Non-aqueous organic electrolyte, lithium ion secondary battery containing non-aqueous organic electrolyte, preparation method of lithium ion secondary battery and terminal communication equipment

Abstract

The embodiment of the invention provides non-aqueous organic electrolyte, a lithium ion secondary battery containing the non-aqueous organic electrolyte, a preparation method of the lithium ion secondary battery and terminal communication equipment. The non-aqueous organic electrolyte comprises lithium salt, a non-aqueous organic solvent which comprises gamma-butyrolactone and a saturated cyclic ester compound shown in a formula (I), an unsaturated cyclic ester compound shown in a formula (II) and a dinitrile compound shown in a formula (III). The non-aqueous organic electrolyte has excellent chemical stability and electrochemical stability and can be used for inhibiting the decomposition of an electrolyte solvent under the high voltage and aerogenesis expansion of the lithium ion secondary battery at high temperature in the storage process and meeting the using requirement of the high-voltage lithium ion secondary battery. A cathode active material of the lithium ion secondary battery is a mixture of a spinel structure material and a laminated solid solution material. After the non-aqueous organic electrolyte is arranged in the lithium ion secondary battery, the lithium ion secondary battery has excellent high temperature storage characteristic and safety when being used under the high voltage and the full-charged condition.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary batteries, in particular to a non-aqueous organic electrolyte, a lithium-ion secondary battery containing it, a preparation method thereof, and terminal communication equipment. Background technique [0002] Lithium-ion batteries are composed of positive and negative electrodes and electrolyte, through Li + A rechargeable and dischargeable high-energy battery that inserts and extracts positive and negative electrode materials for energy exchange. With the expansion of the application field of lithium-ion secondary batteries, including the introduction of new application scenarios such as large-scale energy storage power stations and high-temperature base station backup power in recent years, especially the successive development and application of high-energy cathode materials, people are interested in high-energy lithium batteries. The demand for ion secondary batteries has become more urgen...

AI Technical Summary

Problems solved by technology

The gas generated will cause the internal pressure of the battery to increase, causing the battery to swell, seriously deteriorating the battery performance, and even failing to work properly

[0005] The electrolyte in the prior art of conventional lithium-ion secondary batteries is a 4.2V system, which is far from being able to meet the needs of high-voltage lithium-ion secondary batteries of 4.8V and above.

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