Communication—Solid-State Synthesis of Lithium Silicide. (10th August 2020)

• Record Type: Journal Article
• Authors: Balogh, Michael P.; Jimenez, Niccolo P.; Salvador, James R.; Halalay, Ion C.
• Is Part Of: ECS journal of solid state science and technology. Volume 9:Number 6(2020)
• Publication Date: 2020-08-10
• Subjects: Batteries - Li-ion -- Energy Storage -- Silicon; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2162-8777/abaaf2
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : Lithium silicide (Li-Si) compounds were synthesized by a reaction between ball-milled commercially available micron sized precursor powders of lithium hydride and silicon. The reaction occurs at ≤500 °C, with the composition controlled by the LiH-to-Si ratio. The products are crystalline equilibrium phases found in the Li-Si phase diagram. The synthesized Li-Si material has a particle size akin to that in the precursor Si, thus eliminating the need for attrition processing before electrode fabrication. Furthermore, the crack-free Li-Si particles may reduce gassing and improve capacity retention in cells. Synthesized Li-Si was also found to be relatively stable during handling in ambient air.