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Nonaqueous electrolyte solution and electrical storage device employing same

A technology of non-aqueous electrolyte and power storage equipment, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, electrolytic capacitors, etc., can solve problems such as recording, achieve suppression of gas generation, improve electrochemical characteristics, and improve discharge capacity maintenance rate effect

Inactive Publication Date: 2015-08-05
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, in Patent Documents 1 to 3, although vinylsulfonyl fluoride is suggested or described, it is not described as an example.

Method used

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  • Nonaqueous electrolyte solution and electrical storage device employing same
  • Nonaqueous electrolyte solution and electrical storage device employing same
  • Nonaqueous electrolyte solution and electrical storage device employing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～15、 comparative example 1～9

[0134] 〔Manufacture of lithium-ion secondary battery〕

[0135] 94 mass% LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 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 cut into a predetermined size to produce a strip-shaped positive electrode sheet. The density of the part of the positive electrode other than the current collector is 3.6 g / cm 3 . In addition, 10% by mass of silicon (single substance), 80% 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 wa...

Embodiment 16、17 and comparative example 10

[0153] Instead of the positive electrode active material used in Example 1 and Comparative Example 1, LiNi 1 / 2 mn 3 / 2 o 4 (positive electrode active material) to make the positive electrode sheet. 94% by mass of LiNi covered with amorphous carbon 1 / 2 mn 3 / 2 o 4 , 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 the aluminum foil (current collector), dried, pressurized, and cut into a predetermined size to prepare a positive electrode sheet, and the final charge voltage during battery evaluation was set to 4.9V. , except that the end-of-discharge voltage was set to 2.7 V, a laminated battery was produced in the same manner as in Example 1 and Comparative Example 1, and battery evaluation was performed. The results a...

Embodiment 18、19 and comparative example 11

[0157] Instead of the negative electrode active material used in Example 1 and Comparative Example 1, lithium titanate Li 4 Ti 5 o 12 (Negative electrode active material), making the negative electrode sheet. 80% by mass lithium titanate Li 4 Ti 5 o 12, 15% 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 Negative mixture paste. The negative electrode mixture paste was applied to one side of the copper foil (current collector), dried, pressurized and cut into a predetermined size to prepare a negative electrode sheet, and the final charge voltage at the time of battery evaluation was set to 2.8 V, the end-of-discharge voltage was set at 1.2 V, and the composition of the non-aqueous electrolyte was changed to a predetermined composition. A laminated battery was produced in the same manner as in Example 1 and Comparat...

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Abstract

Provided are a nonaqueous electrolyte solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolyte solution is characterized in that the nonaqueous solvent includes a cyclic carbonate and a linear carbonate satisfying the following condition 1 or 2, and the nonaqueous electrolyte solution contains vinyl sulfonyl fluoride at a level of 0.001-5 mass%; and an electrical storage device employing the same. Condition 1: the linear carbonate includes both a symmetric linear carbonate and a assymmetric linear carbonate, the proportion of the assymmetric linear carbonate in the linear carbonate being 51-95 vol%. Condition 2: Includes ethylene carbonate and propylene carbonate as the cyclic carbonates, and a symmetric linear carbonate as the linear carbonate. This nonaqueous electrolyte solution can improve the electrochemical properties when the electrical storage device is used at high voltage, and further improve the discharge capacity maintenance rate subsequent to a high voltage cycle, and can also inhibit production of gases.

Description

technical field [0001] The present invention relates to a non-aqueous electrolytic solution capable of improving electrochemical characteristics when an electrical storage device is used at a high voltage, and an electrical storage device using the non-aqueous electrolytic solution. Background technique [0002] In recent years, electrical storage devices, especially lithium secondary batteries, have been widely used as power sources for electronic devices such as mobile phones and notebook computers, electric vehicles, and power sources for power storage. Among them, in thin electronic devices such as tablet terminals and ultrabooks, laminated batteries or rectangular batteries using laminated films such as aluminum laminated films for outer packaging parts are often used. , so it is easy to cause deformation due to slight expansion of the outer package parts, etc., and there is a problem that the deformation has a great influence on the electronic equipment. [0003] A li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01G11/06H01G11/60H01G11/64H01M4/38H01M4/58H01M6/16H01M10/052H01M10/0525H01M10/0568H01M10/0569
CPCY02T10/7022Y02E60/122H01M10/0567H01G11/06H01M10/0569H01G11/60Y02E60/13H01M10/052H01G11/64Y02T10/7011H01G11/50H01M10/0525H01M2300/0037Y02E60/10Y02T10/70H01M4/131H01M4/133H01M4/134H01M4/136H01M4/386H01M4/387H01M4/485H01M4/505H01M4/525H01M4/587H01M2004/027H01M2004/028
Inventor 安部浩司古藤雄一
Owner UBE IND LTD