Core-Shell Solid Electrolyte to Limit H2S While Preserving Conductivity
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Solution Overview
Problem
Sulfide-based solid electrolytes for all-solid-state batteries face challenges such as low lithium ion conductivity, instability in the crystalline phase, poor atmospheric stability, and difficulty in mass production due to hydrogen sulfide generation when exposed to moisture, hindering commercialization.
Innovation Solution
A solid electrolyte with a core-shell structure is developed, where the cores are made of a first electrolyte (e.g., Li6PS5I) and the shells of a second electrolyte (e.g., Li6PS5Br) with specific particle size ratios and ionic radii, and optionally a skin layer, enhancing lithium ion conductivity and atmospheric stability, manufactured through a method involving precursor solutions, heat treatment, and shear stress application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolyte is used to achieve high energy density, then lithium ion conductivity can be improved, but atmospheric stability deteriorates due to hydrogen sulfide generation when exposed to moisture
Solution Approach 1:
The patent employs a core-shell composite structure where the core contains sulfide-based solid electrolyte particles (high lithium ion conductivity) and the shell contains oxide-based solid electrolyte material (atmospheric stability). This composite structure allows the internal sulfide core to provide high energy density while the external oxide shell protects against moisture exposure, preventing hydrogen sulfide generation and degradation.
2Use of energy by moving object
If sulfide-based solid electrolyte is used to achieve high energy density, then battery performance can be improved, but mass production becomes difficult due to vulnerability to atmospheric exposure
Solution Approach 1:
The patent applies the preliminary action principle by pre-coating the sulfide-based solid electrolyte particles with oxide-based solid electrolyte material before battery assembly. This preliminary protective coating is applied during the electrolyte preparation stage, creating atmospheric stability upfront so that subsequent handling and mass production processes can proceed without special atmospheric control requirements.
3Use of energy by moving object
If sulfide-based solid electrolyte is exposed to moisture to generate ionic conductivity, then lithium ion transport can be enhanced, but hydrogen sulfide is generated causing toxicity and degradation
Solution Approach 1:
The patent uses oxide-based solid electrolyte material as an intermediary layer between the sulfide-based solid electrolyte and the external environment. This intermediary shell allows lithium ion transport while blocking moisture exposure, thereby enabling ionic conductivity without generating harmful hydrogen sulfide gas.
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 core-shell structure significantly improves lithium ion conductivity and atmospheric stability, reducing hydrogen sulfide generation, thus overcoming the limitations of conventional sulfide-based solid electrolytes and facilitating mass production and commercialization of all-solid-state batteries.
Implementation Method 1
cores including a first electrolyte represented by Chemical Formula 1... Li6PS5I... high lithium ion conductivity
Implementation Method 2
shells including a second electrolyte represented by Chemical Formula 2... Li6PS5Cl... coated on surfaces of the cores... atmospheric stability... reducing hydrogen sulfide generation
Implementation Method 3
manufacturing the solid electrolyte including cores including the first electrolyte and shells including the second electrolyte and coated on surfaces of the cores by applying shear stress to the admixture
Data Source
AI summary
Disclosed are a solid electrolyte and method of manufacturing the same. The solid electrolyte may include a core including a first electrolyte represented by Chemical Formula 1, and a shell including a second electrolyte represented by Chemical Formula 2, and disposed on a surface of the core.LiaPSbX1c [Chemical Formula 1]Here, a satisfies an equation 4≤a≤7, b satisfies an equation 3≤b≤7, c satisfies an equation 0≤c≤2, and X1 includes Br or I.LidPSeX2f [Chemical Formula 2]Here, d satisfies an equation 4≤d≤7, e satisfies an equation 3≤e≤7, f satisfies an equation 0≤f≤2, X2 includes Cl or Br, and an ionic radius of X1 is greater than an ionic radius of X2.