Oxyhalide Solid Electrolyte Composition for Stable Li-Ion Conduction
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Solution Overview
Problem
Existing solid electrolyte materials for batteries fail to achieve both high lithium-ionic conductivity and electrochemical stability, leading to decreased performance in charge-discharge characteristics and increased internal resistance.
Innovation Solution
An oxyhalide material comprising Li, M, and X, where M is at least two Group 5 elements and X is a halogen, exhibiting a reversible oxidation-reduction reaction with specific X-ray diffraction patterns and optimized molar ratios, enhancing lithium-ionic conductivity and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing solid electrolyte materials are used, then lithium-ionic conductivity can be achieved, but electrochemical stability deteriorates
Solution Approach 1:
The patent employs composite materials by combining multiple elements (Li, M where M is at least two of Nb, Ta, V; O; and X where X is F, Cl, Br, or I) to form an oxyhalide material that achieves both high lithium-ionic conductivity and electrochemical stability. The specific composition Li2-xM1-x/3VOX6-y/2 with controlled stoichiometry creates a composite structure that simultaneously provides the desired electrical and chemical properties.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the stoichiometric ratios of elements in the oxyhalide material, specifically the values of x and y in the formula Li2-xM1-x/3VOX6-y/2. By adjusting these parameters within specific ranges (0 < x ≤ 1, 0 < y ≤ 1), the material achieves optimal balance between lithium-ionic conductivity and electrochemical stability. The patent also controls the oxidation state of vanadium to be +4 or +5 to optimize performance.
2Productivity
If existing solid electrolyte materials are used, then battery operation is possible, but charge-discharge characteristics deteriorate
Solution Approach 1:
The patent optimizes charge-discharge characteristics by changing physical and chemical parameters of the oxyhalide material, including controlling particle size, surface area, and crystalline structure. The specific compositional parameters (x and y values) are adjusted to minimize internal resistance and maximize ion transport efficiency during charge-discharge cycles, achieving both high productivity and low resistance.
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 oxyhalide material demonstrates high lithium-ionic conductivity and electrochemical stability, improving charge-discharge characteristics and energy density while maintaining structural integrity under varying potentials and temperatures.
Implementation Method 1
a solid electrolyte material containing Li, M, O, and X... having practical lithium-ionic conductivity
Implementation Method 2
the oxyhalide material showing a reversible oxidation-reduction reaction
Implementation Method 3
in an X-ray diffraction pattern obtained by X-ray diffraction measurement on the oxyhalide material using Cu-Kα radiation
Data Source
AI summary
An oxyhalide material of the present disclosure contains Li, M, O, and X. M is at least two selected from Group 5 elements. X is at least one selected from the group consisting of F, Cl, Br, and I. The oxyhalide material of the present disclosure shows a reversible oxidation-reduction reaction. In an X-ray diffraction pattern obtained by X-ray diffraction measurement on the oxyhalide material using Cu-Kα radiation, at least one peak is present in a first range, and (A) or (B) below is satisfied: (A) No peak is present in a second range. (B) At least one peak is present in the second range, and a ratio of intensity Ip1 of a peak with the highest intensity present in the first range to intensity Ip2 of a peak with the highest intensity present in the second range Ip1/Ip2 is larger than 5.