Columnar Solid Electrolyte for Heat-Stable Lithium-Ion Conductivity
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Solution Overview
Problem
Existing solid electrolyte materials experience a decrease in ion conductivity due to heat, which affects the performance and stability of batteries.
Innovation Solution
A solid electrolyte material comprising Li, M, O, and X, where M is Nb or Ta, and X is F, Cl, Br, or I, with columnar crystals having an average aspect ratio of 5 or more and an average length of 20 μm or less, which suppresses evaporation of constituent elements and maintains ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then ion conductivity is maintained at room temperature, but ion conductivity decreases significantly due to heat
Solution Approach 1:
The patent changes the crystal structure parameters by forming columnar crystals with specific aspect ratios (L/W ≥ 5) and controlled lengths (≤20 μm). This structural parameter change enables the material to maintain ion conductivity under heat by creating stable diffusion pathways that are less sensitive to thermal effects.
Solution Approach 2:
The patent uses a composite material system with specific element combinations (Li, M where M is Nb or Ta, O, and X where X is F, Cl, Br, or I). This composite approach creates a material structure that combines the benefits of different elements to achieve both room temperature conductivity and heat resistance.
2Temperature
If columnar crystal structure is formed with high aspect ratio, then heat resistance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for crystal formation: aspect ratio L/W of 5 or more, but length W of 20 μm or less. These parameter definitions provide clear manufacturing targets that balance the need for heat resistance with achievable manufacturing precision.
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 effectively suppresses the decrease in ion conductivity due to heat, maintaining high lithium ion conductivity and excellent heat-resisting properties, thereby ensuring stable battery operation across varying temperatures.
Implementation Method 1
the solid electrolyte material includes columnar crystals, and an average of aspect ratios (L/W) of the length (L) and the width (W) of the columnar crystals is 5 or more, and an average length is 20 μm or less. The solid electrolyte material can easily form a path for diffusion of lithium ions and, at the same time, suppresses evaporation of the constituent elements by heat.
Implementation Method 2
The solid electrolyte material can easily form a path for diffusion of lithium ions
Implementation Method 3
a solid electrolyte material that can suppress a decrease in ion conductivity due to heat
Data Source
AI summary
A solid electrolyte material of the present disclosure comprises Li, M, O, and X, wherein M is at least one selected from the group consisting of Nb and Ta, and X is at least one selected from the group consisting of F, Cl, Br, and I. The solid electrolyte material contains columnar crystals. The average of aspect ratios (L/W) of the length (L) and the width (W) of the columnar crystals is 5 or more, and the average length is 20 μm or less. A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material according to the present disclosure.