Fluorinated Antiperovskite Solid Electrolyte for Li-Ion Conductivity
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Solution Overview
Problem
Current lithium ion conductive materials for all-solid-state batteries do not offer sufficient lithium ionic conductivity, which is essential for enhancing battery performance and safety.
Innovation Solution
A lithium ion conductive material with a composition formula of Lia(OH)bFcBr, where 1.8≤a≤2.3, b=a−c−1, and 0.01≤c≤0.11, incorporating an antiperovskite-type crystal phase, is developed, along with a manufacturing method involving heating LiBr, LiOH, and LiF under specific conditions to create a solid electrolyte for all-solid-state secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium ion conductive materials are used, then battery safety is improved by using solid electrolytes instead of liquid electrolytes, but lithium ionic conductivity is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by introducing fluorine doping into the antiperovskite structure (formula: Li2(OH)1-xFxCl). By controlling the fluorine content parameter (x), the material achieves optimal balance between safety and ionic conductivity. The fluorine substitution modifies the crystal lattice properties to enhance lithium ion transport while maintaining the solid-state safety advantages.
Solution Approach 2:
The patent creates a composite material system combining antiperovskite-type lithium hydroxide halide with fluorine doping. This composite approach integrates the structural stability of antiperovskite with the ionic conductivity enhancement from fluorine incorporation, achieving both safety and high conductivity performance that neither component alone could provide.
2Adaptability or versatility
If various lithium ion conductive materials are studied to broaden options, then material versatility is improved, but the number of materials required to achieve desired conductivity increases
Solution Approach 1:
The patent develops a universal solid electrolyte material platform based on fluorine-doped antiperovskite lithium hydroxide halide that can serve multiple battery applications. By adjusting the fluorine content and cation composition within defined ranges, a single material system can achieve different performance levels, eliminating the need to develop and manage multiple distinct material formulations.
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 new material achieves high lithium ionic conductivity, improving battery performance and safety by ensuring reliable ion insertion and removal at desired potentials, as demonstrated in experimental examples with varying molar ratios of LiBr, LiOH, and LiF.
Implementation Method 1
an all-solid-state lithium battery using a solid lithium ion conductive material
Implementation Method 2
LiBr, LiOH, and LiF are heated at a temperature not lower than 250° C. and not higher than 600° C. for 0.1 hours or more
Data Source
AI summary
A lithium ion conductive material has a composition formula of Lia(OH)bFcBr, where 1.8≤a≤2.3, b=a−c−1, 0.01≤c≤0.11, and includes an antiperovskite-type crystal phase. Preferably, the lithium ion conductive material further includes a layered antiperovskite-type crystal phase. More preferably, 0≤B/(A+B)≤0.2 is satisfied, where A is the peak intensity in the vicinity of 2θ=31.2° in the X-ray diffractometry using Cu-Kα ray and B is the peak intensity in the vicinity of 2θ=30.2°.