Non-Aqueous Electrolyte Composition for Low-Gas High-Temperature Storage

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Solution Overview

Problem

Existing non-aqueous electrolytes for secondary batteries do not effectively improve high-temperature storage characteristics, leading to increased gas generation and reduced capacity during high-temperature storage.

Innovation Solution

A non-aqueous electrolyte solution comprising specific compounds represented by Formulas (1) and (2), along with a non-aqueous solvent and electrolyte, which form a stable Solid Electrolyte Interphase (SEI) to reduce gas generation and maintain capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional non-aqueous electrolytes are used in secondary batteries, then basic battery operation is maintained, but high-temperature storage characteristics deteriorate with increased gas generation and reduced capacity

Engineering Contradiction:

Improvehigh-temperature storage characteristicsVSAvoidgas generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a mediator substance (cyclic carboxylate compound) that acts as an intermediary between the electrolyte components and the electrode surfaces. This mediator forms a protective interface layer that prevents direct harmful interactions, thereby suppressing gas generation during high-temperature storage while maintaining battery reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the chemical composition parameters of the electrolyte by adding specific cyclic carboxylate compounds with defined molecular structures (Formula 1). This parameter change transforms the electrolyte's chemical properties to achieve better high-temperature storage characteristics and reduced gas generation

Inventive Principle:

Principle #35Parameter changes

2Reliability

Engineering Contradiction:

Improvehigh-temperature storage characteristicsVSAvoidresidual capacity and recovery capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The cyclic carboxylate compound serves as a mediator that forms a protective interface layer on electrode surfaces during high-temperature storage. This intermediary layer prevents degradation reactions, thereby preserving both residual capacity (after storage) and recovery capacity (after recharging)

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies preliminary action by having the cyclic carboxylate compound form a protective SEI layer on the electrode surfaces before actual high-temperature storage degradation can occur. This pre-formed protective layer prevents subsequent capacity loss during storage

Inventive Principle:

Principle #10Preliminary action

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 reduces gas generation and maintains high residual and recovery capacities in secondary batteries stored at high temperatures.

Implementation Method 1

the additive may be decomposed during first charging and discharging, and a coating film called a Solid Electrolyte Interphase (SEI) may be formed on a surface of an electrode

Methodology Applied

Scientific EffectSolid Electrolyte Interphase (SEI) formation:

Data Source

PatentUS20260058199A1Non-aqueous electrolyte for secondary battery, lithium ion battery, and lithium ion capacitor

Publication Date: 2026.02.26 SUMITOMO SEIKA CHEM CO LTD

AI summary

A non-aqueous electrolyte solution for a secondary battery, containing a first compound represented by the following Formula (1), a second compound represented by the following Formula (2), a non-aqueous solvent, and an electrolyte.