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Nonaqueous electrolyte solution and electricity storage device using same

A technology of non-aqueous electrolyte and power storage equipment, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, organic electrolyte batteries, etc., and can solve problems such as battery performance degradation

Active Publication Date: 2015-04-29
MU IONIC SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the situation is that the battery performance at high temperature tends to decrease due to the decomposition of a small amount of non-aqueous electrolyte

Method used

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  • Nonaqueous electrolyte solution and electricity storage device using same
  • Nonaqueous electrolyte solution and electricity storage device using same
  • Nonaqueous electrolyte solution and electricity storage device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～67、 comparative example 1～6

[0192] 〔Manufacture of lithium-ion secondary battery〕

[0193] 94 mass% LiCoO 2 , 3% by mass of acetylene black (conductive agent) were mixed, added to a solution obtained by dissolving 3% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance, and mixed to prepare Positive electrode mixture paste. This positive electrode mixture paste was applied to one side of an aluminum foil (current collector), dried, pressurized, and then cut into a predetermined size to obtain a positive electrode sheet. The density of the part of the positive electrode other than the current collector is 3.6 g / cm 3 .

[0194] In addition, 95% by mass of artificial graphite (d 002 =0.335 nm, negative electrode active material) was added to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance, and mixed to prepare a negative electrode mixture paste. This negative electrode mixture paste was applied to one side...

Embodiment 68～71 and comparative example 7～11

[0221] Instead of the negative electrode active material used in Examples 1, 24, 38, and 53 and Comparative Examples 2 to 6, silicon (simple substance) (negative electrode active material) was used to produce a negative electrode sheet. 40% by mass of silicon (single substance), 50% by mass of artificial graphite (d 002 = 0.335nm, negative electrode active material), 5% by mass of acetylene black (conductive agent) mixed, added to 5% by mass of polyvinylidene fluoride (binder) dissolved in 1-methyl-2-pyrrolidone in advance The resulting solution was mixed to prepare a negative electrode mixture paste. This negative electrode mixture paste is coated on one side on the copper foil (current collector), cut into the specified size after drying and pressurizing, and makes the negative electrode sheet. , 53, and Comparative Examples 2 to 6 were fabricated in the same manner as laminated batteries, and battery evaluations were performed. The results are shown in Tables 7-10.

[02...

Embodiment 72～75

[0230] Examples 72-75 and Comparative Examples 12-16

[0231] Instead of the positive electrode active material used in Examples 1, 24, 38, 53 and Comparative Examples 2 to 6, LiFePO covered with amorphous carbon was used 4 (Positive electrode active material), making a positive electrode sheet. 90% by mass of LiFePO covered by amorphous carbon 4 , 5% by mass of acetylene black (conductive agent) were mixed, added to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance, and mixed to prepare Positive electrode mixture paste. Apply this positive electrode mixture paste to one side of the aluminum foil (collector), dry and pressurize and cut it into a predetermined size to make a positive electrode sheet. The final charge voltage during battery evaluation is set to 3.6V, and Except that the end-of-discharge voltage was 2.0 V, laminated batteries were produced in the same manner as in Examples 1, 24, 38, and 53 an...

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Abstract

The present invention provides: a nonaqueous electrolyte solution which is capable of improving electrochemical characteristics at high temperatures and is also capable of improving the capacity retention rate after a high temperature cycle test, while reducing the increase rate of electrode thickness; and an electricity storage device which uses this nonaqueous electrolyte solution. A nonaqueous electrolyte solution obtained by dissolving an electrolyte salt in a nonaqueous solvent, which contains 0.001-5% by mass of a diisocyanate compound represented by OCN-L-NCO (wherein L represents an alkylene group having 4-12 carbon atoms), and which additionally contains 0.001-5% by mass of at least one compound that is selected from among specific phosphoric acid ester compounds, specific cyclic sulfonic acid ester compounds, isocyanate compounds having specific ester structures, and specific triple bond-containing compounds; and an electricity storage device which uses this nonaqueous electrolyte solution.

Description

technical field [0001] The present invention relates to a non-aqueous electrolytic solution capable of improving electrochemical properties at high temperatures, and an electrical storage device using the non-aqueous electrolytic solution. Background technique [0002] In recent years, power storage devices, particularly lithium secondary batteries, have been widely used as power sources for electronic devices such as mobile phones and notebook computers, as well as power sources for electric vehicles and power storage. Batteries installed in these electronic devices and automobiles are likely to be used in high summer temperatures or in environments where electronic devices heat up. In addition, in thin electronic devices such as tablet terminals and ultrabooks, laminated batteries or square batteries in which laminated films such as aluminum laminated films are used as outer packaging parts are often used. However, these batteries are thin and Therefore, there is a proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M6/16H01M10/052H01M10/0569H01M4/485H01M4/58H01M10/0568
CPCH01M6/168H01M10/0567H01M10/0569H01M10/052H01M10/0525H01M2300/004Y02E60/10H01M4/131H01M4/134H01M10/0568H01M4/136H01M4/386H01M4/525H01M4/485H01M4/587H01M4/5825H01M4/623H01M4/625H01M2220/10H01M2220/20H01M2220/30Y02T10/70
Inventor 安部浩司近藤正英
Owner MU IONIC SOLUTIONS CORP