Improving Ion Conductivity in Sulfide Solid Electrolytes
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Summary
Problems
Li2S—P2S5—LiI electrolytes often exhibit poor ion-conducting characteristics due to the formation of specific crystalline phases when manufactured using existing methods.
Innovation solutions
Controlling the reaction site temperature during the synthesis of sulfide glass to ensure that the LiI content and temperature satisfy specific formulas, such as y < −2.00x + 1.79 × 10^2, prevents the formation of these crystalline phases, thereby improving the ion-conducting characteristics of the sulfide solid electrolyte.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the mechanical milling method is used to manufacture Li2S—P2S5—LiI electrolytes, then the manufacturing process can be simplified, but the ion-conducting characteristics become poor due to formation of crystalline phases
Why choose this principle:
The patent applies parameter changes by precisely controlling the reaction site temperature during the mechanical milling process. The temperature is maintained below specific thresholds (e.g., y < -2.00x + 1.79×10^2 where x is LiI content and y is temperature) to prevent crystalline phase formation. This temperature parameter control transforms the manufacturing process from one that produces poor ion-conducting crystalline materials to one that produces amorphous materials with excellent ion-conducting characteristics, while still using the simple mechanical milling method.
Principle concept:
If the reaction site temperature is increased to improve productivity, then the manufacturing speed increases, but crystalline phases form which reduce ion conductivity
Why choose this principle:
The patent resolves this contradiction by establishing specific temperature thresholds based on LiI content that enable high productivity without sacrificing ion conductivity. By controlling the reaction site temperature to satisfy formulas such as y < -2.00x + 1.79×10^2, the process achieves rapid amorphization and sulfide glass formation while preventing crystalline phase formation. This allows the manufacturing speed to be maximized within the safe temperature window.
Application Domain
Data Source
AI summary:
Controlling the reaction site temperature during the synthesis of sulfide glass to ensure that the LiI content and temperature satisfy specific formulas, such as y < −2.00x + 1.79 × 10^2, prevents the formation of these crystalline phases, thereby improving the ion-conducting characteristics of the sulfide solid electrolyte.
Abstract
A main object of the present invention is to provide a method for manufacturing a sulfide solid electrolyte that enables a sulfide solid electrolyte whose ion-conducting characteristic is easy to be improved, to be manufactured. The present invention is a method for manufacturing a sulfide solid electrolyte including loading a raw material for manufacturing a sulfide solid electrolyte which is mainly composed of a substance represented by the general formula of (100-x)(0.75Li 2 S.0.25P 2 S 5 ).xLiI (here, 0<x<100), into a vessel; and amorphizing the raw material after said loading, wherein a reaction site temperature in the vessel is controlled so that x included in the general formula and the reaction site temperature y [° C.] in the vessel in said amorphizing satisfy y<−2.00x+1.79×10 2 .