CuV2O6 Cathode Structure for Reversible Magnesium-Ion Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in multivalent-ion batteries, particularly magnesium-ion batteries, is the poor diffusion kinetics of multivalent ions in solid phases at room temperature, limiting the development of high-performance cathode materials that can store Mg reversibly at high voltage and capacity.
Innovation Solution
The use of CuV2O6 as a cathode material in magnesium-ion batteries, synthesized through a hydrothermal method, which enables a reversible specific capacity of 100 mAh/g at 2.1 V, doubling the energy density of existing Chevrel compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multivalent-ion batteries use conventional cathode materials, then structural stability is maintained, but ion diffusion kinetics are poor at room temperature
Solution Approach 1:
The patent changes the crystal structure parameters of the cathode material by selecting CuV2O6 with a specific hexagonal structure that provides open channels and pathways for Mg2+ ion diffusion. This structural parameter change enables fast ion transport while maintaining structural integrity during cycling.
Solution Approach 2:
The patent employs a composite cathode material consisting of CuV2O6 combined with conductive carbon and binder materials. This composite structure enhances both the ion diffusion kinetics through the CuV2O6 framework and the structural stability through the supporting carbon matrix.
2Quantity of substance
If sulfide- and selenide-based cathodes are used, then specific capacity exceeds 100 mAh/g, but working voltage is limited
Solution Approach 1:
The patent changes the chemical composition parameters by selecting CuV2O6, which has a different electrochemical potential compared to sulfide and selenide materials. This compositional change achieves both high specific capacity (100 mAh/g) and high working voltage (2.1 V vs. Mg2+), overcoming the voltage limitation of conventional materials.
3Use of energy by moving object
If high-capacity cathode materials are explored, then energy content increases, but reversible Mg storage at high voltage becomes challenging
Solution Approach 1:
The patent optimizes the electrochemical parameters of the cathode material by selecting CuV2O6, which exhibits favorable redox potentials and electronic structure. This enables reversible Mg2+ insertion/extraction at high voltage (2.1 V) while maintaining high capacity, achieving both high energy content and reliable reversibility.
Solution Approach 2:
The patent uses a hydrothermal synthesis method to produce CuV2O6 cathode material, which provides a cost-effective and scalable approach to creating high-performance cathodes with optimized properties for reversible Mg storage.
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
CuV2O6 provides a high energy density of 210 Wh/kg with structural stability during charging and discharging, making it a promising candidate for next-generation magnesium-ion batteries.
Implementation Method 1
CuV2O6 provides a reversible specific capacity of 100 mAh/g with an average voltage of 2.1 V vs. Mg2+
Implementation Method 2
The CuV2O6 cathode may provide a reversible specific capacity of 100 mAh/g with an average voltage of 2.1 V vs. Mg2+
Implementation Method 3
the poor diffusion kinetics of multivalent ions in solid phases at room temperature
Implementation Method 4
synthesized through a hydrothermal method
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Systems and methods are provided for a magnesium-ion battery (1200). The magnesium-ion battery (1200) includes an anode (1206), a cathode (1202), and an electrolyte in fluid contact with the anode (1206) and cathode (1202). The cathode includes CuV2O6 and the electrolyte includes magnesium ions (1208).