Layered Oxide Cathode Composition for High-Capacity Magnesium Batteries
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Solution Overview
Problem
Existing magnesium secondary batteries face challenges in achieving high capacity due to inefficiencies in magnesium ion extraction and insertion, particularly when the composite oxide in the positive electrode lacks sufficient anions, leading to structural instability during charge and discharge.
Innovation Solution
A positive-electrode active material comprising a composite oxide with a P2 layered structure and a crystal structure belonging to the space group P63/mmc, where M1 is sodium or potassium and M2 is nickel, manganese, cobalt, or iron, ensuring efficient magnesium ion conductivity and maintaining structural integrity during charge and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the composite oxide lacks sufficient anions to achieve high capacity, then the battery capacity can be increased, but the structural stability during charge and discharge deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the composite oxide by incorporating alkali metals (M1) and transition metals (M2) in specific ratios defined by parameters x and y in the formula M1xM2yO2. This compositional parameter optimization allows achieving high capacity while maintaining structural stability through balanced stoichiometry
Solution Approach 2:
The patent creates a composite oxide material combining multiple elements (alkali metal M1, transition metal M2, and oxygen) with a specific layered structure. This composite material approach enables simultaneous achievement of high capacity and structural stability by leveraging the synergistic effects of different elements in a coordinated atomic arrangement
2Productivity
If the composite oxide structure is optimized for magnesium ion conductivity, then the extraction and insertion efficiency of magnesium ions improves, but the complexity of achieving the precise crystal structure increases
Solution Approach 1:
The patent applies local quality by creating a P2 layered structure with space group P63/mmc that has specific local atomic arrangements optimized for magnesium ion transport. The layered structure provides distinct pathways and sites (indicated by the P2 notation) that facilitate efficient magnesium ion extraction and insertion while maintaining overall structural order
Solution Approach 2:
The patent specifies precise crystallographic parameters including the space group P63/mmc and P2 layered structure to optimize magnesium ion conductivity. These structural parameter changes create favorable conditions for ion transport without requiring overly complex structures, achieving efficient magnesium ion extraction and insertion
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 proposed solution enhances the capacity of magnesium secondary batteries by facilitating easy extraction and insertion of magnesium ions, maintaining the composite oxide's layered structure, and improving conductivity, resulting in a higher capacity compared to existing technologies.
Implementation Method 1
ensuring efficient magnesium ion conductivity and maintaining structural integrity during charge and discharge
Data Source
AI summary
A positive-electrode active material for a magnesium secondary battery contains a composite oxide represented by the following composition formula:M1xM2yO2,where M1 is sodium, M2 is nickel and manganese, and 0<x+y≤2.