Mo2Ga2C MAX-Phase Anode for Lithium-Ion Batteries
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Solution Overview
Problem
Current MAX-phase materials, particularly those with the Mn+1AXn structure, lack diversity in Mo-containing compositions, limiting their applications and properties, especially in electrochemical applications such as lithium-ion batteries.
Innovation Solution
Development of new MAX-phase materials with the stoichiometry M2A2(CxNy), where x+y=1, specifically Mo2Ga2C, which features a simple hexagonal arrangement with two layers of Ga atoms between Mo2C layers, enhancing their electrochemical properties and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new Mo-containing MAX-phase compositions are developed, then electrochemical performance and material diversity are improved, but synthesis complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by modifying the stoichiometric ratios and structural arrangement of MAX-phase materials. Specifically, it develops new compositions with varying Mo content and A-layer configurations (e.g., Mo2Ga2C, Mo3Ga3C2) to optimize electrochemical performance for lithium-ion battery anodes while managing synthesis complexity through systematic compositional variation.
2Adaptability or versatility
If new MAX-phase compositions with diverse stoichiometry are created, then material properties and applications are enhanced, but structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the MAX-phase structure into distinct layers with specific functions: M-layers (Mo) providing structural framework and electrical conductivity, A-layers (Ga) providing spacing and chemical stability, and X-layers (C) providing structural integrity. This layered segmentation allows independent optimization of each component's contribution to overall material properties.
Solution Approach 2:
The patent applies composite materials principles by creating nanolaminated structures that combine different elemental layers (Mo, Ga, C, N) in specific sequences and ratios. These composite MAX-phase materials integrate the beneficial properties of individual elements: Mo for conductivity, Ga for stability, and C/N for structural strength, achieving enhanced overall performance.
Data Source
AI summary
The present invention is directed to crystalline solids having an empirical formula of M2A2X, wherein M is at least one Group IIIB, IVB, VB, or VIB metal, preferably Cr, Hf, Sc, Ti, Mo, Nb, Ta, V, Zr, or a combination thereof; wherein A is Al, Ga, Ge, In, Pb, or Sn, or a combination thereof; and each X is CxNy, where x+y=1. In some particular embodiments, the crystalline composition has a unit cell stoichiometry of Mo2Ga2C.