Secondary Battery Electrolyte for High-Temperature Cycle Stability

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Solution Overview

Problem

Current secondary battery configurations do not achieve sufficient battery characteristics, such as high-temperature cyclability, storage retention, and low-temperature load characteristics, due to limitations in electrolyte solutions.

Innovation Solution

An electrolytic solution for secondary batteries is developed, comprising an electrolyte salt with an imide anion and a sulfinyl compound, which improves the migration velocity of cations and suppresses decomposition reactions, enhancing battery performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional electrolyte solutions are used, then the battery structure is simple, but decomposition reactions occur and battery performance deteriorates

Engineering Contradiction:

Improveelectrolyte compositionVSAvoiddecomposition reactions

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The sulfinyl compounds act as intermediary substances that mediate between the electrolyte salt and electrode surfaces, forming protective films that prevent direct contact and decomposition reactions, thereby reducing harmful effects while maintaining electrolyte functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potential harm of electrolyte decomposition into a beneficial effect by using controlled decomposition of sulfinyl compounds to form stable protective films on electrodes, which then prevent further decomposition reactions and improve battery performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 proposed electrolytic solution achieves superior battery characteristics by forming a high-quality film on electrodes, improving cation migration, and effectively suppressing decomposition reactions, even in high-temperature environments, thereby enhancing cyclability, storage retention, and load retention rates.

Implementation Method 1

improving cation migration

Methodology Applied

Scientific EffectIon migration: Electrophoresis

Implementation Method 2

forming a high-quality film on electrodes

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Implementation Method 3

suppresses decomposition reactions

Methodology Applied

Scientific EffectDecomposition suppression:

Data Source

PatentUS20240372144A1Electrolytic solution for secondary battery, and secondary battery

Publication Date: 2024.11.07 MURATA MFG CO LTD

AI summary

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes an electrolyte salt and a sulfinyl compound. The electrolyte salt includes an imide anion, and the imide anion includes at least one of an anion represented by Formula (1), an anion represented by Formula (2), an anion represented by Formula (3), or an anion represented by Formula (4). The sulfinyl compound includes at least one of a compound represented by Formula (5), a compound represented by Formula (6), a compound represented by Formula (7), a compound represented by Formula (8), a compound represented by Formula (9), a compound represented by Formula (10), or a compound represented by Formula (11).