Solid Electrolyte Buffer Layer for Battery Separator Protection
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Solution Overview
Problem
Current batteries with metal negative electrodes using solid electrolytes face issues such as internal shorts due to metal deposition causing mechanical stress on the separator, leading to performance loss and safety concerns.
Innovation Solution
A solid electrolyte design featuring a first and second solid electrolyte layer with different surfaces, where the second surface is less favorable for metal deposition, creating a buffer region between the metal negative electrode and the separator to prevent stress and internal shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal deposition is allowed on the solid electrolyte surface, then high energy density is achieved, but mechanical stress on the separator increases leading to performance loss
Solution Approach 1:
The solid electrolyte provides localized metal deposition on its deposition-friendly surface while maintaining a deposition-resistant surface that protects the separator. This spatial differentiation allows high energy density through metal storage without transferring mechanical stress to the separator, preserving separator integrity.
Solution Approach 2:
The solid electrolyte acts as an intermediary between the metal negative electrode and the separator. It accepts metal deposition on one surface while preventing stress transmission to the separator through its structurally stable composition, thus protecting separator integrity while enabling high energy density.
2Ease of manufacture
If a uniform solid electrolyte composition is used, then manufacturing is simplified, but metal deposition occurs near the separator causing performance degradation
Solution Approach 1:
The solid electrolyte incorporates local compositional or structural variations at its surfaces while maintaining overall manufacturing feasibility. One surface is designed with properties favorable for metal deposition while the other surface resists deposition, preventing performance degradation near the separator while keeping the manufacturing process practical.
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
This design effectively prevents metal deposition near the separator, reducing mechanical stress and enhancing the robustness and safety of the battery by directing metal deposition towards the current collector, thus improving the structural integrity and performance of the battery.
Implementation Method 1
the first solid electrolyte and the second solid electrolyte each have an ionic conductivity effective for a deposition metal
Implementation Method 2
the first solid electrolyte and the second solid electrolyte each have an ionic conductivity effective for a deposition metal
Data Source
AI summary
A solid electrolyte for a negative electrode of a secondary battery includes a first solid electrolyte having a first surface and a second solid electrolyte on the first solid electrolyte and having a second surface. The first solid electrolyte and the second solid electrolyte each have an ionic conductivity effective for a deposition metal, and the first surface and the second surface are different in composition, structure, or both. An electrode assembly and an electrochemical cell including the solid electrolyte and method for the manufacture thereof are also described.