Active Material Composite Coating for Stable Resistance After Cycling
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Solution Overview
Problem
Conventional active material composites exhibit a significant increase in resistance after cycle testing, indicating a need for improved durability and stability.
Innovation Solution
An active material composite is developed with a coating layer comprising a phosphoric acid compound and elements of C and F, which covers at least a portion of the active material particle surface, enhancing durability and resistance retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the surface of active material particles using conventional methods, then the surface coverage is achieved, but the resistance increase rate after cycle testing remains high
Solution Approach 1:
The coating layer is constructed as a composite material containing both a phosphoric acid compound and fluorine elements, combining the benefits of acid-base neutralization (from phosphoric acid compound) and stable surface coverage (from fluorine-containing species). This composite approach resolves the contradiction by achieving low resistance increase rate through synergistic effects of multiple components rather than relying on a single complex coating formulation.
Solution Approach 2:
The invention changes the chemical composition parameters of the coating layer by specifically incorporating phosphoric acid compounds and fluorine elements. This parameter change transforms the coating properties to achieve superior resistance stability after cycling, resolving the contradiction between reliability improvement and manufacturing simplicity.
2Duration of action of stationary object
If the coating layer includes phosphoric acid compound and C-F bonds, then durability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The coating layer employs a composite structure combining phosphoric acid compounds with fluorine-containing species, creating a multi-functional coating that enhances durability through synergistic effects. The phosphoric acid compound provides acid-base neutralization capability while fluorine elements contribute to stable surface coverage and resistance to degradation during cycling, achieving extended cycle life without requiring overly complex manufacturing processes.
3Reliability
If conventional coating materials are used, then the coating process is simple, but the resistance increase rate after cycling is significant
Solution Approach 1:
The invention modifies the chemical composition parameters of the coating layer by incorporating phosphoric acid compounds and fluorine elements. This parameter change fundamentally improves resistance stability after cycling by introducing materials with superior chemical stability and surface passivation properties, resolving the contradiction between reliability enhancement and manufacturing 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 active material composite demonstrates a small resistance increase rate after cycle testing, indicating improved durability and stability due to the phosphoric acid compound and C-F bond in the coating layer.
Implementation Method 1
the coating layer comprises a phosphoric acid compound, and elements constituting the coating layer comprise C and F
Implementation Method 2
a coating layer is formed on a surface of active material particles
Data Source
AI summary
An active material composite having durability after a cycle test is disclosed. The active material composite of the present disclosure has an active material particle and a coating layer, wherein the coating layer covers at least a portion of the surface of the active material particle, the coating layer contains a phosphoric acid compound, and elements constituting the coating layer contain C and F.