Amorphous MgxSiOyNz Solid Electrolyte for Magnesium Ion Conductivity
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Solution Overview
Problem
Magnesium secondary batteries face challenges in achieving high ionic conductivity due to the low diffusion of magnesium ions in solid electrolytes, which limits their practical application.
Innovation Solution
An amorphous solid electrolyte with a composition of MgxSiOyNz, where 1<x<2, 3<y<5, and 0≤z<1, is developed, featuring a structure with coordination polyhedra and magnesium ions, allowing for increased magnesium ion conductivity and stability through deficits in atoms, thereby enhancing ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte with magnesium ion conductivity is used, then ionic conductivity is improved, but magnesium ion diffusion remains low
Solution Approach 1:
The patent changes the physical state parameter of the solid electrolyte from crystalline to amorphous. This parameter change creates a non-periodic atomic structure with continuous random networks, which provides more favorable pathways for magnesium ion diffusion while maintaining high ionic conductivity. The amorphous structure reduces activation energy for ion transport compared to crystalline structures.
Solution Approach 2:
The patent employs a composite material system with specific composition ratios (1<x<2, 3<y<5, 0≤z<1) combining magnesium, silicon, oxygen, and nitrogen elements. This composite approach creates a synergistic effect where the specific stoichiometry optimizes both the stability of the amorphous structure and the conductivity pathways for magnesium ions, resolving the contradiction between stability and ion diffusion.
2Volume of moving object
If thin-film solid electrolyte is used, then device integration is improved, but pinholes form reducing reliability
Solution Approach 1:
The patent changes the structural parameter from crystalline to amorphous, which eliminates grain boundaries and crystalline defects that typically cause pinhole formation. The amorphous structure provides uniform density and continuous coverage even in thin-film form, maintaining reliability while enabling thin-film integration for compact device design.
Data Source
AI summary
A solid electrolyte has a composition represented by the formula: MgxSiOyNz, where 1<x<2, 3<y<5, and 0≤z<1. The solid electrolyte is an amorphous material.