Solid Electrolyte Synthesis Using Complexing Agents
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Solution Overview
Problem
Conventional liquid-phase methods for producing solid electrolytes face challenges in achieving high ionic conductivity due to decomposition and separation issues during the deposition process, leading to reduced performance compared to solid-phase methods.
Innovation Solution
A method involving the use of a complexing agent with a heterocyclic compound containing 2 or more heteroatoms, such as N-methylmorpholine or N,N′-dimethylpiperazine, is employed to mix with solid electrolyte raw materials like lithium sulfide and diphosphorus pentasulfide, promoting the formation of a solid electrolyte with a PS43− skeleton and thio-LISICON Region II-type crystal structure, which enhances ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid-phase method is used to produce solid electrolyte, then manufacturing simplicity and productivity are improved, but ionic conductivity deteriorates due to decomposition and separation during deposition
Solution Approach 1:
The patent introduces a complexing agent as an intermediary substance that coordinates with metal ions during the liquid-phase synthesis process. This complexing agent prevents decomposition and separation of solid electrolyte components during deposition, maintaining homogeneous distribution of ions while enabling liquid-phase processing advantages.
2Reliability
If solid-phase method is used to produce solid electrolyte, then ionic conductivity is improved through high purity solid electrolyte, but manufacturing complexity and reduced productivity result from mechanical milling treatment
Solution Approach 1:
The patent replaces the mechanical milling process with a chemical synthesis approach using liquid-phase reaction and complexing agents. This substitution eliminates the need for complex mechanical treatment equipment while achieving comparable or superior ionic conductivity through controlled chemical deposition.
3Reliability
If complexing agent is added in liquid-phase method, then ionic conductivity is improved by preventing decomposition, but process complexity increases
Solution Approach 1:
The patent optimizes parameters such as complexing agent concentration, pH level, temperature, and reaction time to achieve effective solid electrolyte formation with minimal process complexity. By carefully controlling these parameters, the method maintains simplicity while improving ionic conductivity through prevention of decomposition.
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 approach results in a solid electrolyte with improved ionic conductivity, suppressing hydrogen sulfide generation and maintaining high performance, suitable for battery applications.
Implementation Method 1
mixing a complexing agent and a solid electrolyte raw material... the complexing agent is a heterocyclic compound having a hetero ring containing 2 or more hetero atoms
Implementation Method 2
a method in which raw materials, such as liquid sulfide and diphosphorus pentasulfide are subjected to mechanical milling treatment using an apparatus, such as a ball mill and a bead mill and optionally subjected to heat treatment, thereby producing an amorphous or crystalline solid electrolyte
Implementation Method 3
the complexing agent is a heterocyclic compound having a hetero ring containing 2 or more hetero atoms... suppressing hydrogen sulfide generation and maintaining high performance
Data Source
AI summary
According to a method for producing a solid electrolyte that contains a lithium atom, a sulfur atom, a phosphorus atom and a halogen atom, including mixing a complexing agent and a solid electrolyte raw material, a solid electrolyte having a high ionic conductivity is provided using a liquid-phase method.