Halogenated Glass-Ceramic Solid Electrolyte for High Ionic Conductivity
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Solution Overview
Problem
Existing lithium-ion batteries face challenges with low filling rates and ionic conductivity in solid electrolytes, particularly in Li3PS4 glass, which limits their performance and safety.
Innovation Solution
A glass-ceramic solid electrolyte composed of lithium, phosphorus, sulfur, and halogen elements, with specific molar ratios and crystallite sizes, optimized for higher filling rates and ionic conductivity, characterized by distinct X-ray diffraction peaks and crystallite sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Li3PS4 glass is used as solid electrolyte to increase filling rate, then filling rate is improved, but ionic conductivity deteriorates (less than 1 mS/cm)
Solution Approach 1:
The invention changes the chemical composition parameters by introducing halogen elements (Cl, Br, I) into the Li3PS4 glass system, creating Li3PS4-X glass-ceramics. This compositional modification enables simultaneous achievement of high filling rate and high ionic conductivity (1 mS/cm or more) that cannot be obtained with pure Li3PS4 glass
Solution Approach 2:
The invention creates a composite glass-ceramic material combining crystalline phases (with specific diffraction peaks at 2θ=20±1° and 23.6±1°) and amorphous glass matrix. This composite structure, achieved through controlled crystallization, provides both high filling rate and high ionic conductivity, resolving the contradiction between these two properties
2Ease of manufacture
If mechanical softening is applied to increase filling rate, then ease of manufacture is improved, but structural integrity may deteriorate
Solution Approach 1:
The invention optimizes the crystallite size parameter to 5-20 nm, creating a nanocrystalline structure that provides appropriate mechanical softness for high filling rate while maintaining sufficient structural integrity through the crystalline phase network in the glass-ceramic material
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 solid electrolyte achieves a higher filling rate and ionic conductivity, enhancing the performance and safety of lithium-ion batteries.
Implementation Method 1
a glass-ceramic solid electrolyte having a high filling rate and a high ionic conductivity
Implementation Method 2
a peak A at position of 2θ=20±1° in powder X-ray diffraction using CuKα ray
Implementation Method 3
powder X-ray diffraction using CuKα ray, and has no peak B at a position of 2θ=23.6±1°
Data Source
AI summary
A glass-ceramic solid electrolyte comprising lithium, phosphorus, sulfur and halogen as constituent elements, wherein a molar ratio (Li/P) of the lithium (Li) to the phosphorus (P) is 2.0 to 5.3, a molar ratio (S/P) of the sulfur(S) to the phosphorus (P) is 2.0 to 4.5, and a molar ratio (X/P) of the halogen (X) to the phosphorus (P) is 0.1 to 2.3, and the glass-ceramic solid electrolyte has a peak A at position of 2θ=20±1° in powder X-ray diffraction using CuKα ray, and has no peak B at a position of 2θ=23.6±1°, or has the peak B in the powder X-ray diffraction, when the glass-ceramic solid electrolyte has the peak B, a peak intensity ratio (IB/IA) of a peak intensity (IB) of the peak B to a peak intensity (IA) of the peak A is less than 0.050, and the glass-ceramic solid electrolyte has a crystallite size of 5 to 20 nm.