Lithium-Ion Conductor Glass Composition for Low-Temperature Crystallization
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Solution Overview
Problem
Lithium ion secondary batteries with liquid electrolytes face safety risks due to potential leakage and flammability, while solid electrolytes with high crystallization temperatures and reactivity issues hinder optimal ionic conductivity.
Innovation Solution
A lithium ion conductor precursor glass composition comprising specific ratios of Li2O, P2O5, Al2O3, GeO2, and optionally Bi2O3/TeO2, which crystallizes at low temperatures, forming Li1+xAlxGe2−x(PO4)3 crystals, ensuring high lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte with high crystallization temperature is used, then ionic conductivity can be maintained at higher temperatures, but the electrolyte reacts with electrode materials and causes deterioration of battery performance
Solution Approach 1:
The patent changes the compositional parameters of the solid electrolyte by incorporating Bi2O3 or TeO2 into the Li2O-P2O5-GeO2-Al2O3 system, which modifies the crystallization temperature and reactivity characteristics of the material while maintaining ionic conductivity
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining multiple oxides (Li2O, P2O5, GeO2, Al2O3, and Bi2O3 or TeO2) in specific ratios, resulting in a material that exhibits both low reactivity with electrodes and adequate ionic conductivity
2Object-affected harmful factors
If the crystallization temperature is reduced, then reactivity with electrode materials decreases, but ionic conductivity required for battery performance cannot be obtained
Solution Approach 1:
The patent optimizes the compositional parameters within specific ranges (Li2O: 10-35 mol%, P2O5: 20-50 mol%, GeO2: 20-50 mol%, Al2O3: >0-15 mol%, Bi2O3/TeO2: >0-15 mol%) to achieve a balance between low crystallization temperature and high ionic conductivity
Solution Approach 2:
The patent introduces localized modifications to the crystal structure through the addition of Bi2O3 or TeO2, which creates favorable local environments for lithium ion conduction while maintaining overall structural stability and low reactivity
3Quantity of substance
If a liquid electrolyte is used, then high energy density is achieved, but safety risks increase due to leakage and flammability
Solution Approach 1:
The patent extracts the harmful organic solvent component from the electrolyte system and replaces it with an inorganic solid electrolyte material, eliminating flammability and leakage risks while retaining the essential ionic conduction function
Solution Approach 2:
The patent substitutes the liquid-phase electrolyte mechanism with a solid-phase electrolyte mechanism, replacing the fluid-based ion transport system with a solid crystal structure that enables lithium ion conduction through defined pathways
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 solution provides a solid electrolyte with improved safety and conductivity, enabling stable battery performance by reducing reactivity with electrode materials and maintaining high lithium ion conductivity.
Implementation Method 1
the lithium ion conductor is obtained by subjecting the lithium ion conductor precursor glass to a heat treatment, so that the lithium ion conductor precursor glass crystalizes
Data Source
AI summary
As a solid electrolyte used in a lithium ion secondary battery, it has not been possible to obtain a lithium ion conductor precursor glass and a lithium ion conductor in which crystallization progresses at low temperatures and which exhibit high ion conductivity. The present invention can obtain a lithium ion conductor precursor glass and a lithium ion conductor in which crystallization progresses even at low temperatures and which exhibit high ion conductivity by containing 10-35% of a Li2O component, 20-50% of a P2O5 component, greater than 0% to 15% of an Al2O3 component, 20-50% of a GeO2 component and greater than 0% to 15% of a Bi2O3 component and/or a TeO2 component.