Core-Shell Electrode Particles with Covalent Polymer Shells
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Solution Overview
Problem
Existing electrode materials in electrochemical cells face degradation due to the presence of water, leading to the formation of CO2 and other gases, which causes inflation and security issues, and current methods for preventing degradation, such as water removal or forming protective coatings, are either energy-intensive or impractical for industrial scale-up.
Innovation Solution
The development of electrode materials with a core-shell structure, where the core comprises electrochemically active material particles with hydroxyl groups and a polymer shell covalently grafted onto the surface, providing a protective layer that enhances stability against mechanical and chemical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water removal from cathode and anode is performed, then electrolyte degradation is prevented, but energy cost increases significantly
Solution Approach 1:
A protective coating is applied to the electrode surfaces before assembly, preemptively preventing water-related degradation reactions. This preliminary protective measure eliminates the need for post-assembly water removal processes, resolving the contradiction between electrolyte stability and energy consumption.
2Reliability
If a protective coating is formed on electrode surfaces, then electrolyte degradation is prevented, but manufacturing complexity increases
Solution Approach 1:
A thin polymer coating layer is applied to the electrode surfaces, providing protective functionality while maintaining manufacturing simplicity. The thin film structure prevents complex manufacturing processes while achieving the desired electrolyte stability, resolving the contradiction between reliability and manufacturing complexity.
3Stability of the object's composition
If polymer absorption on particle surface is used, then active material stability is improved, but mechanical resistance deteriorates
Solution Approach 1:
A composite structure is created by combining the active material particles with a polymer coating layer. This composite structure provides both chemical stability (preventing electrolyte degradation) and mechanical strength (resisting manufacturing manipulations), resolving the contradiction between stability and strength.
Solution Approach 2:
The polymer coating is applied specifically on the particle surface where protection is needed, rather than uniformly throughout the entire electrode. This localized application provides stability where required while maintaining the mechanical integrity of the bulk material, resolving the contradiction between stability and strength.
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 core-shell structure effectively prevents the undesirable reaction between the electrolyte and residual water, improving the retention capacity and stability of the electrode, reducing gas formation, and enhancing adhesion to the current collector, thus improving the durability and efficiency of electrochemical cells.
Implementation Method 1
the polymer is grafted on the surface of the particle by one or more covalent bond(s)
Data Source
AI summary
This application describes electrode materials and methods of producing them, the materials containing particles having a core-shell structure, wherein the shell of the core-shell particles comprises a polymer, the polymer being grafted on the surface of the core particle by covalent bonds. Electrodes and electrochemical cells containing these electrode materials are also contemplated, as well as their use.