Halogen-Free Sulfide Solid Electrolyte for Stable Li-Ion Conduction
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Solution Overview
Problem
Existing Li-P-S type sulfide-based solid electrolytes face handling difficulties due to halogen compounds and high germanium costs, 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, zinc, phosphorus, and sulfur, free from halogen and germanium, allowing for high lithium-ion conductivity and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Li3PO4 is sintered at high temperature (900-1100°C) to achieve high ionic conductivity, then Li ion conductivity is improved, but energy consumption increases and particle sintering occurs making handling difficult
Solution Approach 1:
The patent changes the sintering temperature parameter from conventional high temperature (900-1100°C) to a lower temperature range (600-800°C) while achieving comparable or superior ionic conductivity through compositional optimization. This parameter change reduces energy consumption and prevents excessive particle sintering while maintaining the desired functional properties of the electrolyte material.
2Reliability
If Li3PO4 is sintered at high temperature to achieve high ionic conductivity, then Li ion conductivity is improved, but particle sintering occurs making handling difficult
Solution Approach 1:
The patent reduces the sintering temperature parameter to 600-800°C, which prevents excessive particle sintering and maintains good particle morphology. This makes the material easier to handle, sieve, and process while achieving the required ionic conductivity through optimized composition rather than relying on high-temperature sintering.
3Reliability
If Li3PO4 is sintered at high temperature to achieve high ionic conductivity, then Li ion conductivity is improved, but production cost increases
Solution Approach 1:
The patent changes the sintering temperature parameter to a lower range (600-800°C), which reduces energy consumption and production costs. The method achieves high ionic conductivity through compositional optimization (adding Li2SiO3 and controlling Li2CO3 content) rather than relying on high-temperature processing, thereby reducing manufacturing costs while maintaining product performance.
4Ease of manufacture
If Li2SiO3 is added to Li3PO4 to improve sinterability and reduce sintering temperature, then handling ease is improved, but Li ion conductivity may be reduced
Solution Approach 1:
The patent uses Li2SiO3 as a sintering aid that locally improves sinterability and promotes grain growth without significantly affecting the bulk ionic conductivity. The Li2SiO3 forms at grain boundaries and interfaces, facilitating sintering at lower temperatures while the bulk Li3PO4 phase maintains its high ionic conductivity properties.
Solution Approach 2:
The patent creates a composite material system combining Li3PO4 with Li2SiO3 and controlled Li2CO3 content. This composite approach leverages the complementary properties of each component: Li3PO4 provides high ionic conductivity, Li2SiO3 improves sinterability and reduces sintering temperature, and Li2CO3 controls particle morphology. The synergistic combination achieves both good processability and high performance.
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 provides stable ion conduction and improved durability in lithium-ion batteries, overcoming handling and cost issues of previous electrolytes.
Implementation Method 1
it has been known that Li2SiO3 can be used as a sintering aid for Li3PO4
Implementation Method 2
solid electrolytes having a lithium phosphate-based composition... have come into prominence as solid electrolytes capable of exhibiting high Li ion conductivity
Data Source
Figure 1a~1c
Figure 2~3
Figure 4~5
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.