Secondary Battery Electrolyte Additives for Stable Cycle Capacity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Secondary batteries exhibit insufficient cyclability characteristics, which limits their performance and durability in repeated charging and discharging cycles.

Innovation Solution

An electrolytic solution for secondary batteries is developed, comprising a reactive cyclic carbonic acid ester compound and an anthraquinone compound, which forms a robust film on the electrodes during charging and discharging, thereby suppressing electrolyte decomposition and maintaining discharge capacity over multiple cycles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytic solutions are used in secondary batteries, then the basic battery function is maintained, but the cyclability characteristic is insufficient

Engineering Contradiction:

Improvecyclability characteristicVSAvoidbattery life in repeated cycles

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolytic solution by introducing a specific cyclic carbonic acid ester compound with unique molecular structure (containing both cyclic carbonic acid ester group and specific substituent groups), which modifies the electrolyte's interaction with electrode surfaces and improves cyclability without compromising basic battery function

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolytic solution system by combining the novel cyclic carbonic acid ester compound with other electrolyte components (lithium salt, solvent), where the synergistic interaction between these components produces enhanced cyclability characteristics that individual components cannot achieve alone

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If the electrolytic solution composition is optimized for higher discharge capacity, then energy density improves, but stability over multiple cycles deteriorates

Engineering Contradiction:

Improvedischarge capacityVSAvoiddischarge capacity stability

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The patent optimizes the molecular structure parameters of the cyclic carbonic acid ester compound, specifically incorporating electron-donating or electron-withdrawing substituent groups at defined positions, which tunes the electrolyte's electrochemical stability window and its ability to maintain consistent discharge capacity across cycles while preserving high energy density

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 combination of reactive cyclic carbonic acid ester and anthraquinone compounds in the electrolytic solution significantly enhances the cyclability of secondary batteries by reducing electrolyte decomposition and maintaining discharge capacity, leading to improved battery performance and stability.

Implementation Method 1

forms a robust film on the electrodes during charging and discharging

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Implementation Method 2

during charging and discharging

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Implementation Method 3

suppressing electrolyte decomposition and maintaining discharge capacity over multiple cycles

Methodology Applied

Scientific EffectElectrolyte decomposition suppression: Decomposition (biological)

Data Source

PatentUS20230369648A1Electrolytic solution for secondary battery, and secondary battery

Publication Date: 2023.11.16 MURATA MFG CO LTD

AI summary

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a reactive cyclic carbonic acid ester compound and an anthraquinone compound. The reactive cyclic carbonic acid ester compound includes at least one of an unsaturated cyclic carbonic acid ester, a fluorinated cyclic carbonic acid ester, or a cyanated cyclic carbonic acid ester. The anthraquinone compound is represented by Formula (1).