Halide Solid Ion Conductor Composition for Stable Lithium Transport
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Solution Overview
Problem
Current solid ion conductors, such as oxide-based and sulfide-based types, face limitations in ionic conductivity, electrochemical stability, and charging/discharging characteristics, with sulfide-based conductors experiencing gas generation issues and oxide-based conductors having poor moldability and low conductivity.
Innovation Solution
A halide-based solid ion conductor with a distorted rock-salt type structure, represented by compounds like LiaMbIncXd, where M is a metal with specific oxidation states and X is a halogen, offering increased ionic conductivity and electrochemical stability, and a method of preparing this conductor through mechanical milling and heat-treating a precursor mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide-based solid ion conductors are used, then chemical stability is improved, but ionic conductivity and moldability deteriorate
Solution Approach 1:
The patent employs a composite solid ion conductor comprising a sulfide-based solid ion conductor and an oxide-based solid ion conductor. The sulfide component provides high ionic conductivity and good moldability, while the oxide component contributes chemical stability. This composite structure resolves the contradiction by combining materials with complementary properties to achieve a balance among chemical stability, ionic conductivity, and moldability.
2Ease of manufacture
If sulfide-based solid ion conductors are used, then ionic conductivity and moldability are improved, but gas generation occurs due to reaction with water
Solution Approach 1:
The patent addresses the harmful gas generation from sulfide-based solid ion conductors by combining them with oxide-based solid ion conductors in a composite structure. The oxide component acts as a protective barrier that prevents water from reacting with the sulfide component, thereby eliminating gas generation while preserving the high ionic conductivity and moldability benefits of the sulfide-based material.
3Reliability
If conventional solid ion conductors are used, then basic functionality is achieved, but charging and discharging characteristics deteriorate
Solution Approach 1:
The patent utilizes a composite solid ion conductor combining sulfide-based and oxide-based solid ion conductors to resolve the contradiction between electrochemical stability and charging/discharging characteristics. The sulfide component provides high ionic conductivity that enables fast charging and discharging, while the oxide component ensures electrochemical stability. This composite approach achieves both improved productivity and maintained reliability.
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 halide-based solid ion conductor exhibits improved ionic conductivity and electrochemical stability in a wide voltage window, enhancing the charging and discharging performance of electrochemical devices like all-solid secondary batteries.
Implementation Method 1
a solid ion conductor having increased ionic conductivity
Implementation Method 2
heat-treating a precursor mixture
Data Source
AI summary
A solid ion conductor, a solid electrolyte and an electrochemical device each including the same, and a method of preparing the solid ion conductor are disclosed. The solid ion conductor may include a compound represented by Formula 1:LiaMbIncXd Formula 1In Formula 1, M is at least one of a metal having an oxidation state of +1, or a metal having an oxidation state of +3, X is at least one halogen, 2.5<a<3.5, 0<b<0.5, 0.5<c<1.5, and 5<d<7.