A kind of secondary battery electrolyte and secondary battery

Abstract

The invention provides a secondary battery electrolyte and a secondary battery. The provided electrolyte contains a first additive. The first additive is rich in B-O bonds and B-O-B bonds, and can be used in positive and negative electrodes. The formation of a relatively uniform and dense passivation film can effectively improve the circulation and high-temperature storage performance of the electrolyte; at the same time, the B‑O / B‑O‑B bond additives can also increase the boiling point and flash point of the electrolyte, which can inhibit the electrolyte improve the flammability of the battery and improve the safety performance of the battery. The electrolyte is more suitable for silicon-based secondary batteries, and can effectively alleviate the problems of poor cycle performance, large volume expansion, and easy gas production in high-temperature storage, which can effectively improve the performance of silicon-based secondary batteries. lay the foundation for its wide application.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a secondary battery electrolyte and a secondary battery. Background technique [0002] Lithium-ion batteries are widely used because of their high operating voltage, large specific energy, long cycle life and no memory effect. At present, lithium-ion batteries have been widely used in 3C digital consumer electronic products and power batteries. However, with the popularization of lithium-ion batteries, consumers' demands for performance of lithium-ion batteries are increasing. Graphite anodes have been unable to meet consumers' demands due to their energy limitations. Due to the high energy density of silicon, more and more With more and more attention, silicon anode is also expected to become an anode material that can effectively improve the energy density of lithium-ion batteries, but it has a serious volume expansion problem during the cycle process. Therefore, how to allevi...

AI Technical Summary

Problems solved by technology

Although the current electrolyte additives can improve the performance of silicon anode batteries to a certain extent, there are still problems such as poor cycle performance, large volume expansion, and easy gas production during high-temperature storage. Therefore, it is necessary to develop an electrolyte with better performance

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