Zinc Battery Negative Electrode Structure for Lower Self-Discharge
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Solution Overview
Problem
Zinc batteries suffer from self-discharge due to the decomposition of metallic zinc in the negative electrode mixture layer, leading to reduced performance and capacity retention over time.
Innovation Solution
A negative electrode for zinc batteries is designed with a plate-like core member and a mixture layer containing zinc particles, where the particle size distribution is optimized to maintain a specific ratio with the layer thickness, minimizing surface area contact and preventing damage to the core member, thus suppressing self-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metallic zinc is used in the negative electrode mixture layer, then the battery capacity is improved, but self-discharge occurs due to local battery reaction with the core member
Solution Approach 1:
A plating layer is introduced as an intermediary between the metallic zinc particles and the core member. This plating layer acts as a mediator that prevents direct contact and local battery reaction between zinc and the core member, thereby suppressing self-discharge while maintaining the high capacity benefits of metallic zinc
Solution Approach 2:
The plating layer serves as a sacrificial protective barrier that prevents the harmful interaction between zinc and the core member. By providing this disposable protective interface, the system eliminates self-discharge without requiring fundamental changes to the zinc-based electrode structure
2Strength
If the negative electrode core member surface is highly deformed, then the mixture layer adhesion is improved, but the number of deformed areas increases causing higher self-discharge
Solution Approach 1:
The invention applies local quality by controlling the distribution and characteristics of deformed areas on the core member surface. Rather than uniformly deforming the entire surface, the patent specifies that deformed areas should occupy 20% or less of the total surface area, creating localized adhesion points while minimizing overall self-discharge pathways
Solution Approach 2:
The invention changes the parameter of deformed area coverage from a high value (conventional) to 20% or less. This parameter change optimizes the balance between adhesion strength (provided by localized deformations) and self-discharge suppression (achieved by reducing overall deformed area coverage)
Data Source
AI summary
A negative electrode for a zinc battery is disclosed. The negative electrode comprises: a plate-like negative electrode core member; and a negative electrode mixture layer formed on at least one main surface of the negative electrode core member. The negative electrode mixture layer contains a negative electrode mixture. The negative electrode mixture includes zinc particles formed from at least one of zinc and a zinc alloy. On the at least one main surface of the negative electrode core member, a number of deformed areas in which a change in a length in a thickness direction of the negative electrode core member with respect to a reference exceeds 50 μm is 2.4 or less per square millimeter.