Magnesium Cathode Composite Oxide for Ion Mobility
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Solution Overview
Problem
Magnesium secondary batteries face challenges due to strong interactions between divalent magnesium ions and anions in active materials, inhibiting smooth ion movement and electrode reactions.
Innovation Solution
A cathode active material with a composite oxide structure represented by MgxMyO2, where M is Ni, Co, Mn, Ti, V, Cr, Fe, Cu, or Mo, with 1.0<x and y<1.0, designed to increase magnesium ion mobility through the halite structure, allowing percolative conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cathode active materials are used in magnesium secondary batteries, then the battery structure can be formed, but strong interactions between divalent magnesium ions and anions inhibit smooth ion movement and electrode reactions
Solution Approach 1:
The patent introduces a monovalent anion (such as Cl-, Br-, I-) as an intermediary substance in the cathode active material. This monovalent anion acts as a mediator that reduces the strong interaction between divalent magnesium ions and the original anions, thereby facilitating smooth ion movement and improving electrode reaction performance while maintaining structural stability
Solution Approach 2:
The patent changes the ionic composition parameters by incorporating monovalent anions with different charges compared to the original divalent anions. This parameter change in anion charge creates a more favorable electrostatic environment for divalent magnesium ion transport, reducing harmful interactions and enhancing battery performance
2Productivity
If the cathode active material uses composite oxide structure MgxMyO2 with x>1.0 and y<1.0, then discharge capacity is enhanced through percolative conduction pathways, but the crystal structure and composition control become more complex
Solution Approach 1:
The patent systematically varies the compositional parameters x and y in the MgxMyO2 structure, where x>1.0 and y<1.0, to optimize the concentration of percolative conduction pathways. By changing these stoichiometric parameters, the patent enhances discharge capacity while establishing clear compositional guidelines that aid in precise manufacturing control
Solution Approach 2:
The patent creates a composite oxide material MgxMyO2 that combines multiple metal elements in specific ratios. This composite structure provides both the enhanced discharge capacity through percolative conduction and a well-defined compositional framework that facilitates precise manufacturing by specifying exact elemental proportions
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 solution enhances discharge capacity by creating pathways for magnesium ions, resulting in improved electrode reactions and battery performance.
Implementation Method 1
The composite oxide has been designed so that it has the halite structure and contains more magnesium than in the stoichiometric composition. This statistically increases the percentage of magnesium atoms that come close to each other in the cathode active material, helping paths to be created for magnesium ions to move through. That is, this cathode active material allows for percolative conduction of magnesium ions.
Data Source
AI summary
A cathode active material for magnesium secondary batteries contains a composite oxide represented by the formula MgxMyO2, where M is at least one selected from the group consisting of Ni, Co, Mn, Ti, V, Cr, Fe, Cu, and Mo; 1.0<x, and y<1.0.