Nonaqueous electrolyte solution and nonaqueous electrolyte battery

Abstract

Disclosed is a nonaqueous electrolyte solution which enables to obtain a battery with high capacity which generates only a small amount of gas, while being excellent in storage characteristics and cycle characteristics. This nonaqueous electrolyte solution contains an electrolyte and a nonaqueous solvent dissolving the electrolyte, and further contains a compound represented by the general formula (1) below in an amount of not less than 0.001% by volume but less than 1% by volume in the nonaqueous solvent. Alternatively, the nonaqueous electrolyte solution contains the compound represented by the general formula (1) below in an amount of not less than 0.001% by volume but less than 5% by volume in the nonaqueous solvent, and further contains at least one compound selected from the group consisting of cyclic carbonate compounds having a carbon-carbon unsaturated bond, cyclic carbonate compounds having a fluorine atom, monofluorophosphates and difluorophosphates. In the general formula (1), R<1>-R<3> independently represent an alkyl group having 1-12 carbon atoms which may be substituted by a halogen atom; and n represents an integer of 0-6.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a nonaqueous electrolytic solution battery using the nonaqueous electrolytic solution. Background technique [0002] Non-aqueous electrolyte batteries such as lithium secondary batteries have been put into practical use in a wide range of applications ranging from so-called consumer power supplies such as mobile phones and notebook computers to vehicle-mounted power supplies for driving vehicles. [0003] However, in recent years, there has been an increasing demand for higher performance of non-aqueous electrolyte batteries, and improvements in battery characteristics have been urgently desired. [0004] The electrolytic solution used in a nonaqueous electrolyte battery is usually mainly composed of an electrolyte and a nonaqueous solvent. As the main component of the non-aqueous solvent, cyclic carbonates such as ethylene carbonate and propylene carbonate; chain carbonates such ...

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Problems solved by technology

However, increasing the density of the active material layer of the electrode by pressurizing it or reducing the amount of the electrolyte cannot uniformly use the active material, and the deterioration of the active material is accelerated due to uneven reaction, and it is easy to cause problems where sufficient characteristics cannot be obtained. question

Furthermore, there is also a problem that the internal pressure of the battery will increase significantly even if the electrolyte solution decomposes to generate a small amount of gas due to the reduction of the void inside the battery due to the increase in capacity.

[0014] In the non-aqueous electrolyte secondary battery using the electrolytic solutions described in Patent Document 2 and Patent Document 3, the phosphonoacetate contained in the electrolytic solution has a hydrogen atom at the α-position of the carbonyl group, so it is presumed that the Hydrogen release reaction is easy to occur during the reductive decomposition of the side, and it is not yet satisfactory in terms of battery characteristics.

[0015] In addition, the non-aqueous electrolyte secondary battery using the electrolyte described in Patent Document 4 is not yet satisfactory in terms of gas generation suppression and high-temperature storage characteristics as described above.

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