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Lithium battery and manufacturing method thereof

A manufacturing method and technology for lithium batteries, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of battery explosion, inability to effectively suppress deoxidation, and no thermal actuation safety mechanism, etc., to improve safety, The effect of reducing the risk of thermal runaway occurring

Active Publication Date: 2010-08-18
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the protective film formed by introducing metal oxide or metal fluoride on the surface of the electrode material itself does not have a thermal safety mechanism, and it cannot effectively inhibit the deoxidation phenomenon. It is effective for internal short circuits caused by external environmental factors, such as Accidental puncture or external impact damage, the risk of battery explosion caused by instantaneous high heat has not been effectively reduced

Method used

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  • Lithium battery and manufacturing method thereof
  • Lithium battery and manufacturing method thereof
  • Lithium battery and manufacturing method thereof

Examples

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specific example

[0038] Specific examples include: vinylimide (N-vinylimide), N-vinylphthalimide (N-vinylphthalimide), vinylacetamide (vinylacetamide), and the like.

[0039] (A4) The above-mentioned maleimides (maleimides) include monomaleimide, bismaleimide, trimaleimide and polymaleimide, wherein bismaleimide mono Body has structure shown in formula (I) or formula (II):

[0040]

[0041] Formula (I) Formula (II)

[0042] where R 1 for-RCH 2 R-, -RNH 2 R-, -C(O)CH 2 -, -CH 2 OCH 2 -, -C(O)-, -O-, -O-O-, -S-, -S-S-, -S(O)-, -CH 2 S(O)CH 2 -, -(O)S(O)-, phenylene (-C 6 h 4 -), biphenylene, substituted phenylene (such as -CH 2 (C 6 h 4 )CH 2 -, -CH 2 (C 6 h 4 )(O)-) or substituted biphenylene, and R 2 for-RCH 2 -, -C(O)-, -C(CH 3 ) 2 -, -O-, -O-O-, -S-, -S-S-, -(O)S(O)-, or -S(O)-, wherein R is an alkyl group of 1-6 carbons. Specific examples of bismaleimide include: N, N'-bismaleimide-4,4'-diphenylmethane (N,N'-bismaleimide-4,4'-diphenylmethane), 1 , 1'-(methylenedi-4...

Synthetic example 1～9

[0073](1) 2.55 grams (0.071M) N, N'-4,4'-diphenylmethane-bismaleimide and 0.45 grams (0.035M) barbituric acid are placed in a 500 milliliter four-neck reactor Add 97 grams of N-methylpyrrolone (NMP) and stir to dissolve it; then react at 130°C for 48 hours to obtain a nitrogen-containing polymer with a solid content of 3.0%, which is a double bifurcation structure. Maleimide oligomers have a bifurcation degree of about 75%; DSC analysis (heating rate: 10°C / min@N2) shows that the thermal crosslinking temperature is about 80°C to 90°C.

[0074] (2) 2.55 grams (0.071M) of N, N'-4,4'-diphenylmethane-bismaleimide and 0.45 grams (0.035M) of barbituric acid were placed in a 500 milliliter four-neck reactor Add 97 grams of γ-butyl lactone (GBL) and stir to dissolve it; then react at 130°C for 48 hours to obtain a nitrogen-containing polymer with a solid content of 3.0%, and its bifurcation degree is about 65%; DSC According to the analysis (heating rate: 10°C / min@N2), the thermal cro...

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Abstract

The invention provides a lithium battery. The lithium battery comprises a positive electrode plate, a negative electrode plate, a separator and electrolyte solution, wherein the separator is positioned between the positive electrode plate and the negative electrode plate for defining an accommodating area in which the electrolyte solution is positioned; a thermal actuation protection film is arranged on a material surface of the positive electrode plate or the negative electrode plate; and when the temperature of the lithium battery rises to the temperature for the thermal actuation, which isabout 80 to 280 DEG C, the thermal actuation protection film undergoes cross linking reaction to prevent thermal runaway so as to further prevent the battery from exploding. The invention also provides a manufacturing method for the lithium battery.

Description

technical field [0001] The invention relates to a secondary lithium ion battery, and in particular to a high-safety secondary lithium ion battery with a thermal actuation safety mechanism, and a manufacturing method thereof. Background technique [0002] Since the primary battery does not meet the requirements of environmental protection, rechargeable secondary battery systems have gradually attracted attention in recent years. With the rapid development and popularization of portable electronic products, the market demand for lithium-ion secondary batteries is increasing day by day due to the characteristics of light weight, high voltage value and high energy density. Compared with nickel-hydrogen, nickel-zinc, and nickel-cadmium batteries, lithium-ion secondary batteries have the advantages of high working voltage, high energy density, light weight, long life and good environmental protection, and are also the best choice for flexible batteries in the future. choose. [...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/40H01M4/02H01M4/62H01M10/38H01M4/04
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 吴弘俊郑锦淑许荣木王复民杨长荣潘金平苏静怡王宗雄
Owner IND TECH RES INST
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