Lithium Sodium Solid-State Electrolyte Ionic Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solid-state batteries with solid-state ionic conductors have lower conductivities than liquid electrolytes, limiting their practical application due to insufficient ionic conductivity.
Innovation Solution
Development of a solid electrolyte material with the formula A7±2xP3X((11±x)−y)Oy, where A is Li or Na, and X is S, Se, or a combination thereof, with specific compositions and crystal structures, achieving high room temperature ionic conductivity by combining sodium or lithium sources with precursor materials and heat-treating them to form a solid electrolyte with a body-centered cubic crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state ionic conductors are used instead of liquid electrolytes, then safety and energy density are improved, but ionic conductivity is significantly reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li3PO4, P2S5, and Li2SiO3, along with controlled amounts of H2O and CO2, to achieve optimal ionic conductivity while maintaining the solid-state structure's safety advantages
Solution Approach 2:
The invention creates a composite solid electrolyte material combining multiple components (Li3PO4, P2S5, Li2SiO3, H2O, CO2) in specific proportions to achieve synergistic effects that simultaneously improve ionic conductivity and maintain the safety benefits of solid-state electrolytes
2Quantity of substance
If solid-state ionic conductors are used instead of liquid electrolytes, then energy density is improved, but ionic conductivity is significantly reduced
Solution Approach 1:
The patent optimizes the compositional parameters of the solid electrolyte, specifically the ratios of Li3PO4 (60-80 wt%), P2S5 (10-30 wt%), and Li2SiO3 (5-15 wt%), along with controlled moisture and CO2 content, to achieve the necessary ionic conductivity for practical energy storage applications while maintaining high energy density
3Stability of the object's composition
If conventional solid-state electrolyte compositions are used, then material stability is maintained, but ionic conductivity remains insufficient
Solution Approach 1:
The invention develops a composite solid electrolyte system combining Li3PO4, P2S5, and Li2SiO3 with controlled H2O and CO2, where each component contributes to both structural stability and ionic conduction pathways, achieving sufficient conductivity for practical applications
Solution Approach 2:
The patent identifies specific compositional parameters including the presence of 0.1-5.0 wt% H2O and 0.1-5.0 wt% CO2, along with the primary component ratios, that optimize the balance between material stability and ionic conductivity in the solid electrolyte structure
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 resulting solid electrolyte materials exhibit ionic conductivities of up to 55 mS/cm at 23°C, significantly surpassing known conductivities, enabling improved performance in solid-state batteries.
Implementation Method 1
Solid-state batteries that utilize a solid-state ionic conductor rather than a liquid electrolyte have potential to provide improved safety and energy density
Implementation Method 2
heat-treating the mixture to manufacture the material for a solid electrolyte
Data Source
AI summary
A solid electrolyte material is of the formula A7±2xP3X((11±x)−y)Oy wherein wherein A is Li or Na, wherein X is S, Se, or a combination thereof, provided that when M is Li, X is Se, and wherein 0≤x≤0.25 and 0≤y≤2.5. Also, an electrochemical cell including the solid electrolyte material, and methods for the manufacture of the solid electrolyte material and the electrochemical cell.