Film base material compositions for lithium battery electrodes and lithium battery

A lithium battery and composition technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries and other directions, can solve the problems of poor battery electrochemical performance, difficult thickener carboxymethyl cellulose, etc., and achieve battery internal resistance. Low, improve the uniformity of slurry damage, the effect of high capacity

Active Publication Date: 2012-09-05
大连宏光锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to use carboxymethyl cellulose, a thickener of a single specification, in lithium-ion batteries to achieve the effects of excellent positive and negative electrode slurry processing performance, excellent electrode sheet bonding performance and excellent battery electrochemical performance at the same time
The electrochemical performance of the battery is poor due to the defects of the pole piece coating film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Thickener preparation: take 10 g of carboxymethyl cellulose with a degree of polymerization of 1100 and a degree of substitution of 1, 15 g of carboxymethyl cellulose with a degree of polymerization of 2700 and a degree of substitution of 1, add deionized water and stir evenly at a high speed, and prepare 2 % concentration of the solution for later use.

[0023] (2) Negative plate making: prepare 100g battery negative plate film base material, get the solution 75g of above-mentioned preparation (thickener dry weight, hereinafter the same, 1.5g), binding agent styrene-butadiene rubber SBR 2g (dry weight), Conductive agent super conductive carbon black SuperP 1g, negative electrode main material graphite powder 95.5g, add appropriate amount of deionized water to the base material, control the viscosity of the slurry to 4000-5000cp, and make the battery negative plate coating slurry, use copper foil as the The current collector, according to the conventional negative e...

Embodiment 2

[0028] Thickener preparation: take 10 g of carboxymethyl cellulose with a degree of polymerization of 700 and a degree of substitution of 1, 2 g of carboxymethyl cellulose with a degree of polymerization of 3200 and a degree of substitution of 1, add deionized water and stir at a high speed to prepare a 2% concentration The solution is ready for use.

[0029] Take 75g of the above-mentioned thickener, 2g of binder, 1g of conductive agent, 95.5g of graphite powder, add deionized water, and control the viscosity of the slurry to 4000-5000cp to prepare the negative electrode slurry. Others are the same as in Example 1.

Embodiment 3

[0031] Thickener preparation: Take 10 g of carboxymethyl cellulose with a degree of polymerization of 1300 and a degree of substitution of 1, 2 g of carboxymethyl cellulose with a degree of polymerization of 2900 and a degree of substitution of 1, add deionized water and stir evenly at a high speed, and prepare a 2% concentration of carboxymethyl cellulose The solution is ready for use.

[0032] Take 75g of the above-mentioned thickener, 2g of binder, 1g of conductive agent, 95.5g of graphite powder, add deionized water, and control the viscosity of the slurry to 4000-5000cp to prepare the negative electrode slurry. Others are the same as in Example 1.

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Abstract

The invention discloses film base material compositions for lithium battery electrodes and a lithium battery. Two kinds of carboxymethylcellulose in different polymerization degrees are compounded according to a certain ratio to prepare a thickening agent, and the thickening agent is mixed with conventional binder, conductive agent, cathode main material or anode main material to prepare the filmslurry for the lithium battery electrodes, so the machinability of anode and cathode slurry can be obviously improved, conditions that the viscosity of the conventional thickening agent is difficult to control in the slurry preparing process and the uniformity of the slurry is damaged after the slurry is stood are improved, the uniformity and binding performance of positive and negative pole pieces are improved, and the electrochemical performance of the battery can be improved. The batteries assembled by pole pieces prepared from the film base material compositions for the lithium battery electrodes have the advantages of higher gram specific capacity of battery mixed powder, lower internal resistance, higher discharge platform capacity and efficiency and better 1C rate cycle performance, more cycle count, so the electrochemical performance of the lithium ion batteries is improved.

Description

technical field [0001] The invention relates to a battery manufacturing method, in particular to a battery electrode film coating method and a lithium battery. Background technique [0002] With the development of microelectronics technology in the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements on power supply. Lithium batteries have higher weight-to-energy ratio and volume-to-energy ratio; high voltage, the voltage of a single lithium battery is 3.6V, which is equal to the series voltage of 3 Ni-Cd or Ni-MH rechargeable batteries; the self-discharge is small, and it can be stored for a long time. It is the most prominent advantage of this battery; no memory effect, lithium battery does not have the so-called memory effect of nickel-cadmium batteries, so lithium batteries do not need to be discharged before charging; long life. Under normal working conditions, the number of charge / discharge cycles of the lithium battery i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 贾东镇
Owner 大连宏光锂业有限责任公司
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