High-safety semi-solid lithium ion battery and manufacturing method thereof

Abstract

The invention relates to a high-safety semi-solid lithium ion battery and a manufacturing method thereof, the battery comprises a positive pole piece, a negative pole piece, a diaphragm and a gel solid electrolyte layer, and the gel solid electrolyte layer is located between the pole pieces and the diaphragm; and the gel solid electrolyte layer is a mixed coating formed by uniformly dispersing solid electrolyte in gel electrolyte. According to the invention, a composite layer of the gel electrolyte and the solid electrolyte is constructed between the diaphragm and the electrode through electrolyte swelling, a thermal compounding process and an in-situ curing technology, and the solid electrolyte is uniformly dispersed in the gel electrolyte, so that the migration efficiency of lithium ions in the gel electrolyte layer is effectively improved. And the diaphragm can be effectively bonded with the electrode through the polymer glue layer, so that the uniformity of an interface is ensured, short circuit caused by dislocation of a pole piece in a use process is avoided, the hardness of the battery is improved, free liquid electrolyte of a battery cell is reduced, and the safety performance of the battery is further improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-safety semi-solid lithium ion battery and a manufacturing method thereof. Background technique [0002] Compared with liquid lithium-ion batteries, semi-solid lithium-ion batteries, because a part of the electrolyte is replaced by solid electrolyte, the risk of organic electrolyte decomposition and combustion at high temperature is greatly reduced, and the safety performance of the battery is significantly improved; compared with solid-state lithium-ion batteries, it needs to overcome There are fewer technical difficulties, and it is easier to realize industrialization. Based on the above advantages, semi-solid lithium-ion batteries have been favored by many battery manufacturers. [0003] At present, the traditional semi-solid battery is coated with a solid electrolyte on the separator or added to the electrode. Although the lithium ion conduction of the all-solid batt...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional semi-solid battery is coated with a solid electrolyte on the separator or added to the electrode. Although the lithium ion conduction of the all-solid battery has been improved, the electrode interface is still not uniform enough. A high energy barrier leads to an increase in diffusion resistance, and the interface resistance will also increase the internal resistance of the battery, which will affect the life and power performance of the battery to a certain extent.

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