Amorphous Li-Al-F Solid Electrolyte for Conductive Bonded Interfaces
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Solution Overview
Problem
Existing solid electrolyte materials, such as Li3AlF6, face challenges in achieving high ionic conductivity and reliable bonding interfaces in compacted powder structures, which are essential for advanced battery applications.
Innovation Solution
A novel solid electrolyte material comprising an amorphous substance containing Li, Al, and F, which is synthesized through a method involving heat-treatment of a mixture of raw materials followed by a mechanochemical treatment to disturb the crystal structure, resulting in improved ionic conductivity and particle deformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If crystalline Li3AlF6 is used as solid electrolyte, then structural stability is improved, but ionic conductivity and particle deformability deteriorate
Solution Approach 1:
The patent creates a composite solid electrolyte material consisting of Li3AlF6 crystalline phase combined with an amorphous phase containing LiF and AlF3. This composite structure combines the structural stability of crystalline Li3AlF6 with the high ionic conductivity and deformability of the amorphous phase, resolving the contradiction between stability and ionic conductivity
Solution Approach 2:
The patent changes the physical state parameter of portions of the electrolyte material from crystalline to amorphous. By controlling the heat treatment and cooling processes, amorphous regions are formed within the crystalline Li3AlF6 matrix, transforming the material properties to achieve both stability and high ionic conductivity
2Stability of the object's composition
If crystalline Li3AlF6 is used as solid electrolyte, then structural stability is improved, but bonding interface formation deteriorates
Solution Approach 1:
The amorphous phase in the composite structure provides enhanced particle deformability and bonding capability. When particles are compacted, the amorphous regions can deform and form strong bonding interfaces, while the crystalline Li3AlF6 provides structural stability, thus resolving the contradiction between stability and bonding interface formation
Solution Approach 2:
The patent creates local amorphous regions within or between crystalline Li3AlF6 particles. These localized amorphous zones provide the necessary deformability for bonding interface formation, while the surrounding crystalline structure maintains overall structural stability
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 proposed solid electrolyte material exhibits high ionic conductivity, excellent particle deformability, and enhanced bonding interface formation, leading to improved charge/discharge characteristics in battery applications.
Implementation Method 1
The solid electrolyte material according to the first aspect has a practical ionic conductivity thanks to the inclusion of an amorphous substance containing Li, Al, and F
Implementation Method 2
which is synthesized through a method involving heat-treatment of a mixture of raw materials
Implementation Method 3
followed by a mechanochemical treatment to disturb the crystal structure
Data Source
AI summary
The solid electrolyte material of the present disclosure is a solid electrolyte material containing Li, Al, and F, comprising an amorphous substance containing Li, Al, and F. The solid electrolyte material of the present disclosure may further comprise a crystalline phase containing Li, Al, and F. The solid electrolyte material production method of the present disclosure comprises: (A) synthesizing a compound comprising a crystalline phase containing Li, Al, and F; and (B) performing a treatment to disturb the crystal of the compound. The compound may be mechanochemically treated in the step (B).