Copper-Barium Calcium Fluoride Cathode for Higher Fluoride-Ion Capacity
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Solution Overview
Problem
Fluoride-ion secondary batteries have limited charge-discharge capacity, which hinders their energy efficiency and performance.
Innovation Solution
A positive electrode active material composed of a copper-fluoride composite material with the formula BaxCa1-xF2, where x is between 0.2 and 0.8, is developed, enhancing fluoride-ion conductivity and charge-discharge capacity through an aerosol process, and integrated into a fluoride-ion secondary battery with a porous structure for improved electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional fluoride composite material is used in the positive electrode, then the battery structure is simple, but the charge-discharge capacity is limited
Solution Approach 1:
The patent applies composite materials by combining copper with fluoride (BaxCa1-xF2) to create a fluoride composite material for the positive electrode. This composite structure enables significantly higher charge-discharge capacity compared to conventional single-material electrodes, directly resolving the contradiction between capacity improvement and material complexity.
2Reliability
If the fluoride composite material is densified to improve conductivity, then fluoride-ion conductivity increases, but the porous structure for electrochemical reactions is reduced
Solution Approach 1:
The patent applies local quality by creating a hierarchical structure where fluoride composite material particles are densely packed within pores of a porous conducting oxide skeleton. This local differentiation allows high-density regions (for conductivity) to coexist with porous regions (for electrochemical reactions), resolving the contradiction between conductivity and reaction efficiency.
Solution Approach 2:
The patent uses composite materials by combining fluoride composite material with porous conducting oxide in a specific configuration. The fluoride composite provides high ionic conductivity while the porous oxide skeleton maintains structural porosity, enabling both high conductivity and efficient electrochemical reactions simultaneously.
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 copper-fluoride composite material significantly increases the charge-discharge capacity of fluoride-ion secondary batteries, maintaining performance even at low temperatures, as demonstrated by higher fluoride-ion conductivity and charge-discharge curves.
Implementation Method 1
The fluoride composite material may be a product produced by an aerosol process
Data Source
AI summary
Provided is a positive electrode active material including a fluoride composite material including a composite of copper and a fluoride represented by the formula:BaxCa1-xF2 wherein x is 0.2 or more and 0.8 or less.