Sulfone-Modified Electrolyte for Battery Cycle Stability

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Solution Overview

Problem

Secondary batteries used in portable electronic devices face challenges with declining cycle characteristics, storage characteristics, and swelling due to increased power consumption and exposure to high temperatures, necessitating an improvement in battery characteristics such as chemical stability and decomposition resistance.

Innovation Solution

The use of a sulfone compound in the electrolytic solution, specifically represented by certain chemical formulas, enhances chemical stability and prevents decomposition reactions, thereby improving cycle and storage characteristics in secondary batteries.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytic solutions (carbonate-based solvents with electrolyte salts) are used, then high conductivity and stable potential are achieved, but cycle characteristics and storage characteristics decline due to decomposition reactions

Engineering Contradiction:

Improvecycle characteristicsVSAvoidchemical stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolytic solution by introducing sulfone compounds with specific molecular structures (Formula 1 and Formula 2) containing sulfur-oxygen bonds. This chemical parameter change prevents decomposition reactions while maintaining conductivity, thereby improving cycle characteristics and storage characteristics without sacrificing chemical stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolytic solution system by combining carbonate-based solvents with specifically structured sulfone compounds. This composite approach leverages the high conductivity of carbonate solvents while the sulfone compounds provide enhanced chemical stability and decomposition resistance, resolving the contradiction between reliability and compositional stability

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If secondary batteries are exposed to high-temperature atmosphere during transport or use, then portability and versatility are improved, but storage characteristics and swelling characteristics decline

Engineering Contradiction:

ImproveportabilityVSAvoidstorage characteristics

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the thermal stability parameters of the electrolytic solution by incorporating sulfone compounds with high thermal resistance. These compounds maintain their structural integrity at elevated temperatures, preventing battery swelling and degradation during high-temperature transport or use, thus maintaining storage characteristics while preserving portability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The sulfone compounds act as a protective cushioning agent against high-temperature damage. By incorporating these thermally stable compounds into the electrolytic solution beforehand, the battery is pre-protected against thermal degradation, swelling, and storage characteristic decline that would otherwise occur during high-temperature exposure in portable applications

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 inclusion of sulfone compounds in the electrolytic solution significantly improves the chemical stability and prevents decomposition, leading to enhanced cycle and storage characteristics in secondary batteries, even under high-temperature conditions.

Implementation Method 1

the solvent includes a sulfone compound represented by Chemical Formula 1... the chemical stability is improved

Methodology Applied

Scientific EffectChemical stability:

Data Source

PatentUS9153836B2Electrolytic solutions and battery

Publication Date: 2015.10.06 MURATA MFG CO LTD

AI summary

A battery capable of improving battery characteristics is provided. The battery includes a cathode, an anode and an electrolytic solution, and a separator arranged between the cathode and the anode is impregnated with the electrolytic solution. The solvent of the electrolytic solution includes a sulfone compound having a sulfonyl fluoride type structure in which a sulfonyl group and a fluorine group are bonded together, and at least one kind selected from the group consisting of a chain carbonate which includes a halogen and a cyclic carbonate which includes a halogen.