Secondary Battery Electrolytic Solution Decomposition Prevention

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Solution Overview

Problem

Secondary batteries face challenges in improving cycle characteristics, conservation characteristics, and load characteristics, particularly due to frequent charging and discharging in high-performance electronic devices, which existing electrolytic solutions fail to adequately address.

Innovation Solution

The use of an electrolytic solution comprising a nonaqueous solvent and electrolyte salt, combined with specific compounds such as dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds, which enhance chemical stability and suppress decomposition reactions during charge and discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytic solutions are used in secondary batteries, then basic charge and discharge function is achieved, but cycle characteristics and conservation characteristics deteriorate due to decomposition reactions during frequent charging and discharging

Engineering Contradiction:

Improvecycle characteristicsVSAvoidconservation characteristics

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The electrolytic solution contains compounds (dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds) that are added in advance to prevent decomposition reactions before they occur during charge and discharge cycles. These compounds act as protective agents that stabilize the electrolyte system from the outset, improving both cycle characteristics and conservation characteristics.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention uses a composite electrolytic solution formulation combining multiple types of compounds (dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds) working together. This composite approach provides synergistic effects that enhance chemical stability and prevent decomposition more effectively than single compounds, thereby improving reliability and duration of battery operation.

Inventive Principle:

Principle #40Composite materials

2Productivity

If frequent charging and discharging is performed to meet high-performance electronic device demands, then power delivery is improved, but decomposition reactions increase leading to worsened cycle and conservation characteristics

Engineering Contradiction:

Improvecharge and discharge frequencyVSAvoidcycle characteristics

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The electrolytic solution contains compounds that enable the system to protect itself during frequent charge and discharge operations. The dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds act as self-protective agents that stabilize the electrolyte system during high-frequency cycling, allowing improved productivity without sacrificing reliability.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If existing electrolytic solution compositions are used, then manufacturing simplicity is maintained, but chemical stability deteriorates leading to decomposition during operation

Engineering Contradiction:

Improveelectrolytic solution preparationVSAvoidchemical stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The invention modifies the chemical composition parameters of the electrolytic solution by incorporating specific compounds (dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds) at defined concentration ranges. These parameter changes enhance chemical stability while maintaining ease of manufacture through straightforward mixing and preparation processes.

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 proposed electrolytic solution significantly improves the cycle characteristics, conservation characteristics, and load characteristics of secondary batteries by enhancing chemical stability and preventing decomposition, leading to better battery performance and longevity.

Implementation Method 1

The electrolytic solution contains a nonaqueous solvent and an electrolyte salt... functioning as a medium for charge and discharge reaction

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

combined with specific compounds such as dicarbonic ester, dicarboxylic, disulfonic, fluorinated lithium phosphate, and spirodilactone compounds, which enhance chemical stability and suppress decomposition reactions during charge and discharge

Methodology Applied

Scientific EffectChemical stabilization:

Data Source

PatentUS11594758B2Secondary battery, electrolytic solution, battery pack, electronic device, and electrical vehicle

Publication Date: 2023.02.28 MURATA MFG CO LTD

AI summary

A secondary battery capable of improving cycle characteristics, conservation characteristics, and load characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. A separator provided between the cathode and the anode is impregnated with an electrolytic solution. The electrolytic solution includes one or more of a dicarbonic ester compound, a dicarboxylic compound, a disulfonic compound, a monofluoro lithium phosphate, and difluoro lithium phosphate and one or more of fluorinated lithium phosphate, fluorinated lithium borate, and imide lithium.