Secondary Battery Oligomerizing Organic Electrode for Dissolution Control
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Solution Overview
Problem
Current secondary batteries using organic electrode active materials face challenges in achieving high energy density, high output, and stable cycle characteristics due to material dissolution and contamination in electrolyte solutions, leading to reduced effectiveness and lifespan.
Innovation Solution
A secondary battery design utilizing low-molecular-weight multi-electron organic compounds, such as dithione, dione, and diamine compounds, with a sulfone compound in the electrolyte solution, where a part of the electrode active material oligomerizes at the first charge and discharge, stabilizing the charge-discharge reaction and improving cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If low-molecular-weight multi-electron organic compounds are used as electrode active material, then capacity density is improved, but dissolution in electrolyte solution occurs leading to reduced reliability
Solution Approach 1:
The patent uses composite materials by combining low-molecular-weight multi-electron organic compounds with sulfone compounds in the electrolyte solution. This composite system allows the organic compound to oligomerize forming a stable polymer structure that maintains high capacity density while preventing dissolution in the electrolyte, thus resolving the contradiction between quantity of substance and reliability
Solution Approach 2:
The patent changes the molecular weight parameter of the electrode active material through in-situ oligomerization. The low-molecular-weight compound transforms into a higher molecular weight oligomeric structure during initial charging, which maintains the electrochemical activity for high capacity while providing structural stability against dissolution, thereby resolving the contradiction between capacity density and reliability
2Use of energy by moving object
If organic electrode active material is used, then energy density is improved, but material dissolution leads to contamination and reduced lifespan
Solution Approach 1:
The patent applies preliminary action by causing the organic electrode active material to oligomerize during the initial charging cycle before normal operation begins. This pre-formed oligomeric structure prevents subsequent dissolution and contamination during repeated charging-discharging cycles, thereby extending battery lifespan while maintaining high energy density
Solution Approach 2:
The patent converts the harmful dissolution of organic material into a beneficial process by utilizing the initial dissolution and oligomerization reaction to form a stable protective structure. The material that would otherwise dissolve and contaminate the electrolyte instead forms a stable oligomeric network that enhances both energy density and lifespan
3Quantity of substance
If multi-electron organic compounds are used for electrode reaction, then charge-discharge capacity is improved, but volume variation destroys the solid state structure
Solution Approach 1:
The patent utilizes phase transitions by transforming the electrode active material from a low-molecular-weight state to an oligomeric polymer state during initial charging. This phase transition creates a more structurally stable material that can accommodate volume variations during charge-discharge cycles without destroying the solid state structure, while maintaining high charge-discharge capacity
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 approach results in a battery with enhanced charge-discharge efficiency, high capacity density, and reduced capacity deterioration even after repeated cycles, while maintaining environmental safety and low environmental burden.
Implementation Method 1
a low-molecular-weight multi-electron organic compound which has two or more electrons to be involved in a battery electrode reaction
Implementation Method 2
an electrolyte solution formed by dissolving an electrolyte salt in a solvent, wherein the solvent contains a sulfone compound
Implementation Method 3
a part of the electrode active material is oligomerized at least at the first time of charge and discharge
Data Source
AI summary
A secondary battery that has an electrode active material mainly composed of a low-molecular-weight multi-electron organic compound that has two or more electrons to be involved in a battery electrode reaction, and a solvent for an electrolyte solution that contains a sulfone compound. Apart of the electrode active material is dissolved in and reacted with the electrolyte solution at the first charge and discharge, thereby oligomerizing a part of the electrode active material.