Halogen Sulfide Solid Electrolyte for Thermal Stability and Contact
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Solution Overview
Problem
Existing solid-state electrolyte materials face challenges in achieving high thermal stability and effective contact with active materials in batteries, limiting their performance.
Innovation Solution
A solid-state electrolyte material comprising lithium, phosphorus, sulfur, and a halogen with a unique structure characterized by an 86.6 ppm 31P shift in NMR spectra, formed through a process involving mixing precursors, milling, drying, and heat treatment, to create a sulfide electrolyte with a PS4−3Cl− chemical building block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If argyrodite structure materials are used to achieve high ionic conductivity, then ionic conductivity is improved, but thermal stability deteriorates due to decomposition at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a halogen element (X = F, Cl, Br, I) into the Li-B-S-O system, creating a new solid electrolyte material with formula Li10−x−yBnO3−n/2−x/2−y/2S3−n−x/2−y/2Xx where 0.1 ≤ x ≤ 3 and 0.1 ≤ n ≤ 3. This compositional parameter change enables the material to achieve both high ionic conductivity and high thermal stability, resolving the contradiction between the two properties that plagues conventional argyrodite materials.
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining lithium, boron, sulfur, oxygen, and halogen elements in a specific ratio within a new crystal structure. This composite approach, represented by the formula Li10−x−yBnO3−n/2−x/2−y/2S3−n−x/2−y/2Xx, integrates multiple elements to achieve synergistic effects that simultaneously provide high ionic conductivity and high thermal stability, overcoming the limitations of single-element or simpler composite materials.
2Stability of the object's composition
If solid electrolyte materials are used to improve thermal stability compared to liquid electrolytes, then thermal stability is improved, but contact with active materials deteriorates due to material hardness
Solution Approach 1:
The patent modifies the physical and chemical parameters of the solid electrolyte by incorporating halogen elements and optimizing the Li-B-S-O ratio, which changes the material's hardness and mechanical properties. This parameter optimization enables the solid electrolyte to maintain good contact with electrode materials while preserving its thermal stability advantage over liquid electrolytes.
Solution Approach 2:
The patent creates local quality variations in the solid electrolyte material by distributing halogen elements and optimizing the nanoscale structure, which improves interfacial contact properties at the electrode-electrolyte interface while maintaining bulk thermal stability. This local optimization resolves the contradiction between overall thermal stability and local contact quality.
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 new electrolyte material exhibits high thermal stability and improved contact with battery layers, enhancing the performance of solid-state batteries.
Implementation Method 1
Solid electrolytes may have challenges related to ionic conductivity
Implementation Method 2
performing a heat treatment by heating the dry powder to a heat treatment temperature within a range of about 200° C. to about 300° C. and maintaining the dry powder at the heat treatment temperature for about 30 minutes to about 120 minutes, to form a solid-state electrolyte material
Data Source
AI summary
A sulfide electrolyte having a P chemical building block, a solid-state battery containing the sulfide electrolyte having a P chemical building block, and a method of making the same. The sulfide electrolyte having a P chemical building block contains at least lithium (Li), sulfur(S), phosphorus (P), and a halogen, and has a structure characterized by an 86.6 ppm 31P shift in a 31P NMR spectra. In some preferred embodiments, the sulfide electrolyte having a P chemical building block may include chlorine, present in a unique PS43−—Cl− chemical building block.