Electrolyte and electrochemical device comprising same, and electronic device

Abstract

The present application relates to an electrolyte and an electrochemical device comprising the same, and an electronic device. The electrolyte comprises one or more nitrile benzoquinone compounds selected from the group consisting of compounds represented by a formula I, a formula II and a formula III, wherein substituents R1-R9 are respectively independently selected from the group consisting ofhydrogen, C2-C12 ether groups, C1-C12 alkoxy groups, halogens, C1-C12 alkyl groups, C2-C12 alkenyl groups, C2-C12 alkynyl groups, and C6-C26 aryl groups. The electrolyte can form a stable protective film on the cathode to effectively improve the cycle capacity retention rate and high-temperature storage performance of the electrochemical device.

Description

technical field [0001] The present application relates to the technical field of energy storage, and in particular to an electrolyte and an electrochemical device including the electrolyte. Background technique [0002] In order to meet people's demand for high energy density of lithium-ion batteries, the voltage platform of lithium-ion batteries has been continuously improved. However, as the voltage increases, the side reaction between the positive electrode and the electrolyte becomes more serious, and the particle surface layer of the positive electrode undergoes a phase change and becomes inactivated, resulting in increased impedance and loss of battery capacity. In addition, the electrolyte will oxidize on the surface of the positive electrode to form by-products and adhere to the surface of the positive electrode, which further leads to an increase in impedance and a rapid decline in battery capacity. Therefore, it is crucial to improve and optimize the composition o...

AI Technical Summary

Problems solved by technology

However, as the voltage increases, the side reaction between the positive electrode and the electrolyte becomes more serious, and the particle surface of the positive electrode will undergo a phase change and be inactivated, resulting in an increase in impedance and a loss of battery capacity.

In addition, the electrolyte will oxidize on the surface of the positive electrode to form by-products and adhere to the surface of the positive electrode, which further leads to an increase in impedance and a rapid decline in battery capacity.

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