Ether Polymer Electrode Coating for Stable Battery Interfaces
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Solution Overview
Problem
The interface performance of active substances in electrode plates is poor, leading to inadequate cycling and storage performance of battery cells.
Innovation Solution
A polymer, specifically an ether polymer, is applied to the electrode plates, forming a sheet structure that undergoes dynamic frequency scanning testing to achieve a certain elastic modulus and energy loss modulus curve slope, reducing molecular chain entanglement and enhancing solvent diffusion and interface stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polymer molecular chain entanglement is reduced to facilitate solvent diffusion, then the interface performance is improved, but the polymer dissolution risk increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the polymer molecular weight within 10,000-1,000,000 g/mol and adjusting the glass transition temperature to -100≤Tg≤50°C. These parameter optimizations enable the polymer to achieve appropriate chain mobility for solvent diffusion while maintaining sufficient entanglement to prevent dissolution, thus resolving the technical contradiction between interface performance and dissolution resistance
Solution Approach 2:
The patent employs composite materials by combining the ether polymer with electrolyte and active substance to form an integrated solid-liquid interface system. This composite structure allows the polymer to simultaneously provide protective layer formation, solvent locking, and interface stabilization, resolving the contradiction between facilitating diffusion and preventing dissolution
2Reliability
If the polymer forms a protective layer on active substance surface, then side reactions are reduced, but the complexity of the electrode plate structure increases
Solution Approach 1:
The patent applies universality by designing the ether polymer to perform multiple functions simultaneously: it forms a protective layer on the active substance surface, locks solvent molecules in situ, stabilizes the solid-liquid interface, and prevents polymer dissolution. This multi-functionality eliminates the need for separate components, thus improving cycling performance without significantly increasing structural complexity
Solution Approach 2:
The patent implements self-service by enabling the polymer to automatically form a protective layer on the active substance surface upon contact with the electrolyte. The polymer self-organizes and adheres to the active substance, creating a stable interface without requiring additional processing steps or complex structural designs, thereby improving reliability while maintaining simplicity
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 polymer improves the solid-liquid interface performance, reduces side reactions, and enhances the cycling and storage performance of battery cells by forming a protective layer on the active substance surface.
Implementation Method 1
the polymer to form a protective layer on the surface of an active substance, improving the solid-liquid interface performance
Implementation Method 2
the solvent molecules can be locked in situ in the polymer, the risk of dissolution of the polymer in the electrolyte can be reduced
Implementation Method 3
facilitating the diffusion of solvent molecules in an electrolyte between molecular chains
Data Source
AI summary
A polymer, an electrode plate, and a battery cell, battery, and electric apparatus related thereto are described. The polymer includes an ether polymer. The ether polymer is made into a sheet structure. The sheet structure undergoes dynamic frequency scanning testing at (Tm+20)° C. to obtain an elastic modulus G′-energy loss modulus G″ curve, where a slope of the elastic modulus G′-energy loss modulus G″ curve is K, 1<K<∞, and Tm° C. represents a melting temperature of the ether polymer. This application can improve the cycling performance and storage performance of the battery cell.