Li-P-S-Zn Solid Electrolyte Without Halogen or Germanium
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Solution Overview
Problem
Existing Li—P—S type sulfide-based solid electrolytes face handling difficulties due to the presence of halogen compounds and high costs associated with germanium, limiting their commercialization and electrochemical stability.
Innovation Solution
A novel sulfide-based solid electrolyte with a P31m space group, specific unit cell parameters, and crystallographic coordinates, composed of lithium, phosphorus, sulfur, and zinc, which excludes halogen and germanium, offering improved electrochemical stability and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogenated compounds are added to Li2S—P2S5 type glass ceramics to increase lithium-ion conductivity, then ion conductivity is improved, but handling difficulty increases
Solution Approach 1:
The patent removes halogenated compounds from the solid electrolyte composition entirely, extracting the harmful element that caused handling difficulties while maintaining lithium-ion conductivity through alternative compositional design using Li2S-P2S5-ZnS system
Solution Approach 2:
The patent changes the compositional parameters by introducing zinc sulfide (ZnS) into the Li2S-P2S5 system, creating a new compositional space that achieves high ion conductivity without requiring halogenated additives, thus resolving the handling issue
2Reliability
If germanium is used in LGPS type solid electrolytes to achieve high ion conductivity, then ion conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive germanium with cheaper zinc sulfide (ZnS) in the solid electrolyte composition, using abundant and low-cost materials to achieve comparable or superior performance, thereby dramatically reducing manufacturing costs
Solution Approach 2:
The patent changes the material composition parameters by substituting Ge with Zn in the LGPS structure, creating a Li-P-S-Zn system that maintains the beneficial crystal structure and ion conductivity while using economically viable materials
3Reliability
If existing Li—P—S type solid electrolytes are used to achieve high ion conductivity, then ion conductivity is improved, but electrochemical stability deteriorates
Solution Approach 1:
The patent creates a composite solid electrolyte system combining Li2S, P2S5, and ZnS in specific ratios, where the synergistic interaction between components enhances both ion conductivity and electrochemical stability, with ZnS providing structural stability and Li2S-P2S5 providing ion conduction pathways
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 novel electrolyte maintains structural stability during lithium intercalation/deintercalation cycles, enhancing battery durability and safety by providing high ion conductivity without halogen or germanium, thus overcoming the limitations of existing materials.
Implementation Method 1
a novel sulfide-based solid electrolyte having a channel facilitating ion conduction by virtue of crystallographic specificity derived from the ordering of metal ion sites and metal ion defects in a unit cell
Data Source
AI summary
The present disclosure relates to a novel material used as a solid electrolyte for an all-solid-state battery. Particularly, the present disclosure relates to a sulfide-based solid electrolyte including lithium, sulfur, phosphorus and zinc elements, and a method for preparing the same.