LAGP Solid Electrolyte Uniform Crystallization via Y2O3 Nucleation
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Solution Overview
Problem
Current lithium-ion battery technologies face challenges in achieving high specific energy due to limitations in metal lithium protection, particularly with non-uniform crystallization in glass-ceramic solid electrolytes leading to decreased ionic conductivity and mechanical instability, which affects the performance of Lithium/Air, Lithium/Sulphur, and metallic lithium/polymer batteries.
Innovation Solution
The use of Y2O3 as a crystal nucleation agent in the glass-ceramic process for LAGP solid electrolytes, allowing for uniform crystallization and enhancing ionic conductivity up to five times, while maintaining chemical and electrochemical stability and gas tightness, thereby protecting metal lithium effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass-ceramic solid electrolytes are used to protect metal lithium, then chemical and electrochemical stability is improved, but non-uniform crystallization occurs leading to decreased ionic conductivity
Solution Approach 1:
A nucleating agent is introduced as an intermediary substance to mediate the crystallization process of glass-ceramic solid electrolytes. The nucleating agent promotes uniform nucleation and crystal growth, ensuring homogeneous crystallization structure while maintaining the chemical stability of the glass-ceramic matrix. This resolves the contradiction by enabling controlled, uniform crystallization without compromising the inherent stability of the glass-ceramic material.
Solution Approach 2:
The crystallization parameters (temperature, time, cooling rate) are optimized and adjusted to achieve uniform crystallization. By precisely controlling these parameters, the patent ensures homogeneous crystal distribution and size, preventing non-uniform crystallization while preserving the chemical stability required for metal lithium protection.
2Reliability
If glass-ceramic solid electrolytes are used to protect metal lithium, then chemical and electrochemical stability is improved, but mechanical instability occurs leading to decreased ionic conductivity
Solution Approach 1:
The patent employs composite glass-ceramic materials that combine the chemical stability of glass matrices with the mechanical strength of crystalline phases. The controlled crystallization produces a composite structure where crystals are uniformly distributed within the glass matrix, providing both mechanical integrity and ionic conductivity pathways, thus resolving the contradiction between mechanical stability and chemical stability.
3Ease of manufacture
If conventional glass-ceramic processing is used, then manufacturing simplicity is maintained, but ionic conductivity is insufficient for high performance battery applications
Solution Approach 1:
Nucleating agents are added as intermediaries during the conventional glass-ceramic processing to enhance ionic conductivity. These agents promote the formation of crystal structures with favorable ionic conductivity properties without requiring complex processing changes, thus improving reliability while maintaining ease of manufacture.
Solution Approach 2:
The patent optimizes processing parameters such as crystallization temperature and holding time to maximize ionic conductivity within the framework of conventional processing. By adjusting these parameters, high ionic conductivity is achieved without introducing complex manufacturing steps, resolving the contradiction between ease of manufacture and ionic conductivity performance.
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 modified glass-ceramic LAGP solid electrolytes demonstrate significantly higher ionic conductivity and mechanical stability, enabling improved performance in battery applications, particularly in Hybrid Electrical Vehicles, Plug-in Hybrid Electrical Vehicles, and Electric Vehicles.
Implementation Method 1
The use of Y2O3 as a crystal nucleation agent in the glass-ceramic process for LAGP solid electrolytes, allowing for uniform crystallization
Implementation Method 2
uniform crystallization and enhancing ionic conductivity up to five times
Data Source
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AI summary
The present invention is related to a solid electrolyte, particularly lithium-conductive solid electrolyte, obtained from a glass-ceramics process and a method of producing same. Said solid electrolyte is LAGP (Li1+xAlxGE2-x(PO4)3) (10) modified by a crystallization nucleation agent.