Crystallized Glass Electrolyte Composition for Higher Li-Ion Conductivity
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Solution Overview
Problem
Current oxide-based solid electrolytes for lithium ion batteries have low lithium ion conductivity, which is not comparable to sulfide-based solid electrolytes, and there is a need for an oxide-based solid electrolyte with higher lithium ion conductivity.
Innovation Solution
A glass ceramic composed of lithium (Li), an element M (zirconium (Zr), hafnium (Hf), tin (Sn), samarium (Sm), niobium (Nb), tantalum (Ta), tungsten (W), or molybdenum (Mo), phosphorus (P), oxygen (O), and optionally boron (B) or silicon (Si), with a monoclinic crystal structure peak at 2θ = 20° to 30° and a half width of 0.10° or more, produced through mixing, melting, cooling, pulverizing, and heat treatment to form a glass ceramic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based solid electrolyte is used instead of sulfide-based solid electrolyte, then environmental stability and ease of handling are improved, but lithium ion conductivity deteriorates
Solution Approach 1:
The invention uses a composite glass ceramic material containing Li-M-P-O crystalline phase embedded in a glass matrix. This composite structure combines the high environmental stability of oxide-based materials with enhanced lithium ion conductivity through the crystalline phase, achieving both improved reliability and reduced harmful effects.
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating specific elements (M = Zr, Hf, Sn, Sm, Nb, Ta, W, or Mo) and controlling the ratios of Li, P, and O. It also changes the physical state from amorphous to crystalline glass ceramic, and optimizes the half width of the maximum peak (0.10° or more) to achieve high lithium ion conductivity while maintaining environmental stability.
2Ease of manufacture
If conventional oxide-based solid electrolyte composition is used, then ease of manufacture is improved, but lithium ion conductivity deteriorates
Solution Approach 1:
The invention optimizes composition parameters (Li, M, P, O ratios) and processing parameters (heating temperature 1200-1650°C, cooling rate, crystallization temperature) to achieve high lithium ion conductivity. The specific requirement of half width ≥0.10° provides a clear manufacturing target that balances performance with manufacturability.
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 glass ceramic achieves a high lithium ion conductivity of 0.40 mS/cm, suitable for use as a solid electrolyte in lithium ion batteries, enhancing battery performance.
Implementation Method 1
heating the mixed powder to a temperature of 1200°C to 1650°C to obtain a melt
Implementation Method 2
cooling the melt to form a glass cullet containing a seed crystal
Implementation Method 3
heating the glass frit to a temperature equal to or higher than a crystallization temperature to form a glass ceramic
Data Source
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AI summary
A crystallized glass comprising: lithium (Li), element M, phosphorus (P), and oxygen (O); and at least one selected from boron (B) and silicon (Si), wherein the element M includes at least one selected from the group consisting of zirconium (Zr), hafnium (Hf), tin (Sn), samarium (Sm), niobium (Nb), tantalum (Ta), tungsten (W), and molybdenum (Mo), the maximum peak, in an X-ray diffraction pattern of the crystallized glass, appearing in a range of 2θ=20° to 30° is derived from a monoclinic crystal structure, and the half width of the maximum peak is 0.10° or more.