Cu-Cu2O Positive Electrode Composition for Capacity Retention
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Solution Overview
Problem
The existing fluoride ion batteries face challenges with low capacity retention ratio due to volume changes in the positive electrode active material layer during charge and discharge cycles.
Innovation Solution
A positive electrode active material comprising Cu particles and Cu2O particles in a specific mass ratio, preferably 30/70 to 70/30, is used to enhance both initial discharge capacity and capacity retention ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the positive electrode active material layer is used in fluoride ion battery, then the initial discharge capacity is achieved, but the capacity retention ratio becomes low due to volume change during charge and discharge
Solution Approach 1:
The patent applies composite materials by combining Cu particles and Cu2O particles in a specific mass ratio (30/70 to 70/30) to create a positive electrode active material that achieves both high initial discharge capacity and improved capacity retention ratio. The composite structure allows Cu to provide high capacity while Cu2O mitigates volume expansion issues during charge-discharge cycles.
Solution Approach 2:
The patent changes the compositional parameters of the positive electrode active material by controlling the mass ratio of Cu to Cu2O particles within a specific range (30/70 to 70/30). This parameter optimization enables the material to simultaneously achieve high initial discharge capacity and maintain structural stability for good capacity retention.
2Quantity of substance
If Cu particles are used to achieve high initial discharge capacity, then the capacity retention ratio deteriorates due to volume expansion during charge and discharge
Solution Approach 1:
The patent uses composite materials by combining Cu particles (which provide high discharge capacity) with Cu2O particles (which have better volume stability). The specific mass ratio range of 30/70 to 70/30 optimizes the balance between achieving high initial capacity and maintaining volume stability during charge-discharge cycles.
Solution Approach 2:
The patent applies local quality by having different components (Cu and Cu2O particles) perform different functions within the composite material. Cu particles primarily contribute to high discharge capacity while Cu2O particles provide structural stability and volume control, with each component optimized for its specific role.
Data Source
AI summary
Provided is a positive electrode active material for use in a fluoride ion secondary battery. The positive electrode active material includes Cu particles and Cu2O particles. Provided is a fluoride ion secondary battery comprising a positive electrode material mixture layer comprising a positive electrode active material. The positive electrode active material includes Cu particles and Cu2O particles.