Electrode Sheet Coating Structure for Water-Based Battery Recycling
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Solution Overview
Problem
The recycling of spent lithium-ion battery electrode sheets is hindered by the use of strong acids or alkalis that damage or contaminate the current collector and active material layer, reducing recycling quality.
Innovation Solution
An electrode sheet design with a primer layer and edge coating layer, each using water-based binders of different hydrophilicity and hydrophobicity, allows for staged separation in water, preventing mutual contamination and enabling efficient recycling without chemical reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong acid or strong alkali is used for recycling electrode sheets, then the separation efficiency is improved, but the current collector and active material layer are damaged or contaminated
Solution Approach 1:
The electrode sheet is divided into multiple functional layers: a primer layer on the current collector, an active material layer on the primer layer, and an edge coating layer on the current collector. This segmentation allows selective separation during recycling - the primer layer can be removed first to protect the current collector, while the active material layer remains intact for recovery
Solution Approach 2:
The primer layer acts as an intermediary between the current collector and active material layer. It provides a controlled adhesion interface that allows the active material to be firmly attached during battery operation but enables clean separation during recycling without damaging either the current collector or active material
2Ease of manufacture
If traditional recycling methods are used, then the recycling process is simple, but the recycling quality is reduced due to contamination
Solution Approach 1:
The primer layer is pre-applied to the current collector before the active material layer is deposited. This preliminary action creates a controlled interface that enables subsequent easy separation during recycling, allowing the active material to be cleanly removed from the current collector without contamination while maintaining process 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 method ensures high purity recycling of active material and current collector, maintaining recycling quality and safety performance while being cost-effective and environmentally friendly.
Implementation Method 1
The electrode sheet is immersed in a first aqueous solution for 1 min to 5 min, to make the first water-based binder swell
Implementation Method 2
The electrode sheet in the first aqueous solution is sonicated, to separate a first composition from a second composition
Implementation Method 3
The second composition is immersed in a second aqueous solution for 1 min to 5 min, to make the second water-based binder swell
Implementation Method 4
The second composition in the second aqueous solution is sonicated, to separate the edge coating layer from the current collector in the second composition
Data Source
AI summary
An electrode sheet, a method for electrode sheet recycling, and an electrochemical apparatus are provided. The electrode sheet includes a current collector, a primer layer disposed on at least one surface of the current collector, an active material layer disposed on the primer layer, and an edge coating layer disposed on at least one surface of the current collector and connected to the primer layer. The primer layer includes a first water-based binder. The edge coating layer includes a second water-based binder and an inorganic material. After the electrode sheet is immersed in water for a first preset time at a first preset temperature, a first peel strength of the primer layer is less than a second peel strength of the edge coating layer.