Embodiment 3

[0046] Yet another negative electrode slurry for a lithium battery, a preparation method, and a lithium battery:

[0047] Negative electrode material: solvent: 1500 grams of nitrogen methyl pyrrolidone, binder: 10 grams of polyvinylidene fluoride, main active material: 1000 grams of nano carbon (average particle size 70nm), weak acid: 1 gram of acrylic acid.

[0048] The preparation method of the negative electrode slurry, the method of making the lithium battery and the battery test are the same as in Example 1.

[0049] After testing (as shown in Table 1), the initial capacity of the battery is 802mah. After 300 cycles of the battery in this embodiment, the capacity retention rate of the battery is 93%.

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Abstract

The invention relates to a cathode slip for lithium battery, which is made by nanometer carbon, weak acid, adhesive and solvent. The adhesive is preferably polyvinylidene fluoride. The solvent is preferably N-formyl sarcolysine ketopyrrolidine which has the weight ratio of 100:0.1-2:1-8:150-250 of nanometer carbon and weak acid, polyvinylidene fluoride and N-formyl sarcolysine ketopyrrolidine. The invention further discloses the cathode slip for lithium battery and prepared lithium battery. The invention provides a cathode slip for lithium battery, preparing method and lithium battery which can effectively improve circulation performance of lithium battery.

Description

technical field [0001] The invention relates to a negative electrode slurry of a lithium battery, a preparation method and the lithium battery. Background technique [0002] Since the commercialization of rechargeable lithium batteries using carbon as the negative electrode material and lithium cobalt oxide as the positive electrode active material, rechargeable lithium batteries have begun to develop rapidly. Various forms of carbon materials such as petroleum coke, carbon fiber, pyrolytic carbon, natural graphite, and artificial graphite have been widely selected as negative electrode active materials for rechargeable lithium batteries. In order to form a surface interface film (SEI) with the surface of the negative electrode during charge and discharge and to enable the active material to be evenly coated on the pole piece without falling off, the negative active material composition also includes additives, binders, conductive agents and Organic solvents. At present, a...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04H01M10/38H01M10/40
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 黄加军郑蓉鹏张峰王伟强吴抗张建文
Owner SHENZHEN BAK BATTERY CO LTD
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