Electrolyte and lithium ion battery containing same

Abstract

The invention provides an electrolyte and a lithium ion battery containing the same. The electrolyte comprises an organic solvent, an electrolyte lithium salt dissolved in the organic solvent and additives. The additives comprise a first additive and a second additive. The first additive is selected from one or more of compounds shown in a formula I, and the second additive is selected from one ormore of compounds shown in a formula II. After the electrolyte disclosed by the invention is applied to the lithium ion battery, the lithium ion battery has relatively good cycle performance and storage performance at high temperature and relatively low direct-current impedance at low temperature, and thus, the lithium ion battery has relatively good high-temperature performance and low-temperature performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolytic solution and a lithium ion battery containing the electrolytic solution. Background technique [0002] With the rapid development of consumer electronics and new energy vehicles with rechargeable batteries as power systems, people's requirements for batteries are also getting higher and higher. Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium batteries have the advantages of high specific energy density, wide operating temperature range, and long cycle life, making them occupy the mainstream position in the market for a long time. [0003] With the widespread application of lithium-ion batteries, higher requirements have been put forward for their environmental adaptability. However, current electronic products must be used in environments with high or low temperatures. Compared with conventional environments, lithiu...

AI Technical Summary

Problems solved by technology

On the one hand, although passivating the positive electrode by introducing film-forming additives can improve the high-temperature performance of lithium-ion batteries, conventional additives will deteriorate the impedance of the positive electrode, making the power performance of lithium-ion batteries poor at low temperatures; on the other hand, optimizing The composition ratio of the electrolyte solvent reduces the viscosity of the electrolyte at low temperatures to improve low-temperature performance, but this method will deteriorate the high-temperature gas production of lithium-ion batteries and cannot effectively solve the application problems of lithium-ion batteries under extreme conditions

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