Lithium ion battery

Abstract

In order to solve the problems of serious gas production and poor high-temperature cycle performance of the existing high-nickel high-voltage lithium ion battery, the invention provides a lithium ion battery, the lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises LiNixCoyMnzL (1-x-y-z) O2, l is Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Cu, V or Fe, x is more than or equal to 0.5 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 0.5, z is more than or equal to 0 and less than or equal to 0.5, x + y + z is more than or equal to 0 and less than or equal to 1, and the upper limit voltage of the lithium ion battery is more than or equal to 4.2 V; the non-aqueous electrolyte comprises a solvent, an electrolyte salt and a compound shown as a structural formula 1, wherein the structural formula 1 is A-D-B-E-C, and the addition amount of the compound shown as the structural formula 1 is 0.01-5.0% by taking the total mass of the non-aqueous electrolyte as 100%. The ternary high-nickel lithium ion battery which is relatively high in high-temperature cycle capacity retention rate and relatively small in cycle gas production is obtained by combining the compound shown in the structural formula 1 with the high-nickel ternary material.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in life and production due to their excellent performance. In recent years, with the development of consumer electronics and new energy vehicles, people have put forward higher requirements for the performance of lithium-ion batteries, especially under high temperature conditions. The cycle performance needs to be further improved. During the cycle process of lithium-ion batteries, especially in high-nickel high-voltage ternary battery systems, when the nickel content and operating voltage of the ternary cathode material are high, the cycle gas generation of lithium-ion batteries is more serious. The possible reasons It is: on the one hand, with the increase of nickel content, the content of the original alkaline compounds on the surface of the positive electrode ma...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of severe gas production and poor high-temperature cycle performance in existing high-nickel lithium-ion batteries, the invention provides a lithium-ion battery

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