Solid-State Battery Anode Protection Layer for Side-Reaction Isolation
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Solution Overview
Problem
Existing all solid-state batteries face challenges in preventing side reactions between the negative current collector and the electrolyte, which can lead to corrosion and reduced battery performance.
Innovation Solution
The implementation of a negative electrode protection layer, composed of materials like fluorine adhesives, acryl adhesives, or silicon adhesives, between the negative current collector and the negative electrode coating layer, effectively isolates the current collector from the electrolyte, thereby preventing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a negative electrode protection layer is introduced to prevent side reactions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a negative electrode protection layer as an intermediary component between the negative current collector and the negative electrode coating layer. This protection layer acts as a mediator that prevents direct contact and side reactions between the current collector and electrolyte, thereby improving battery reliability and cycle-life without fundamentally changing the electrode architecture.
Solution Approach 2:
The negative electrode is segmented into distinct functional layers: a negative current collector, a negative electrode protection layer, and a negative electrode coating layer. This segmentation allows each layer to perform its specific function independently, with the protection layer specifically tasked with preventing side reactions, thus improving reliability while maintaining structural organization.
2Reliability
If a protection layer is added to suppress side reactions, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a thickness range for the negative electrode protection layer (0.1 μm to 30 μm) to optimize its protective function. By defining appropriate parameter ranges rather than requiring exact thickness values, the patent balances corrosion prevention effectiveness with manufacturing feasibility, reducing the stringency of precision requirements while maintaining reliability improvements.
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 configuration significantly suppresses the side reaction between the negative current collector and the electrolyte, enhancing the battery's cycle-life characteristics and maintaining energy density.
Implementation Method 1
The negative electrode protection layer may be an insulation layer... effectively isolates the current collector from the electrolyte, thereby preventing side reactions
Implementation Method 2
The negative electrode protection layer may include a fluorine adhesive, an acryl adhesive, a cyanoacrylate adhesive, a rubber adhesive, a polyurethane adhesive, a silicon adhesive, or a combination thereof
Data Source
AI summary
An all solid-state battery includes a negative electrode including a negative electrode protection layer, a negative electrode coating layer, and a negative current collector between the negative electrode protection layer and the negative electrode coating layer; a positive electrode; and a solid electrolyte layer between the negative electrode and the positive electrode.