LiaPbSc Solid Electrolyte for Lithium-Sulfur Battery
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Solution Overview
Problem
Current lithium sulfur secondary batteries face challenges with electrochemical stability and lithium ion conductivity, particularly in organic solvents, which affect battery performance.
Innovation Solution
An electrolyte solution is developed using a lithium ion conductive solid electrolyte represented by LiaPbSc, dissolved in an organic solvent like tetrahydrofuran, providing improved solubility and conductivity, and including additives for enhanced charging/discharging characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If inorganic solid electrolytes are used to provide high thermal resistance and electrochemical stability, then stability is improved, but solubility in organic solvent deteriorates (available solid electrolytes do not dissolve in organic solvent)
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li2S, P2S5, and Li3PO4 to create a composite material that achieves both solubility in organic solvents and electrochemical stability. This parameter optimization allows the electrolyte to dissolve properly while maintaining stability.
Solution Approach 2:
The patent uses a composite solid electrolyte material combining Li2S-P2S5-Li3PO4 system that integrates the advantages of different components: Li2S-P2S5 provides ionic conductivity while Li3PO4 enhances stability. This composite structure enables both solubility in organic solvents and electrochemical stability simultaneously.
2Reliability
If sulfide-based solid electrolytes are used to achieve lithium ion conductivity, then conductivity is improved, but electrochemical stability deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system where Li2S-P2S5 provides high lithium ion conductivity through sulfide-based fast ion conduction mechanisms, while Li3PO4 components enhance electrochemical stability. The synergistic combination resolves the contradiction between conductivity and stability.
Solution Approach 2:
The patent optimizes the compositional parameters and ratio of sulfide to phosphate components to balance conductivity and stability. By controlling the concentration and structural parameters of the Li2S-P2S5-Li3PO4 system, the electrolyte achieves sufficient lithium ion conductivity while maintaining electrochemical stability in the organic solvent environment.
3Reliability
If conventional electrolytes are used to provide lithium ion conductivity, then conductivity is achieved, but battery performance deteriorates
Solution Approach 1:
The patent changes the electrolyte composition from conventional lithium salts to a Li2S-P2S5-Li3PO4 solid electrolyte system dissolved in organic solvent, optimizing parameters such as ionic conductivity, solubility, and electrochemical window to achieve superior battery performance including higher capacity and efficiency.
Solution Approach 2:
The patent employs a composite electrolyte formulation combining solid electrolyte components with organic solvent, creating a hybrid system that delivers both adequate lithium ion conductivity and enhanced battery performance through improved solubility and electrochemical stability compared to conventional electrolytes.
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 solution achieves high electrochemical stability and sufficient lithium ion conductivity, leading to improved battery performance with increased capacity and efficiency.
Implementation Method 1
a lithium ion conductive solid electrolyte that has sufficient solubility in an organic solvent
Implementation Method 2
an electrolyte that has sufficient solubility in an organic solvent and has a lithium ion conductivity equal to that of an electrolyte including a lithium salt
Data Source
AI summary
An electrolyte for a secondary battery, the electrolyte including: an organic solvent; and a lithium ion conductive solid electrolyte represented by the formulaLiaPbSc wherein 3<a<5, 1<b<3, and 6<c<8, and wherein at least a portion of the solid electrolyte is dissolved in the organic solvent.