Electrolyte additive and electrolyte thereof and lithium metal battery

Abstract

The invention belongs to the technical field of batteries. The invention especially relates to an electrolyte additive for improving the composition of an SEI film on the surface of lithium metal to prolong the cycle life of a battery, and an electrolyte thereof and the lithium metal battery. The electrolyte additive containing lithium nitrate is added, the lithium nitrate has excellent dissolvingperformance in the electrolyte additive, the electrolyte additive is uniformly introduced into the lithium metal battery system, such that the stable SEI layer is formed on the lithium metal surfaceso as to effectively improve the ionic conductivity and the stability of the SEI layer, such that the occurrence of the side reaction between the electrolyte and the lithium metal is effectively prevented, the effective content of the active lithium is ensured, and the lithium metal battery has characteristics of high energy density and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of batteries, and more specifically relates to an electrolyte additive for improving the composition of an SEI film on the surface of lithium metal to increase the cycle life of the battery, its electrolyte, and a lithium metal battery. Background technique [0002] As an upgraded lithium-ion battery, lithium metal batteries are increasingly favored by the field of commercial batteries because they can store more energy and are expected to solve the problem of unsatisfactory capacity of conventional lithium-ion batteries. [0003] Due to the extremely high theoretical specific capacity (3860mAh / g) and extremely low electrochemical potential of lithium metal, lithium metal batteries with lithium metal as the negative electrode have extremely high energy density. However, the current lithium metal batteries have serious side reactions between the electrolyte and lithium metal, resulting in the rapid consumptio...

AI Technical Summary

Problems solved by technology

However, the current lithium metal batteries have serious side reactions between the electrolyte and lithium metal,

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