Electrochemical Cell Polymer Protective Layers for Ion Uniformity
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Solution Overview
Problem
Existing electrochemical cells face inefficiencies due to uneven surface redeposition of metal ions during charge/discharge cycles, leading to poor performance and reduced cycle life, despite various approaches for forming electrodes and protective layers.
Innovation Solution
The development of polymer layers formed through the copolymerization of olefinic monomers with electron withdrawing and donating groups, which are integrated into the electrochemical cells as protective layers or gel polymer electrolytes, enhancing ion conductivity and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective layers are used on electrodes, then some protection is provided, but uneven surface redeposition occurs leading to poor cell performance
Solution Approach 1:
The patent changes the chemical parameters of the protective layer by incorporating electron-withdrawing groups (e.g., fluorine, cyano, carbonyl) and electron-donating groups (e.g., alkoxy, amino) into the polymer structure. This alters the electronic properties and surface characteristics of the protective layer, enabling uniform metal ion redeposition and improving both cell performance and surface uniformity simultaneously
Solution Approach 2:
The patent creates composite polymer structures by copolymerizing monomers with different electronic properties (electron-withdrawing and electron-donating groups). This composite approach combines the benefits of both types of groups, providing enhanced protection against polysulfide reactions while maintaining uniform surface morphology for consistent metal deposition
2Reliability
If polymer layers are added to electrochemical cells, then protection and stability are improved, but device complexity increases
Solution Approach 1:
The patent designs polymer layers that perform multiple functions simultaneously: (1) protecting electrodes from polysulfide reactions, (2) preventing hydrolysis, (3) enabling uniform metal ion redeposition, and (4) providing mechanical stability. This multi-functionality reduces the need for multiple separate components, thereby limiting the increase in device complexity while achieving comprehensive protection and stability
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
These polymer layers improve the electrochemical cell's performance by maintaining uniformity, increasing ion diffusion rates, and extending the cell's lifespan through enhanced ion conductivity and stability against hydrolysis and polysulfide reactions.
Implementation Method 1
The polymer layer is formed from the copolymerization of an olefinic monomer comprising at least one electron withdrawing group and an olefinic comonomer comprising at least one electron donating group
Implementation Method 2
increasing ion diffusion rates
Data Source
AI summary
Electrode structures and electrochemical cells are provided. The electrode structures and/or electrochemical cells described herein may include one or more protective layers comprising a polymer layer and/or a gel polymer electrolyte layer. The polymer layer may be formed from the copolymerization of an olefinic monomer comprising at least one electron withdrawing group and an olefinic comonomer comprising at least one electron donating group. Methods for forming polymer layers are also provided.