Electrolyte, electrochemical device and electronic device

Abstract

The application provides an electrolyte, an electrochemical device and an electronic device, wherein the electrolyte includes a silicon oxide compound, and the silicon oxide compound includes at least one of the compounds shown in formula I or formula II: the electrolyte in the application can reduce the use of The electrolyte improves the DC resistance of electrochemical devices and improves high-temperature storage performance.

Description

technical field [0001] The present application relates to the field of electrochemical technology, in particular to an electrolyte, an electrochemical device and an electronic device. Background technique [0002] Electrolyte is an important part of electrochemical devices (such as lithium-ion batteries). The electrolyte plays the role of transporting charges between the positive and negative electrodes of the battery. Performance, operating temperature range, and safety performance have a greater impact. [0003] In the prior art, the energy density of the electrochemical device is increased by increasing the voltage of the electrochemical device. With the increase of the positive electrode voltage, the destruction of the positive electrode structure in the electrochemical device is intensified and the side reactions increase, especially under high temperature storage conditions. The positive electrode particles undergo irreversible fragmentation, and the electrolyte conta...

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Problems solved by technology

[0003] In the prior art, the energy density of the electrochemical device is increased by increasing the voltage of the electrochemical device. With the increase of the positive electrode voltage, the destruction of the positive electrode structure in the electrochemical device is intensified and the side reactions increase, especially under high temperature storage conditions. The positive electrode particles are irreversibly fragmented, and the electrolyte contacts with the exposed positive electrode particles to exchange electrons, thereby decomposing and producing gas, which may easily lead to safety problems

[0004] The problem of electrolyte decomposition and gas generation on the surface of the positive electrode can be improved by adding positive protection additives to the electrolyte, but this will increase the DC resistance of the electrochemical device. In order to reduce the DC resistance of the electrochemical device, a low-viscosity solvent is usually used in the electrolyte , but the low boiling point and low oxidation potential of the low-viscosity solvent will lead to gas production at the positive electrode of the electrochemical device during high-temperature storage, deteriorating high-temperature storage performance

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