Nonaqueous electrolyte solution and electricity storage device using same

Abstract

A nonaqueous electrolyte solution which contains an electrolyte, a nonaqueous solvent and a compound represented by formula (1) are provided. (In the formula (1), each of X1 and X2 independently represents C, S or P; each of n1 and n2 independently represents 1 in cases where X1 and X2 are C or P, or represents 2 in cases where X1 and X2 are S; n1 is 1 or 2; n2 is 1 or 2; each Y1 and Y2 independently represents an optionally substituted hydrocarbon group or an -OW group (wherein W represents an optionally substituted hydrocarbon); m1 is 1 or 2; m2 is 1 or 2; and Z represents an optionally substituted hydrocarbon group, an -SiV3 group (wherein V represents an optionally substituted hydrocarbon group), an organic onium or a metal element.)

Description

technical field [0001] The present invention relates to a non-aqueous electrolytic solution and an electrical storage device using the non-aqueous electrolytic solution. Background technique [0002] With the rapid development of portable electronic devices such as mobile phones and notebook computers, the requirements for high-capacity batteries used for their main power supply and backup power supply are getting higher and higher. Lithium batteries with higher energy density than nickel-cadmium batteries and nickel-metal hydride batteries Power storage devices such as ion secondary batteries have attracted attention. [0003] As a representative example of the electrolyte solution of the lithium ion secondary battery, LiPF 6 、LiBF 4 , LiN(CF 3 SO 2 ) 2 、LiCF 3 (CF 2 ) 3 SO 3 Non-aqueous electrolyte solution obtained by dissolving the electrolyte in a mixed solvent of high dielectric constant solvents such as ethylene carbonate and propylene carbonate and low-visco...

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Problems solved by technology

However, the absolute capacity as a benchmark or the relative capacity with respect to the comparative example is not given, and it is not indicated whether the high capacity retention is actually achieved

In addition, there is no method for judging the internal resistance, and the cycle characteristics of repeated charge and discharge are not implemented.

[0016] In particular, as shown in the comparison of Examples and Comparative Examples described later, in the re-evaluation performed by the present inventors, these prior arts did not have sufficient characteristics

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