Halide Solid Electrolyte Structure Without Phase Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solid electrolyte materials for batteries face challenges in achieving high lithium ion conductivity and stability across a wide temperature range without phase transitions, and they often generate hydrogen sulfide, compromising safety.
Innovation Solution
A solid electrolyte material represented by the compositional formula Li6-3zYzX6, where 0<z<2 and X represents Cl or Br, is developed, featuring a crystal structure with irregular cation arrangements and nonuniform lattice constants, which enhances lithium ion conductivity and maintains stability without phase transitions within the battery's operation temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used, then lithium ion conductivity can be achieved, but hydrogen sulfide generation occurs compromising safety
Solution Approach 1:
The patent changes the chemical composition parameters by using halide compounds (Li3YX6 where X=Cl or Br) instead of sulfide compounds, fundamentally altering the material chemistry to eliminate hydrogen sulfide generation while maintaining lithium ion conductivity through appropriate compositional ratios and crystal structure design
Solution Approach 2:
The patent converts the harmful sulfide-based electrolyte into a beneficial halide-based electrolyte that not only eliminates hydrogen sulfide safety issues but also provides stable performance across wide temperature ranges, turning a safety-harmful material class into a safe and effective alternative
2Reliability
If conventional solid electrolyte materials are used, then battery operation is possible, but phase transitions occur outside the stable temperature range
Solution Approach 1:
The patent changes the compositional parameters by using specific halide compounds with controlled stoichiometry (Li3YX6) that inherently provide thermal stability, and the irregular cation arrangement in the crystal structure further enhances resistance to phase transitions across wide temperature ranges
Solution Approach 2:
The patent creates a composite crystal structure with irregular arrangement of cations (Li, Y) and halide ions (Cl or Br), forming a complex ordered-disordered structure that provides both high lithium ion conductivity and exceptional thermal stability, preventing phase transitions up to 80°C and beyond
3Ease of manufacture
If regular cation arrangement is used in crystal structure, then manufacturing is simpler, but lithium ion conductivity is reduced
Solution Approach 1:
The patent introduces asymmetry and irregularity in the cation arrangement within the crystal structure, creating a disordered configuration that unexpectedly enhances lithium ion conductivity pathways while the overall crystal symmetry is maintained through the halide sublattice, achieving both manufacturability and high performance
Solution Approach 2:
The patent implements local irregularity in cation positions (Li and Y atoms) while maintaining global crystal structure order through the halide framework, creating localized conductive pathways that enhance lithium ion mobility without requiring complete structural disorder, thus balancing manufacturability and performance
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 achieves high lithium ion conductivity and stable charge and discharge characteristics, preventing phase transitions and hydrogen sulfide generation, thus ensuring safe and efficient battery operation.
Implementation Method 1
a solid electrolyte material having a high lithium ion conductivity can be achieved
Data Source
AI summary
A solid electrolyte material according to an aspect of the present disclosure is represented by the following Compositional Formula (1):Li6-3zYzX6 where 0<z<2 is satisfied; and X represents Cl or Br.