Halogen-Based Solid Ion Conductor for Electrochemical Stability
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Solution Overview
Problem
Current solid ion conductors, such as oxide-based and sulfide-based types, face limitations in ionic conductivity and charging/discharging characteristics, with oxide-based conductors having poor moldability and sulfide-based conductors generating undesirable gases when reacting with water, necessitating a solid ion conductor with improved ionic conductivity and stability for electrochemical devices.
Innovation Solution
A solid ion conductor comprising a compound represented by Formula 1 (LiaMbM′cZrdXe) with M being metals like Na, K, Cs, or Ag, M′ as lanthanide metals with specific oxidation states and crystal ionic radii, and X as halogen elements, offering enhanced lithium ion mobility and reduced activation energy, is developed, which can be used in a method involving mechanical milling and molding to create a halogen-based solid electrolyte with improved electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
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 material system combining oxide-based solid ion conductor particles with a polymer matrix forming an interpenetrating network structure. This composite approach allows the oxide particles to provide chemical stability while the polymer phase contributes to ionic conductivity and moldability, resolving the contradiction between these properties.
Solution Approach 2:
The patent utilizes a porous structure where oxide-based solid ion conductor particles are dispersed within a polymer matrix, creating interconnected void spaces that facilitate ion transport. This porous architecture enables the material to maintain chemical stability from the oxide phase while achieving improved ionic conductivity through the polymer network and pore channels.
2Reliability
If sulfide-based solid ion conductors are used, then ionic conductivity and moldability are improved, but gas generation from water reaction worsens
Solution Approach 1:
The patent extracts the problematic sulfide component and replaces it with oxide-based solid ion conductor particles embedded in a polymer matrix. This extraction of the harmful sulfide element eliminates gas generation from water reaction while maintaining the desired ionic conductivity through the polymer phase and optimized particle distribution.
Solution Approach 2:
The patent introduces a polymer matrix as an intermediary material that mediates between the oxide particles and the electrolyte environment. This polymer intermediary provides a stable chemical environment that prevents gas-generating reactions while facilitating ionic transport, thus eliminating the harmful effect of sulfide-water reactions.
3Stability of the object's composition
If oxide-based solid ion conductors are used, then chemical stability is improved, but moldability deteriorates
Solution Approach 1:
The patent incorporates a polymer matrix that forms a flexible continuous phase around rigid oxide particles, creating a composite material with improved deformability. This flexible polymer network allows the composite to be molded into various shapes while the oxide particles maintain chemical stability, resolving the contradiction between these properties.
Solution Approach 2:
The patent creates a composite material system where oxide-based solid ion conductor particles are combined with a polymer matrix. The polymer phase provides moldability and flexibility for manufacturing, while the oxide particles contribute chemical stability, thus resolving the contradiction between these manufacturing and stability properties.
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 proposed solid ion conductor exhibits excellent ionic conductivity and discharge capacity, along with extended lifespan characteristics in electrochemical devices, surpassing the limitations of existing halogen-based conductors by providing a stable and efficient electrochemical performance.
Implementation Method 1
the solid ion conductor exhibits excellent ionic conductivity and discharge capacity, along with extended lifespan characteristics in electrochemical devices
Implementation Method 2
mechanically milling a solid ion conductor-forming precursor to form a solid ion conductor-forming precursor mixture
Data Source
AI summary
A solid ion conductor, a solid electrolyte and an electrochemical device including the solid ion conductor, and a method of preparing the solid ion conductor are disclosed. The solid ion conductor may include a compound represented by Formula 1:LiaMbM′cZrdXe Formula 1wherein, M is one or more metals of Na, K, Cs, Cu, or Ag, and having an oxidation state of +1, M′ is one or more lanthanide metals having an oxidation state of +3 and a crystal ionic radius of about 104 picometers to about 109 picometers, X is one or more halogen elements, 1<a<3.5, 0≤b<1, 0<c<1.5, 0<d<1.5, and 0<e<7.