Solid Electrolyte Chain Structure for Air-Stable Lithium-Ion Conduction
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Solution Overview
Problem
Current solid electrolyte materials for batteries, such as sulfide and halide-based ones, face limitations in lithium ion conductivity and stability, particularly in air exposure, which affects battery performance and safety.
Innovation Solution
A solid electrolyte material with a one-dimensional chain structure composed of linearly connected polyhedrons sharing corners, featuring a cation and anion framework that enhances ionic conductivity and stability, while avoiding sulfur to prevent hydrogen sulfide generation, is developed. This material is produced through mechanochemical milling of halides and oxides, allowing for high lithium ion conduction and improved battery charge-discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used, then ionic conductivity is improved, but stability in air deteriorates and hydrogen sulfide generation occurs
Solution Approach 1:
The patent changes the chemical composition parameters by using halide-based solid electrolyte (Li2MgX4 where X is F, Cl, Br, or I) instead of sulfide-based electrolyte, fundamentally altering the material's chemical properties to achieve both high ionic conductivity and air stability without hydrogen sulfide generation
Solution Approach 2:
The patent employs composite material design with specific cation-anion combinations (Li2MgX4 structure) that combine the advantages of different elements to achieve high ionic conductivity while maintaining chemical stability in air, avoiding the harmful effects of pure sulfide electrolytes
2Ease of manufacture
If conventional solid electrolyte structures are used, then manufacturing is simplified, but lithium ion conductivity is insufficient
Solution Approach 1:
The patent segments the crystal structure into a framework of isolated polyhedrons (MgX6 octahedrons) connected through corner-sharing, creating discrete structural units that facilitate lithium ion transport while maintaining structural simplicity for manufacturing
Solution Approach 2:
The patent creates local regions of high ionic conductivity by forming one-dimensional chains of polyhedrons with specific coordination environments, where the local structural arrangement optimizes lithium ion pathways without complicating the overall material synthesis
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 solid electrolyte material exhibits high ionic conductivity and stability, enhancing battery performance with improved charge-discharge characteristics and safety by reducing the filling ratio and electrostatic interaction, thus facilitating efficient lithium ion transfer.
Implementation Method 1
a solid electrolyte material having high lithium ion conductivity
Implementation Method 2
This material is produced through mechanochemical milling of halides and oxides
Data Source
AI summary
A solid electrolyte material comprises a crystal structure including a structure framework and an ion-conductive species. The structure framework has a one-dimensional chain. In the one-dimensional chain, a plurality of polyhedrons are linearly connected to each other while sharing a corner, and each of the plurality of polyhedrons contains at least one type of cation and at least one type of anion.