Electrolyte and electrochemical cells

Abstract

The invention provides an electrolyte. The electrolyte comprises electrolyte salt, a first solvent and a second solvent; the first solvent can dissolve the electrolyte salt and can perform solvation on at least one kind of positive ions and negative ions in the electrolyte salt to form solvation ions; the theoretical maximum coordination number of the first solvent and the solvation ions is N; the molar ratio of the first solvent to the solvation ions is less than or equal to N to 1; the second solvent and the first solvent can be mutually soluble; and the solubility on the electrolyte salt is less than 0.01g under the electrolyte use condition. The invention also provides an electrochemical battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte and an electrochemical battery using the electrolyte, especially a lithium ion battery. Background technique [0002] With the rapid development and popularization of portable electronic products, the market demand for electrochemical batteries, especially lithium-ion batteries, is increasing day by day. Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect and less environmental pollution. As an important part of lithium-ion batteries, electrolyte has a crucial influence on the electrochemical performance of lithium-ion batteries. [0003] The electrolytic solution includes a solvent and an electrolytic salt dissolved in the solvent. A suitable electrolyte needs to be able to exist stably within the operating voltage range of the battery. Usually, the electrochemically stable vo...

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Problems solved by technology

However, on the other hand, the electrolyte also needs to have high ionic conductivity and low viscosity

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