Composite Anode Layer for Higher-Capacity Fluoride-Ion Batteries
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Solution Overview
Problem
Fluoride ion secondary batteries exhibit insufficient discharge capacity.
Innovation Solution
An anode layer comprising lanthanoid fluoride doped with alkaline earth metal fluoride and a carbon material, combined with a solid electrolyte of BaCaF4 or SrCaF4, forms a complex that enhances ion and electron conductivity, improving discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal lanthanoid sheet is used as an anode current collector with lanthanoid fluoride as anode active material, then the battery structure is simple and manufacturing is easy, but the discharge capacity is insufficient
Solution Approach 1:
The patent uses composite materials by combining lanthanoid fluoride doped with alkaline earth metal fluoride and carbon material in a specific mass ratio (1:0.01 to 1:0.5). This composite structure improves electron conductivity while maintaining the low defluorination potential of lanthanoid fluoride, thereby increasing discharge capacity without complicating the manufacturing process
Solution Approach 2:
The patent changes the chemical composition parameters by doping lanthanoid fluoride with alkaline earth metal fluoride at controlled ratios. This parameter optimization enhances the electrochemical performance and discharge capacity while keeping the anode structure simple and easy to manufacture
2Use of energy by moving object
If lanthanoid fluoride is used as anode active material, then the defluorination potential is low, but the electron conductivity is insufficient leading to low discharge capacity
Solution Approach 1:
The patent creates a composite anode active material by combining lanthanoid fluoride (providing low defluorination potential) with carbon material (providing electron conductivity). The carbon material forms a conductive network that enables efficient electron transport while the lanthanoid fluoride maintains its favorable electrochemical potential, achieving both low defluorination potential and high discharge capacity
Solution Approach 2:
The carbon material acts as an intermediary that bridges the electron conductivity gap of lanthanoid fluoride. It forms a conductive matrix around the lanthanoid fluoride particles, facilitating electron transport to and from the active material without altering its low defluorination potential characteristic
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 anode layer significantly improves the discharge capacity of fluoride ion secondary batteries by optimizing ion and electron conductivity, while maintaining low defluorination potential.
Implementation Method 1
a solid electrolyte layer is disposed between a cathode layer and an anode layer
Implementation Method 2
the lanthanoid fluoride doped with the alkaline earth metal fluoride and the carbon material forming a complex
Data Source
AI summary
There is provided an anode layer including an anode active material, a conductive aid, and a solid electrolyte, the anode active material including a lanthanoid fluoride doped with an alkaline earth metal fluoride, the conductive aid including a carbon material, the solid electrolyte including at least one of BaCaF4 and SrCaF4, and the lanthanoid fluoride doped with the alkaline earth metal fluoride and the carbon material forming a complex. There is also provided a fluoride ion secondary battery including the anode layer, an electrolyte, and a cathode layer.