CeSF Cathode Material for High-Potential Fluoride Ion Batteries
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Solution Overview
Problem
Fluoride ion batteries have a lower battery voltage compared to Li ion batteries due to the lack of a cathode active material capable of being charged and discharged at high potentials, limiting their energy density and output.
Innovation Solution
A cathode active material comprising Ce, S, and F elements with a specific composition represented by CeSF, exhibiting a crystal phase with specific X-ray diffraction peaks, is used in fluoride ion batteries, enabling high potential charge and discharge capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional cathode active materials (CeFx, CuF2, PbF2) are used in fluoride ion batteries, then the battery can operate with basic performance, but the battery voltage remains low due to inability to charge and discharge at high potentials
Solution Approach 1:
The patent changes the chemical composition parameters of the cathode active material by incorporating Ce, S, and F elements in specific ratios (Ce: 30-70 wt%, S: 5-40 wt%, F: 5-40 wt%) to create a new material system that enables high potential charge-discharge operation, directly resolving the voltage limitation of conventional materials
Solution Approach 2:
The patent creates a composite cathode active material combining Ce, S, and F elements in a specific composition range, forming a new composite substance that exhibits high potential charge-discharge capability, thereby achieving high battery voltage while maintaining operational reliability
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 cathode active material allows fluoride ion batteries to achieve higher voltage and energy density by increasing both charge and discharge potentials without overvoltage-related changes, enhancing the battery's theoretical performance.
Implementation Method 1
a cathode active material used in a fluoride ion battery, the cathode active material comprising: a Ce element, a S element, and a F element; and a composition represented by CeSF
Implementation Method 2
a crystal phase having a peak at a position of 2θ=25.4°±0.5°, 31.2°±0.5°, 41.0°±0.5°, 45.0°±0.5°, and 52.6°±0.5° in an X-ray diffraction measurement using a CuKα ray
Data Source
AI summary
A main object of the present disclosure is to provide a cathode active material that is used in a fluoride ion battery and is capable of being charged and discharged at a high potential. The present disclosure achieves the object by providing a cathode active material used in a fluoride ion battery, the cathode active material comprising: a Ce element, a S element, and a F element; anda composition represented by CeSF.