Self-Standing Electrode Film Web for Easier Battery Electrode Handling
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Solution Overview
Problem
The manufacturing process of secondary batteries is complex and costly, and existing electrode materials, particularly positive active materials, are brittle and difficult to handle.
Innovation Solution
A novel electrode film rolled web is developed, composed of a mixture including an active material and a binder with specific content ratios of styrene butadiene rubber, polyvinylidene fluoride, and polycarboxylic acid polymer, which is self-standing and can be used without a current collector, allowing for simplified processing and improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positive active material is used to form an electrode film rolled web, then the electrochemical performance is improved, but the material becomes brittle and difficult to handle
Solution Approach 1:
The patent uses a composite binder system comprising styrene butadiene rubber (0.1-2.0 parts by mass), polyvinylidene fluoride (0.1-2.0 parts by mass), and polycarboxylic acid polymer (0.1-2.0 parts by mass) in combination with a positive active material. This composite material approach combines the electrochemical benefits of the active material with the mechanical flexibility and adhesion properties of the binder system, resolving the contradiction between electrochemical performance and handling ease.
2Manufacturing precision
If multistage processing is used to fabricate the electrode, then the electrode quality is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the functions of the current collector and the active material layer into a single integrated electrode film rolled web. The web itself serves as both the structural support and the electrochemically active component, eliminating the need for separate current collector and active material layer fabrication processes. This merging of functions reduces manufacturing complexity while maintaining electrode quality.
Solution Approach 2:
The patent extracts and eliminates the current collector component from the traditional electrode structure. By designing the electrode film rolled web to function without a separate current collector, the invention simplifies the manufacturing process by removing the coating and drying steps associated with applying active material to a current collector substrate.
Data Source
AI summary
The present invention relates to a novel electrode film rolled web for use as a material for an electrode, an electrode, an electrode laminate, an electrochemical device, and an apparatus for which such an electrode film rolled web is used as a material.