La-C Negative Electrode Composition for High-Capacity Fluoride Ion Cells
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Solution Overview
Problem
Existing fluoride ion batteries face challenges in achieving high charge-discharge capacity.
Innovation Solution
The use of La x C (1.00-x) as the negative electrode active material, where 0.00 < x < 1.00, along with a lanthanoid fluoride as the solid electrolyte, enables a fluoride ion battery to exhibit high charge-discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional negative electrode materials are used in fluoride ion batteries, then the battery structure is simple, but the charge-discharge capacity is insufficient
Solution Approach 1:
The patent employs composite negative electrode materials consisting of lanthanum (La) combined with carbon materials (graphite, amorphous carbon, or carbon nanotubes) in specific ratios. This composite structure enables the battery to achieve charge-discharge capacity of 300 mAh/g or greater by leveraging the synergistic effects of La and carbon, while maintaining structural stability during charge-discharge cycles.
Solution Approach 2:
The patent optimizes the compositional parameters of the negative electrode material by controlling the La-to-carbon ratio and the crystallinity of carbon. By adjusting these parameters, the battery achieves high charge-discharge capacity while managing the complexity of material composition through systematic parameter optimization.
2Quantity of substance
If high charge-discharge capacity is achieved through material composition optimization, then the battery performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for the negative electrode material composition (La combined with carbon materials in controlled ratios) and carbon crystallinity. By establishing these parameter specifications, the patent achieves high charge-discharge capacity while providing clear manufacturing guidelines that balance performance requirements with production feasibility.
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 results in a fluoride ion battery with a charge-discharge capacity of 300 mAh/g or greater, enhancing the battery's performance.
Implementation Method 1
The negative electrode active material of the fluoride ion battery has higher charge-discharge capacity than lanthanum alone. This is because the negative electrode active material has a higher potential than lanthanum alone and undergoes oxidation-reduction reaction at a more electropositive potential.
Implementation Method 2
a solid electrolyte layer comprising a solid electrolyte
Data Source
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AI summary
The present disclosure provides a fluoride ion battery comprising a negative electrode active material that can exhibit high charge-discharge capacity, as well as a method for producing it. The fluoride ion battery of the disclosure has LaxC(1.00-x) as the negative electrode active material, where 0.00 < x < 1.00. The production method of the disclosure includes discharging a fluoride ion battery precursor having LaxC(1.00-x) as the negative electrode active material, where 0.00 < x < 1.00, until the upper limit potential of the negative electrode reaches 2.5 to 3.5 V vs Pb/PbF2.