A kind of high wettability electrolytic solution and lithium ion battery for lithium ion battery

Abstract

The invention relates to high-wettability electrolyte for a lithium-ion battery and the lithium-ion battery. The electrolyte is prepared from components including lithium salt electrolyte, an organicsolvent and other functional additives, and further comprises a wettability improving additive with the adding amount of 0.01 to 5 weight percent, wherein the wetting property improving additive is am-toluenesulfonate wetting additive. According to the high-wetting-property electrolyte provided by the invention, the wetting additive is added into the electrolyte so that the liquid absorption efficiency of positive and negative electrode pieces of a lithium battery is improved; the liquid absorption consistency of the battery is improved, the consistency of an interface after formation of a battery cell is improved and the production efficiency and quality of the battery cell are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a highly wettable electrolyte solution for lithium ion batteries and the lithium ion battery. Background technique [0002] As a "rocking chair" secondary battery, compared with traditional secondary batteries, lithium-ion batteries have the advantages of high energy density, high discharge voltage, small self-discharge, no memory effect, and low environmental pollution. They are widely used in 3C electronic products, portable electronic equipment, electric tools, electric vehicles, military industry, aerospace and other fields. Especially in recent years, the country has vigorously promoted new energy vehicles, and the demand for lithium batteries has increased dramatically. [0003] With the change of the national subsidy policy and the continuous increase of people's requirements for the mileage of electric vehicles, how to improve the energy density of lithium ...

AI Technical Summary

Problems solved by technology

At this stage, people use the following three methods to improve the energy density of lithium batteries: (1) reduce the weight of the overall battery cell, that is, use thinner and stronger positive and negative current collectors, casings and cover plates; (2) use Positive and negative electrode materials with higher gram capacity; (3) Use positive and negative electrode materials with higher compaction density to maximize the space utilization of the battery, but with the improvement of battery material compaction, the use of the original electrolyte There are problems such as difficulty in absorbing liquid for the pole piece, increased injection time, and poor consistency of liquid absorption for the pole piece.

These problems will lead to longer battery production cycle, lower production efficiency, poor battery consistency, deterioration of electrical performance, and even negative electrode lithium precipitation, causing safety problems

Therefore, the development of new electrolytes to solve the problems of difficulty in absorbing liquid and poor consistency of liquid absorption for lithium battery pole pieces under high-compression conditions has become the current top priority.

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