Cyclic carbonate-sulfate compound and use thereof, non-aqueous electrolyte, and secondary battery

By controlling the specific rotation and content of characteristic structural compounds in cyclic carbonate-sulfate compounds, the problem of insufficient high-temperature performance of polycyclic carbonate-sulfate compounds in high-voltage lithium-ion batteries was solved, thereby improving the safety and stability of the battery at high temperatures.

WO2026113562A1PCT designated stage Publication Date: 2026-06-04SHENZHEN CAPCHEM TECH CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SHENZHEN CAPCHEM TECH CO LTD
Filing Date
2025-09-09
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing polycyclic carbonate sulfate compounds have insufficient high-temperature performance and safety performance in high-voltage lithium-ion batteries. This is mainly due to the large number of stereoisomers, which makes it difficult to study their property differences. Furthermore, the positive electrode structure is easily damaged at high temperatures, the lithium storage capacity of the negative electrode is reduced, and there is a risk of thermal runaway.

Method used

A cyclic carbonate-sulfate compound is provided. By controlling its specific rotation within the range of -7.982°·mL/(dm·g) to +7.982°·mL/(dm·g), the content of the characteristic structural compound is ensured to be ≥99wt%. A specific preparation method is used to reduce stereoisomer impurities and organic impurities, forming an axisymmetric solid electrolyte membrane, thereby improving the film quality and stability.

Benefits of technology

Under high temperature conditions, a dense and uniform solid electrolyte film is formed, which improves the safety performance and cycle stability of the battery, reduces the growth of internal resistance, avoids the risk of thermal runaway, enhances the protection of positive and negative electrode materials, and improves the overall performance of the battery.

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Abstract

In order to overcome the problems in existing high-voltage lithium ion batteries of insufficient high-temperature performance and safety performance, the present invention provides a cyclic carbonate-sulfate compound and a use thereof, a non-aqueous electrolyte, and a secondary battery. The cyclic carbonate-sulfate compound comprises a compound represented by chemical formula 1. The cyclic carbonate-sulfate compound has a specific rotation [α] of -7.982º•mL / (dm.g) to +7.982º mL / (dm.g); chemical formula 1. When the cyclic carbonate-sulfate compound provided by the present invention is used as an electrolyte additive, the resulting solid electrolyte membrane is smoother and more ordered, and thus has higher high-temperature stability, especially membrane layer stability under thermal shock conditions.
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Citation Information

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