A kind of electrolytic solution and lithium ion battery containing the electrolytic solution

Abstract

The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery containing the electrolyte. The electrolytic solution of the present application includes lithium salt, organic solvent and additive, contains diester compound and sulfuric acid ester compound in the additive, and diester compound includes carbonate dimer, carboxylate dimer and sultone Dimer; sulfate ester compounds include cyclic sulfate ester compounds and linear or branched chain sulfate ester compounds. The diester compound can effectively form a film on the positive electrode, inhibit the oxidation of the electrolyte on the positive electrode, and effectively improve the high temperature performance and cycle performance of the battery; the sulfuric acid ester compound can inhibit the reduction reaction of the diester compound on the negative electrode, so that the battery can obtain good Excellent low-temperature charge-discharge performance and rate performance, and can improve the cycle performance of the battery.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have significant advantages such as high specific energy, high specific power, long cycle life, and low self-discharge, and have been widely used in electronic products such as mobile communications, digital cameras, and video cameras. It is precisely because lithium-ion batteries have the above-mentioned remarkable advantages that lithium-ion batteries have become a hot spot in the development of energy storage and power batteries. However, with the wide application of lithium-ion batteries, higher requirements are put forward for the environmental adaptability of lithium-ion batteries, so that lithium-ion batteries are used in various environments; in addition, as lithium-ion batteries become smaller With the development of moderniza...

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Problems solved by technology

However, the above-mentioned schemes will lead to a series of problems such as poor electrochemical performance of lithium-ion batteries, such as high-temperature storage performance, low-temperature charge-discharge performance, and cycle life.

[0004] According to the patent report, the technology of improving the chain carbonate dimer, chain carboxylate dimer, chain sulfonate dimer or phosphate ester can improve the high temperature storage performance and cycle performance of the battery, but With higher and higher energy density, it is difficult to guarantee good low-temperature charge and discharge and rate performance of the battery only by the above.

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