Copper Fluoride Nanocomposites for High Specific Capacity Electrodes
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Solution Overview
Problem
Current lithium-ion battery cells have limitations in energy density due to the low specific capacity and environmental concerns of existing electrode materials, with copper fluoride showing potential but not fully utilized due to poor material utilization and high costs.
Innovation Solution
The development of copper fluoride nanocomposites with conductive matrices, such as MoOxFz, to create nanostructures that enhance specific capacity and energy density, allowing for higher recharge and discharge rates while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional intercalation materials like LiCoO2 are used in positive electrodes, then acceptable cycling stability is achieved, but specific capacity is limited to around 150 mAh/g
Solution Approach 1:
The patent changes the electrochemical mechanism from intercalation to conversion reaction, fundamentally altering how lithium is stored. This parameter change enables copper fluoride to achieve specific capacities exceeding 400 mAh/g, more than doubling the capacity of conventional intercalation materials while maintaining cycling stability through proper nanocomposite design
Solution Approach 2:
The patent creates composite materials by combining copper fluoride nanoparticles with conductive carbon matrices. This composite structure solves the inherent problems of pure copper fluoride by providing electrical conductivity pathways while maintaining the high capacity conversion reaction, achieving both high specific capacity and acceptable cycling stability
2Quantity of substance
If copper fluoride is used as electrode material, then theoretical specific capacity exceeds 500 mAh/g, but poor material utilization and high costs limit practical application
Solution Approach 1:
The patent segments copper fluoride into nanoparticle form with sizes controlled in the nanometer range. This segmentation dramatically increases the surface area to volume ratio, improving electrolyte access and lithium ion diffusion pathways. The result is enhanced material utilization where a much higher percentage of the copper fluoride actively participates in electrochemical reactions, realizing the theoretical capacity potential
Solution Approach 2:
The patent introduces conductive carbon as an intermediary material that mediates between the copper fluoride active material and the electrolyte. This carbon matrix provides electrical conductivity pathways, facilitates electron transport, and improves overall material utilization by ensuring efficient charge transfer throughout the electrode structure
3Quantity of substance
If higher capacity materials are pursued to increase energy density, then specific capacity improves, but environmental compatibility and safety deteriorate
Solution Approach 1:
The patent employs abundant, environmentally benign materials - copper, fluoride, and carbon - that are inexpensive and non-toxic. These materials can be sourced from common precursors and processed using straightforward methods, providing a sustainable alternative to rare earth elements and toxic metals while achieving superior specific capacity
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 nanocomposites demonstrate a significant increase in specific capacity, exceeding 400% that of current LiCoO2 intercalation compounds, achieving high energy density and improved environmental compatibility.
Implementation Method 1
a new metal fluoride conversion process positive electrodes resulting in a major improvement in specific capacity relative to current state of the art. Badway et al. reported>90% recovery of the FeF3 theoretical capacity (>600 mAh/g mAh/g) in the 4.5-1.5 V region through reversible conversion
Implementation Method 2
occlusion and intercalation materials, such a carbonaceous compounds, layered transition metal oxide and three dimensional pathway spinels have proved to be particularly well-suited to such applications
Data Source
AI summary
The present invention relates to primary and secondary electrochemical energy storage systems, particularly to such systems as battery cells, which use materials that take up and release ions as a means of storing and supplying electrical energy.