Composite Solid Electrolyte for High-Temperature Li-Ion Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solid electrolytes, particularly oxide-based ones, face challenges with low lithium ion conductivity and high-temperature stability, limiting the performance of lithium-ion batteries.
Innovation Solution
A solid electrolyte composition and production method involving a mixture of Li3AlF6 and inorganic salts like Li2SO4 or LiPO3, subjected to mechanical milling, which enhances lithium ion conductivity and maintains stability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oxide-based solid electrolyte materials are used, then high-temperature stability is improved, but lithium ion conductivity deteriorates
Solution Approach 1:
The patent combines oxide-based solid electrolyte (providing high-temperature stability) with sulfide-based solid electrolyte (providing high lithium ion conductivity) to create a composite solid electrolyte. This merging allows the final material to simultaneously achieve both high-temperature stability and high lithium ion conductivity, resolving the contradiction between these two properties.
Solution Approach 2:
The patent develops a composite solid electrolyte consisting of oxide-based solid electrolyte particles and sulfide-based solid electrolyte particles. By creating a composite material that integrates the advantages of both oxide and sulfide-based electrolytes, the invention achieves high lithium ion conductivity while maintaining high-temperature stability, thus resolving the technical contradiction.
2Reliability
If sulfide-based solid electrolyte materials are used, then lithium ion conductivity is improved, but high-temperature stability deteriorates
Solution Approach 1:
The patent combines oxide-based solid electrolyte (providing high-temperature stability) with sulfide-based solid electrolyte (providing high lithium ion conductivity) to create a composite solid electrolyte. This merging allows the final material to simultaneously achieve both high-temperature stability and high lithium ion conductivity, resolving the contradiction between these two properties.
Solution Approach 2:
The patent develops a composite solid electrolyte consisting of oxide-based solid electrolyte particles and sulfide-based solid electrolyte particles. By creating a composite material that integrates the advantages of both oxide and sulfide-based electrolytes, the invention achieves high lithium ion conductivity while maintaining high-temperature stability, thus resolving the technical contradiction.
3Reliability
If mechanical milling process is applied to Li3AlF6 and LiCl, then lithium ion conductivity is improved, but high-temperature stability deteriorates
Solution Approach 1:
The patent combines oxide-based solid electrolyte (providing high-temperature stability) with sulfide-based solid electrolyte (providing high lithium ion conductivity) to create a composite solid electrolyte. This merging allows the final material to simultaneously achieve both high-temperature stability and high lithium ion conductivity, resolving the contradiction between these two properties.
Solution Approach 2:
The patent develops a composite solid electrolyte consisting of oxide-based solid electrolyte particles and sulfide-based solid electrolyte particles. By creating a composite material that integrates the advantages of both oxide and sulfide-based electrolytes, the invention achieves high lithium ion conductivity while maintaining high-temperature stability, thus resolving the technical contradiction.
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 exhibits higher lithium ion conductivity and high-temperature stability, ensuring reliable performance even at temperatures above 120°C, with lithium ion conductivity of at least 1.0×10−4 S/cm at 150°C.
Implementation Method 1
the first solidifying agent and the second solidifying agent are subjected to a mechanical milling process
Data Source
AI summary
A solid electrolyte is composed primarily of a component expressed by a composition formula of Lia+dMbXcAeOf by using values a to f that are greater than 0, where M is an element serving as a trivalent cation, X is a halogen element, and A is a sulfur element or a phosphorus element, wherein 0.8c≤(a+3b)≤1.2c and 1.6f≤(d+n×e)≤2.4f are satisfied, where when A is a sulfur element, n is 4 or 6, and when A is a phosphorus element, n is 5.