Capacitor Electrode Oxyhydroxide Protective Layer
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Solution Overview
Problem
Capacitors used in vehicles and construction machines face challenges in reducing internal resistance and corrosion, particularly due to inadequate adhesion between current collectors and polarizing electrode layers, leading to increased resistance and potential corrosion from electrolytic solutions.
Innovation Solution
The electrode structure includes a current collector with a protective oxyhydroxide layer and an anchor coat layer containing conductive particles, which enhances adhesion and prevents corrosion, thereby reducing internal resistance and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an anchor coat layer is provided between the current collector and polarizing electrode layer to improve adhesion, then the joining strength is improved, but the internal resistance is not sufficiently reduced
Solution Approach 1:
A protective layer is introduced as an intermediary between the current collector and the anchor coat layer. This protective layer serves as a mediator that prevents harmful interactions (corrosion) while maintaining the beneficial adhesion function of the anchor coat layer, thus resolving the contradiction between joining strength and internal resistance
Solution Approach 2:
The electrode structure uses a composite multi-layer configuration consisting of the current collector, protective layer, anchor coat layer, and polarizing electrode layer. Each layer has specific properties that contribute to overall performance, combining adhesion enhancement with corrosion protection to simultaneously improve joining strength and reduce internal resistance
2Device complexity
If the current collector is directly exposed to the electrolytic solution, then the structure is simple, but corrosion occurs due to pH changes and acid/alkali reactions
Solution Approach 1:
The protective layer acts as an intermediary barrier between the current collector and the electrolytic solution, preventing direct contact and thus protecting the current collector from corrosion caused by pH changes and acid/alkali reactions during charging/discharging cycles
Solution Approach 2:
The protective layer creates a chemically inert environment around the current collector, isolating it from the reactive electrolytic solution and preventing harmful chemical reactions, similar to how an inert atmosphere protects materials from oxidation or degradation
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
This configuration significantly reduces direct current resistance and corrosion, enhancing the reliability and performance of capacitors by improving adhesion and protecting against acid and alkali reactions.
Implementation Method 1
the surface of the current collector can be prevented from being subjected to corrosion by acid and alkali
Implementation Method 2
the anchor coat layer contains conductive particles
Implementation Method 3
adhesion between the current collector and the polarizing electrode layer can be improved
Implementation Method 4
the internal resistance is reduced
Data Source
AI summary
An electrode for capacitor includes a current collector having conductivity, a protective layer formed on the current collector, an anchor coat layer formed on the protective layer, and a polarizing electrode layer formed on the anchor coat layer. The protective layer contains an oxyhydroxide and the anchor coat layer contains conductive particles.