A lithium ion battery with excellent high-temperature cycling performance

Abstract

The invention discloses a lithium ion battery with excellent high-temperature cycling performance. The invention mainly relates to the battery field, which is applied to the power supply under the high temperature environment, and solves the defect that the existing lithium ion battery is not resistant to high temperature. The technical points are as follows: the lithium ion battery comprises a positive electrode, a negative electrode, a separator, an electrolyte and a shell, wherein the electrolyte and the separator are between the positive electrode and the negative electrode. the shell wraps the positive electrode, the negative electrode, the separator and the electrolyte. The positive electrode material is lithium manganate. The negative electrode material is artificial graphite. The diaphragm is a PP non-woven fabric diaphragm. The electrolyte comprises a high-temperature lithium salt and a high-temperature film forming additive; a layer of silicon dioxide material is coated on that surface of the high-performance positive electrode material lithium manganate, thereby improve the cycling performance of the lithium ion battery. The invention improves the high temperature resistance of the battery by adopting a high temperature resistant lithium salt and coating an oxidation material on the surface of the separator.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion battery with excellent high-temperature cycle performance. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. [0003] As the application fields of batteries become more and more extensive, the environmental requirements for batteries are becoming more and more strin...

AI Technical Summary

Problems solved by technology

[0003] As the application fields of batteries become more and more extensive, the environmental requirements for batteries are becoming more and more stringent. Due to the influence of the electrolyte, the existing lithium-ion batteries cannot be used for a long time in a high temperature environment exceeding 80°C. Time shelving, once the shelving time is too long, the electrolyte will decompose in a high temperature environment, and eventually the battery cannot be used; then this will not be able to meet the needs of some places where the battery needs to be used under high temperature conditions