Solid-State Battery Anode Tab Protection Against Sulfide Corrosion
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Solution Overview
Problem
Sulfide-based electrolytes in solid-state batteries react with copper foil current collectors, leading to corrosion and mechanical impairment, which affects production yield and performance.
Innovation Solution
A transparent tape is applied on both sides of the exposed copper tab area in the anode, covering the reaction zone, and is removed before welding to prevent contact with sulfide-based electrolytes, thereby preventing mechanical impairment and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the copper foil current collector is exposed to sulfide-based electrolyte material, then the battery structure is simplified and manufacturing is easier, but the copper foil undergoes corrosion and mechanical impairment
Solution Approach 1:
A tape is introduced as an intermediary component between the copper foil current collector and the sulfide-based electrolyte material. This tape prevents direct contact and chemical reaction between the copper and sulfide, eliminating corrosion while maintaining the simplicity of the battery structure and manufacturing process.
Solution Approach 2:
The tape used to protect the copper foil is a low-cost, single-use component that is applied during manufacturing and removed before final battery assembly. This disposable element provides effective protection during critical manufacturing stages without adding permanent complexity to the battery structure.
2Reliability
If the exposed copper area is covered with tape during manufacturing, then corrosion is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
A thin, flexible tape is used to cover the exposed copper areas. This tape can be easily applied and removed without requiring complex equipment or processes, adding minimal complexity while providing effective corrosion protection during manufacturing.
3Reliability
If the tape is left on the copper foil throughout the battery lifecycle, then corrosion protection is continuous, but the tape interferes with welding operations and terminal tab attachment
Solution Approach 1:
The tape is applied preliminarily during manufacturing to protect the copper foil from corrosion. It is designed to be temporary, removed before welding operations to allow proper attachment of terminal tabs, thus providing protection when needed without interfering with subsequent manufacturing steps.
Data Source
AI summary
A solid-state battery has an anode including a metal foil current collector and an anode composite on the metal foil current collector such that the metal foil current collector defines an exposed area free of the anode composite. The solid-state battery also has a separator laminated on the anode composite and a tape attached on both sides of the anode, covering the exposed area.