Application of lithium-type molecular sieve

Abstract

The invention discloses application of a lithium-type molecular sieve in water removal, sodium removal and hydrogen fluoride removal treatment on a non aqueous electrolyte. The lithium-type molecular sieve is a full-lithium-type zeolite molecular sieve (the silica-aluminum ratio is 1:(0.9-1.1), and the lithium content exceeds 99.5%), and the full-lithium-type zeolite molecular sieve is produced by China Shipbuilding Industry Corporation 712 Research Institute and Suzhou Li'ang New Material Limited Company which are entrusted by Suzhou Simeite Surface Material Science and Technology Ltd. and has the type of LXO199/LXO280. The lithium-type molecular sieve can directly conduct water removal, sodium removal and hydrogen fluoride removal on the non aqueous electrolyte by serving as a packaging reagent, be mixed with an electrode material to be prepared into an electrode to control the water content of an assembled lithium ion battery and effectively remove hydrogen fluoride generated by the lithium battery in the charging and discharging process.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to the application of a lithium molecular sieve. Background technique [0002] For lithium-ion secondary batteries, when there is too much water in the non-aqueous electrolyte, there will be problems including electrolyte deterioration, high internal pressure, high internal resistance, high self-discharge, low capacity, low cycle life, and battery leakage. and other adverse consequences, so the water removal operation of the non-aqueous electrolyte in the lithium-ion secondary battery is very critical. When there is too much hydrogen fluoride in the non-aqueous electrolyte, it will react with lithium. On the one hand, the limited lithium ions in the battery are consumed, thereby increasing the irreversible capacity of the battery. On the other hand, a large amount of lithium fluoride appears in the reaction product. It is detrimental to the improvement of the electrochemical perf...

AI Technical Summary

Problems solved by technology

However, to achieve this, if conventional molecular sieves are impregnated in a solution containing high-concentration lithium ions for lithium ion exchange, 5 ion exchanges are required, and each exchange needs to use an excess of more than 6 times the amount of lithium ion solution. The exchange time is too long, resulting in extremely low utilization rate of lithium ions and long production cycle, resulting in high cost of lithium-type molecular sieve with high exchange ratio