Gel electrolyte and gel electrolyte battery

Abstract

The present invention provides a gel electrolyte cell including a non-aqueous electrolytic solution containing lithium-containing electrolyte salt solved in a non-aqueous solvent and made into a gel state by a matrix polymer, and the gel electrolyte contains vinylene carbonate or derivative thereof in the amount not less than 0.05 wt% and not greater than 5 wt%. This gel electrolyte exhibits an excellent chemical stability with the negative electrode, strength, and liquid-retention characteristic. This gel electrolyte enables to obtain a gel electrolyte cell satisfying the cell capacity, cycle characteristic, load characteristic, and low-temperature characteristic.

Description

technical field [0001] The present invention relates to a gel electrolyte as a nonaqueous electrolytic solution containing a lithium-containing electrolyte salt dissolved in a nonaqueous solvent and forming a gel state by a matrix polymer, and a gel electrolyte battery using the gel electrolyte. Background technique [0002] Batteries are becoming more and more important in industry as power sources for portable electronic devices. To reduce the size and weight of the device, the battery should be light in weight and not occupy much space in the device. For this, the most suitable battery is a lithium battery having a large energy density and a large output density. [0003] Among lithium batteries, the most promising are those having great flexibility or moldable shape, or sheet-type batteries having a large area, or thin card-type batteries having a small area. However, in the case of a conventional battery using a metal case as an outer case, it is difficult to manufact...

AI Technical Summary

Problems solved by technology

[0009] In addition, when using a mixture of ethylene carbonate and propylene carbonate as a non-aqueous solvent, if the content of propylene carbonate is large, the low-temperature performance and loading performance are excellent, but the initial charge / discharge efficiency is insufficient, which results in a small battery capacity and cycle performance degradation

Therefore, it has been difficult to prepare gel electrolyte batteries with excellent battery capacity, cycle performance, load performance and low temperature performance.

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