Electrolyte solution and electrochemical energy storage device
An electrolyte and electrolyte salt technology, applied in the field of energy storage devices, can solve the problems of capacity attenuation of lithium-ion batteries, poor high-temperature storage performance of lithium-ion batteries, etc., and achieve the effect of good high-temperature storage performance
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[0009] The electrolyte and electrochemical energy storage device according to the present application will be described in detail below.
[0010] First, the electrolyte according to the first aspect of the present application will be explained.
[0011] The electrolyte according to the first aspect of the present application includes an electrolyte salt and additives. The additives include sulfonate cyclic quaternary ammonium salts and isocyanate compounds, and the number of -N=C-O in the isocyanate compound is greater than or equal to 2.
[0012] In the electrolyte according to the first aspect of the present application, the sulfonate cyclic quaternary ammonium salt and isocyanate compound can form a dense, uniform and stable layer on the positive and negative electrode surfaces of the electrochemical energy storage device. The chemical film, especially on the surface of the negative electrode, can form a low-impedance and dense solid electrolyte interface film (SEI film) to reduc...
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