Solid Crystalline Electrolyte Composition for Stable Li-Ion Conduction
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Solution Overview
Problem
Current solid electrolytes in lithium ion batteries face challenges such as low ionic conductivity, high elastic constants hindering processing, poor stability, and soft mechanical properties, which affect their performance and safety.
Innovation Solution
A new solid crystalline material with the formula LiaMY4XZ, where M is selected from Si, Al, Sb, Sn, B, Ga, and Ge, or their mixtures, and X and Z are independently selected from O, S, F, Cl, Br, and I, is developed. This material exhibits high ionic conductivity, improved stability, and mechanical properties that lie between soft sulphides and brittle oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If doping various elements into the crystal structure is performed to achieve desirable conductivity, then ionic conductivity is improved, but physical properties deteriorate hindering processing
Solution Approach 1:
The patent optimizes the base composition parameters (a=6-7, specific M and Y ratios) to achieve good ionic conductivity without requiring heavy doping, and the resulting material has improved physical properties including higher elastic constants that facilitate processing
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 crystalline material achieves high ionic conductivity suitable for use as a solid electrolyte in thin-film solid-state batteries, offers better stability than sulphide alternatives, and can be synthesized at lower temperatures using earth-abundant elements, reducing energy costs and environmental impact.
Implementation Method 1
These inorganic solid ion conductors conduct electricity by the passage of ions through an otherwise rigid crystal structure
Data Source
AI summary
A solid crystalline material of formula (I): LiaMY4XZ: wherein: a is from 5 to 8: M is selected from Si, Al, Sb, Sn, B, Ga and Ge, a mixture thereof, or a mixture thereof comprising P1-xM′ wherein M′ is selected from Si, Al, Sb, Sn, B, Ga and Ge or a mixture thereof and wherein 0<x≤1; wherein when M is Si at least one of X and Z is O; Y is O1-bSb, wherein b is from 0 to 0.5; and X and Z are each independently selected from O, S, F, Cl, Br, I or a mixture thereof. The solid crystalline material suitably provides a solid ionic conductor for use in a solid-state battery. A solid crystalline material comprising a solid solution, a solid-state battery comprising the solid crystalline material and a method of preparing the solid crystalline are also disclosed.