Non-Aqueous Battery Electrolyte for Stable High-Voltage CEI Films

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Solution Overview

Problem

Secondary batteries face challenges in achieving improved DCR, cycling performance, storage performance, and rate performance, particularly in high-voltage applications.

Innovation Solution

A non-aqueous electrolyte solution comprising dimethyl carbonate and a cyclic sulfate compound forms a stable inorganic-organic hybrid CEI film on the positive electrode, inhibiting side reactions and enhancing electron blocking ability, while dimethyl carbonate reduces viscosity to improve conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high-voltage resistance is improved through additive formation of CEI film, then side reactions are inhibited, but electrolyte viscosity increases and conductivity decreases

Engineering Contradiction:

Improvehigh-voltage resistance and side reaction inhibitionVSAvoidelectrolyte viscosity and conductivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Dimethyl carbonate acts as an intermediary substance that mediates between the cyclic sulfate compound and the electrode surface. It facilitates the formation of stable CEI films while maintaining low viscosity and high conductivity, effectively decoupling the conflicting requirements of film stability and ionic transport

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes the ratio of cyclic sulfate compound to dimethyl carbonate to achieve the right balance. By controlling these concentration parameters, the electrolyte forms sufficiently thick and stable CEI films for high-voltage resistance while maintaining adequate ionic conductivity through the dimethyl carbonate component

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution enhances battery DCR, cycling performance, storage performance, and rate performance by stabilizing the CEI film and reducing aerogenous quantity in cycles.

Implementation Method 1

the additive forms a more stable inorganic-organic hybrid CEI film with stronger electron blocking ability on the surface of the positive electrode

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Implementation Method 2

forms a more stable inorganic-organic hybrid CEI film with stronger electron blocking ability

Methodology Applied

Scientific EffectElectron blocking: Electron Beam

Implementation Method 3

Dimethyl carbonate can reduce the viscosity of the electrolyte solution, improve the conductivity of the electrolyte solution

Methodology Applied

Scientific EffectViscosity reduction:

Implementation Method 4

non-aqueous electrolyte solution for a secondary battery, comprising an additive and a non-aqueous solvent

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20260088355A1Non-aqueous electrolyte solution for secondary battery, secondary battery, and electrical apparatus

Publication Date: 2026.03.26 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A non-aqueous electrolyte solution for a secondary battery, a secondary battery, and an electrical apparatus are described. The non-aqueous electrolyte solution for a secondary battery of the present application comprises an additive and a non-aqueous solvent, the non-aqueous solvent comprises dimethyl carbonate, and the additive comprises a cyclic sulfate compound as represented by formula (I);