Amorphous Halide Solid Electrolyte for Low-Resistance Batteries
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Solution Overview
Problem
Existing solid electrolyte materials for batteries face challenges in reducing internal and interfacial resistance, which affects their performance and efficiency.
Innovation Solution
A solid electrolyte material composed of Li, M, and X, where M is Nb or Ta, and X is F, Cl, or Br, is developed. This material is amorphous, with a specific X-ray diffraction pattern and a high ionic conductivity, and is synthesized and amorphized through a dry milling process to enhance lithium-ion conductivity and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials are used, then battery structure is maintained, but internal resistance and interfacial resistance remain high
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific halogen elements (F, Cl, Br, I) as X in the Li-M-O-X compound structure, and controls the amorphous phase parameters through specific heat treatment processes. These parameter changes achieve low internal resistance and high ionic conductivity while maintaining manufacturing feasibility through established ceramic processing methods
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining Li, M (Nb or Ta), O, and halogen elements (X) in specific ratios, forming an amorphous composite structure. This composite approach achieves superior electrical properties and low resistance compared to conventional single-phase materials, while the use of common ceramic processing techniques keeps manufacturing complexity manageable
2Reliability
If sulfur-containing solid electrolyte materials are used, then ionic conductivity is achieved, but safety and stability are compromised
Solution Approach 1:
The patent extracts and eliminates sulfur from the solid electrolyte composition entirely, replacing it with halogen elements (F, Cl, Br, I). This extraction removes the safety and stability issues associated with sulfur while maintaining high ionic conductivity through the amorphous Li-M-O-X structure, achieving both safety and energy efficiency
3Reliability
If crystalline solid electrolyte structure is used, then material stability is maintained, but ionic conductivity is limited
Solution Approach 1:
The patent utilizes phase transition by forming an amorphous phase instead of a crystalline structure. The amorphous phase provides higher ionic conductivity due to its disordered structure that facilitates ion transport, while the specific heat treatment process ensures compositional stability. This phase transition approach resolves the contradiction between conductivity and 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 material significantly reduces internal and interfacial resistance in batteries, improving their charge and discharge characteristics and safety by eliminating sulfur, which enhances lithium-ion conductivity and stability.
Implementation Method 1
the solid electrolyte material has high lithium-ion conductivity and is suitable for reducing the internal resistance and interfacial resistance of batteries
Implementation Method 2
In an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu—Kα radiation, a peak having a maximum intensity is present as a halo pattern
Data Source
AI summary
A solid electrolyte material according to the present disclosure includes Li, M, O, and X, wherein the M is at least one selected from the group consisting of Nb and Ta, and the X is at least one selected from the group consisting of F, Cl, Br, and I. The solid electrolyte material according to the present disclosure is amorphous, and in an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu—Kα radiation, a peak having a maximum intensity is present as a halo pattern in a diffraction angle 2θ range from 10° to 20°, and the peak has a full width at half maximum of 2° or more.