Nonaqueous electrolytic storage battery

Abstract

The present invention provides a non-aqueous electrolyte secondary battery with excellent high temperature cycle characteristics and high temperature storage durability, further with high safety for its capability to prevent overcharge. The non-aqueous electrolyte of the present non-aqueous electrolyte secondary battery comprises the addition of vinylenecarbonate derivatives, cyclic sulfonate derivatives, phenylcycloalkane derivatives and alkyl benzene derivatives with the quaternary carbon binding to benzene ring directly.

Description

technical field [0001] The present invention relates to improvements to nonaqueous electrolyte secondary batteries (secondary batteries) aimed at improving cycle characteristics at high temperatures. Background technique [0002] In recent years, with the rapid development of miniaturization and weight reduction of mobile information terminal devices such as mobile phones, notebook computers, and PDAs, further increases in the capacity of batteries serving as driving power sources have been demanded. Non-aqueous electrolyte storage batteries represented by lithium-ion storage batteries have high energy density and high capacity, and are therefore widely used as driving power sources for the above-mentioned mobile information terminal devices. [0003] Such a non-aqueous electrolyte storage battery generally requires the use of a positive electrode composed of a lithium-containing transition metal composite oxide, a negative electrode composed of a carbon material such as gra...

AI Technical Summary

Problems solved by technology

[0013] However, in the techniques described in (1) and (2) above, repeated charging is performed while being exposed to high temperature conditions (about 100°C) or at a temperature near the upper limit of normal battery use (40-60°C). In the case of discharge, the decomposition of the electrolyte cannot be sufficiently suppressed

Therefore, sufficient cycle characteristics cannot be obtained, and at the same time, in the case of exposure to high temperature conditions (about 100°C), the internal pressure increases due to the decomposition of the solvent, and there is a risk of liquid leakage, and the battery is overcharged. Abnormal heat and smoke, these problems need to be solved

[0014] In addition, in the technology described in (3) above, since the film formed on the surface of the electrode plate is relatively rough, the effect of improving the cycle characteristics is not obvious, and there are problems such as smoke during overcharging.

[0015] In addition, although the technology described in (4) above can prevent overcharging, at temperatures near the upper limit of normal battery use (40-60°C), the additives slowly decompose and polymerize as charge and discharge progress. The internal resistance increases, and the cycle characteristics are greatly deteriorated

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