Metal Salt Additives for Secondary Battery Anode Protection
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Solution Overview
Problem
Secondary batteries face challenges in improving battery capacity characteristics, cycle characteristics, and suppressing resistance rise and swollenness due to the decomposition reaction of the electrolytic solution, especially when ion conductivity and viscosity are increased to enhance ion movement between the cathode and anode.
Innovation Solution
Incorporating a metal salt with an unsaturated carbon bond into the anode or electrolytic solution to form a stable protective film on the anode surface, reducing resistance and decomposition reactions, and enhancing battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coat is formed on the anode surface to suppress decomposition reaction of the electrolytic solution, then cycle characteristics are improved, but resistance of the anode is increased and battery capacity characteristics are not sufficiently improved
Solution Approach 1:
The patent introduces metal salts with unsaturated carbon bonds (acetylide, vinylidene, vinylene, vinyl, phenyl, or cyclopentadienyl groups) as additives to the electrolytic solution or anode. These metal salts form protective films with specific chemical compositions and structures that differ from conventional coatings, achieving a balance between suppressing decomposition reactions and maintaining low resistance for high battery capacity and good cycle characteristics
Solution Approach 2:
The protective film is formed as a composite structure containing metal salts with unsaturated carbon bonds combined with other electrolyte components. This composite composition enables the film to simultaneously provide protection against decomposition reactions and maintain electrical conductivity, resolving the contradiction between reliability improvement and resistance increase
2Speed
If ion conductivity of the electrolytic solution is increased or viscosity is lowered to improve ion movement speed, then ion transport is enhanced, but resistance of the anode is increased due to the coat
Solution Approach 1:
The metal salt additives change the chemical and physical parameters of the protective film, creating a film structure that is more conductive to ions while still providing protection. The unsaturated carbon bond structures in the metal salts enable the film to accommodate fast ion transport without significant resistance increase, allowing high ion conductivity in the electrolyte to translate to high battery performance
3Quantity of substance
If conventional electrolytic solution compositions are used to achieve high battery capacity, then decomposition reactions occur causing swollenness, but suppressing decomposition reactions reduces battery capacity characteristics
Solution Approach 1:
The metal salts with unsaturated carbon bonds act as intermediary substances that mediate between the anode and the electrolytic solution. They form a protective interface layer that prevents direct harmful interactions between the anode active material and the electrolyte, suppressing decomposition reactions and gas generation that cause swollenness, while still allowing efficient ion transport for high battery capacity
Solution Approach 2:
By introducing metal salts with specific unsaturated carbon bond structures, the chemical composition and properties of the protective film are changed. This enables the film to be more selective and protective, suppressing decomposition reactions and gas generation that cause swollenness, while maintaining or enhancing battery capacity characteristics
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 use of metal salts with unsaturated carbon bonds improves battery capacity, cycle stability, and reduces swollenness, maintaining high ion conductivity and preventing resistance rise during charge and discharge cycles.
Implementation Method 1
Incorporating a metal salt with an unsaturated carbon bond into the anode or electrolytic solution to form a stable protective film on the anode surface
Data Source
AI summary
A secondary battery includes a cathode, an anode, and an electrolytic solution. The anode or the electrolytic solution, or both contain a metal salt including an unsaturated carbon bond.