Lithium ion battery electrolyte solution composition

Abstract

The invention relates to a lithium ion battery electrolyte solution composition, which comprises an electrolyte solution and an additive. The additive is selected from one or more of formula (I) compound: RaM(-X1R1) (-X2R2)...... (-XZRZ) (I), wherein Ra optionally can be C1-C10, preferably C1-C6 alkyl, C3-C6 cycloalkyl, and C6-C10 aryl substituted C1-C10, preferably C1-C6 alkyl, C3-C6 cycloalkyl, or C2-C6 alkenyl or does not exist; R1, R2,... RZ independently and optionally can be C1-C10, preferably C1-C6 alkyl, C3-C6 cycloalkyl, and C6-C10 aryl substituted C1-C10, preferably C1-C6 alkyl, C3-C6 cycloalkyl, or C2-C6 alkenyl; X1, X2,....XZ can independently be O, S, N or P or does not exist; Z is an integer keeping the formula (I) compound electroneutral; and M is Al, B, Be, Mg, Si, Ca, Sr, Ba, Ra or Zr. The invention also relates to a lithium ion battery containing the electrolyte solution composition.

Description

technical field [0001] The invention relates to lithium ion batteries, in particular to an electrolyte solution composition for lithium ion batteries. Background technique [0002] Since Sony Corporation of Japan successfully developed lithium-ion batteries in 1990, lithium-ion batteries have been used in many electronic devices such as mobile phones, notebook computers, and digital cameras due to their high energy density, high specific power, good cycle performance, no memory effect, and no pollution. devices have been widely used. Recently, a series of progress has been made in the research and development of electric vehicle power batteries, which has further expanded the application field of lithium-ion batteries, and put forward higher requirements for lithium-ion battery cycle performance, safety performance and other aspects. [0003] Lithium-ion batteries are usually composed of a positive electrode, a negative electrode, an electrolyte and a separator, and the pos...

AI Technical Summary

Problems solved by technology

[0010] Lithium-ion batteries in the prior art have very strict requirements on charging and discharging conditions, especially poor charging and discharging performance under high voltage

It is generally believed that when the currently used positive electrode material is charged under high voltage, the positive electrode material interacts with the electrolyte, which will easily cause the performance of the positive electrode to deteriorate and even the battery to fail.

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