Solid Electrolyte Production Using Branched Ester Complexing Agent
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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 production method involving a complexing agent with an ester group and at least one branch is used to mix with solid electrolyte raw materials containing lithium, sulfur, phosphorus, and halogen elements, forming an electrolyte precursor that is then processed to achieve high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a liquid-phase method is used to produce solid electrolyte, then the synthesis can be performed simply and in large amount, but the ionic conductivity is reduced 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 direct decomposition and separation of electrolyte components during deposition, thereby maintaining high ionic conductivity while enabling simple large-scale synthesis through liquid-phase methods
Solution Approach 2:
The patent modifies the chemical environment parameters by introducing specific complexing agents that change the coordination chemistry of the system. This parameter change allows the liquid-phase method to produce solid electrolytes with high ionic conductivity by controlling the deposition process to prevent component separation
2Stability of the object's composition
If a homogeneous liquid-phase method is used, then complete dissolution and homogeneous dispersion is achieved, but components separate during deposition according to inherent solubility
Solution Approach 1:
The complexing agent acts as an intermediary that maintains homogeneous dispersion of components during the deposition process. It coordinates with metal ions to prevent preferential precipitation, thereby avoiding component separation while preserving the homogeneous dispersion achieved during dissolution
3Quantity of substance
If strong affinity between solvent and lithium is used, then dissolution is enhanced, but solvent removal becomes difficult and ionic conductivity is lowered
Solution Approach 1:
The complexing agent serves as an intermediary that mediates between the solvent and lithium ions. It allows efficient dissolution by facilitating solvent-lithium interaction while simultaneously enabling easier solvent removal through controlled complexation, thereby preserving ionic conductivity
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
This method enables the production of solid electrolytes with enhanced ionic conductivity and stability, effectively addressing the limitations of traditional liquid-phase methods while maintaining the benefits of a solid-state battery.
Implementation Method 1
mixing a complexing agent having an ester group and also having at least one branch with a solid electrolyte raw material
Data Source
AI summary
The present invention provides a production method of a solid electrolyte containing a lithium element, a sulfur element, a phosphorous element, and a halogen element, wherein the solid electrolyte has a high ionic conductivity and capable of suppressing hydrogen sulfide by adopting a liquid-phase method, wherein the method includes mixing a complexing agent having an ester group and also having at least one branch with a solid electrolyte raw material. The present invention also relates to an electrolyte precursor.