Electrolyte, secondary battery and electric equipment

By adding trithiocarbonate additives with cyano and trimethoxysilane substituents and lithium salt as a second additive to the electrolyte, stable SEI and CEI passivation layers are formed, solving the problem of electrolyte oxidation and decomposition under high voltage and improving the interface stability and electrochemical performance of the secondary battery.

CN122291683APending Publication Date: 2026-06-26SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202610251261.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-03
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Under high voltage conditions, the electrolyte in a secondary battery undergoes oxidative decomposition to generate Lewis acidic byproducts such as HF, PF5, and POF3. These byproducts attack the passivation layer at the positive electrode/electrolyte interface, leading to the dissolution of transition metals and side reactions at the negative electrode interface, thus deteriorating electrochemical performance.

Method used

Adding trithiocarbonate additives containing cyano and trimethoxysilane substituents and lithium salt secondary additives to the electrolyte works synergistically to form stable SEI and CEI passivation layers, inhibiting interfacial reactions and improving battery performance.

Benefits of technology

It significantly improves the interface stability of secondary batteries, reduces interface internal resistance, enhances cycle and storage performance under high voltage, and reduces the risk of gas generation at high temperatures.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides an electrolyte, a secondary battery and electric equipment. The electrolyte comprises a lithium salt, a non-aqueous solvent, a first additive and a second additive; the first additive is a compound with a structure shown as a formula I: in the formula I, n is a natural number, and n is greater than or equal to 1 and less than or equal to 8; the second additive comprises at least one of lithium difluoro (oxalato) borate, lithium difluoro (oxalato) phosphate and lithium fluorosulfonate. The trithiocarbonate additive containing the cyano group and the trimethoxysilane substituent group and the lithium salt second additive are added into the electrolyte, so that the interface stability of the secondary battery can be remarkably improved, the interface internal resistance can be reduced, and the electrochemical performance of the secondary battery under high voltage can be improved.
Need to check novelty before this filing date? Find Prior Art