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Method for inhibiting expansion of lithium ion polymer battery

A battery expansion and polymer technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of polymer lithium-ion battery swelling deformation, battery capacity and cycle performance decline, electronic equipment battery deformation and damage, etc. , to achieve the effect of improving capacity and cycle performance, superior thermal stability, and ensuring excellent performance

Inactive Publication Date: 2011-05-04
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, polymer lithium-ion batteries will emit heat during the operation of electronic equipment. High-temperature environments will easily cause the SEI film on the surface of the negative electrode of the battery to decompose and the electrolyte solvent to undergo redox decomposition reactions on the surface of the positive and negative electrodes, resulting in CO, CO 2 、CH 4 and C 2 h 6 Such gases will cause the polymer lithium-ion battery to bulge and deform, and the battery capacity and cycle performance will drop rapidly. Electronic equipment will also be damaged to a certain extent due to the deformation of the battery, and it will lead to paralysis in severe cases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for suppressing lithium-ion polymer battery expansion, characterized in that the implementation steps are as follows:

[0022] (1) Roll the positive and negative electrodes separately in a hot state, and the rolling temperature is 50-150°C;

[0023] The active material in the positive electrode sheet is LiCoO 2 , LiNiO 2 、LiNi x co y mn z o 2 (0≤x,y,z2 o 4 , LiMnO 2 、LiFePO 4 One or two or more of them are mixed in any proportion;

[0024] The active material in the negative electrode sheet is one of artificial graphite and natural graphite, or a mixture of both in any proportion;

[0025] The diaphragm adopts polyolefin microporous diaphragm with a thickness of 9-40mm and a porosity of 25-50%.

[0026] (2) Wind the positive and negative plates and the separator into battery cores according to the routine, and package them in aluminum-plastic packaging film.

[0027] (3) Mix evenly to prepare non-aqueous electrolyte containing lithium salt and film-f...

Embodiment 2

[0035] Positive electrode preparation: 94wt% LiCoO 2 , 4wt% conductive carbon black and 2wt% PVDF were mixed in NMP to form a slurry, evenly coated on the aluminum current collector, rolled at 120°C, dried, cut into a size of 81mm×650mm, and welded on one end of the aluminum tab.

[0036] Negative electrode preparation: 94wt% MCMB, 2wt% conductive carbon black and 4wt% PVDF were mixed in NMP to form a slurry, evenly coated on the copper current collector, rolled at 110°C, dried, cut into a size of 83mm×652mm, and Solder a nickel tab on one end.

[0037] Mix evenly to prepare non-aqueous electrolyte containing lithium salt and film-forming additives:

[0038] The lithium salt contained in the non-aqueous electrolyte is: LiPF 6 、LiBF 4 , LiBOB, LiN (CF 3 SO 2 ) 2 or LiN (C 2 f 5 SO 2 ) 2 One or two or more of them are mixed in any ratio, and the concentration is 0.4-1.2mol / L;

[0039] The film-forming additive in the non-aqueous electrolyte is vinylene carbonate (VC),...

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Abstract

The invention relates to a method for inhibiting expansion of a lithium ion polymer battery. The method comprises the following steps: (1) respectively rolling positive and negative plates in thermal state at the temperature of 50-150 DEG C, wherein a diaphragm is a polyolefin micropore one with thickness of 9-40mm and porosity of 25-50%; (2) winding the positive and negative plates and the diaphragm into a battery cell conventionally, and packaging the battery cell in an aluminium-plastic packaging film; (3) preparing non-water electrolyte containing lithium salt and a film-forming additive through uniform mixing, wherein the lithium salt contained in the non-water electrolyte is one of or a mixture of any two of LiPF6, LiBF4, LiBOB, LiN(CF3SO2)2 or LiN(C2F5SO2)2 and has concentration of 0.4-1.2mol / L; and the film-forming additive in the non-water electrolyte is vinylene carbonate (VC), propylene sulphite (PS) or any mixture of the VC and the PS and accounts for 0.5-4% by weight of the solvent; and (4) injecting the non-water electrolyte into the aluminium-plastic packaging film, and sealing the packaging film. The invention has the beneficial effect of effectively preventing the battery from bulging deformation under high temperature.

Description

technical field [0001] The invention relates to a method for inhibiting battery expansion, in particular to a method for inhibiting lithium ion polymer battery expansion. Background technique [0002] At present, polymer lithium-ion batteries will emit heat during the operation of electronic equipment. High-temperature environments will easily cause the SEI film on the surface of the negative electrode of the battery to decompose and the electrolyte solvent to undergo redox decomposition reactions on the surface of the positive and negative electrodes, resulting in CO, CO 2 、CH 4 and C 2 h 6 Such gases will cause the polymer lithium-ion battery to bulge and deform, and the battery capacity and cycle performance will drop rapidly. Electronic equipment will also be damaged to a certain extent due to the deformation of the battery, and it will lead to paralysis in severe cases. [0003] Therefore, it is one of the problems that those skilled in the art should start to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/139H01M10/0567H01M10/0569H01M50/119H01M50/121H01M50/124H01M50/417H01M50/491
CPCH01M10/0525H01M10/0565H01M10/0567H01M10/0568H01M10/0587H01M2300/0028Y02E60/10H01M50/124Y02P70/50H01M50/417H01M50/121H01M50/491H01M50/119
Inventor 王理孟冬王念举许刚徐子福
Owner TIANJIN LISHEN BATTERY
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