Composite Separator Structure for Stable Anode Protection
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Solution Overview
Problem
Existing separators in electrochemical energy storage apparatuses struggle to provide prolonged protection for anode electrode sheets, leading to decreased cycling performance and capacity retention.
Innovation Solution
A composite separator with a sandwich design, featuring a first and second base film and an anode protection layer between them, which captures transition metal ions using a complexing agent, thereby preventing deposition and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a functional coating is arranged on a general separator to protect the anode electrode sheet, then anode protection is achieved, but the protection cannot be prolonged and the coating may detach during prolonged use
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure consisting of a base separator and an anode protection layer containing complexing agents. This composite structure combines the separation function of the base separator with the protective and ion-capturing functions of the anode protection layer, achieving both durability and prolonged protection performance
Solution Approach 2:
The patent uses complexing agents as intermediaries between the transition metal ions and the anode electrode sheet. These agents capture transition metal ions through complexation reactions, preventing the ions from directly damaging the anode while maintaining ion conductivity for normal battery operation
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 composite separator effectively prevents the anode protection layer from detaching, ensuring stable anode protection and improved performance of the electrochemical energy storage apparatus, including enhanced ion conductivity and reduced risk of short circuits.
Implementation Method 1
the complexing agent is selected from at least one of a phosphate complexing agent, a hydroxycarboxylate complexing agent, and an aminocarboxylate complexing agent... to capture transition metals through a complexation reaction between the complexing agent and the transition metal ions
Data Source
AI summary
The present application provides a composite separator, an electrochemical energy storage apparatus, and an electrical apparatus. The composite separator provided in a first aspect of the present application may comprise: a first base film and a second base film; and an anode protection layer located between the first base film and the second base film in a thickness direction of the composite separator, for capturing transition metal ions. The anode protection layer for capturing transition metal ions may be arranged between the first base film and the second base film to prevent the anode protection layer from falling off from an outer surface of the base films during prolonged use, so that the anode protection layer can have more stable anode protection effects in prolonged use of the electrochemical energy storage apparatus, and improve the application performance of the electrochemical energy storage apparatus.