Open AccessSynthesis, Lithium Insertion and Thermal Stability of Si–Mo Alloys
Author(s) -
Simeng Cao,
Shayne Gracious,
Craig Bennett,
M. N. Obrovac
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/abba91
Subject(s) - materials science , alloy , thermal stability , ball mill , phase (matter) , lithium (medication) , temperature cycling , electrochemistry , diffraction , x ray crystallography , metallurgy , analytical chemistry (journal) , thermal , chemical engineering , electrode , chemistry , thermodynamics , medicine , physics , organic chemistry , optics , chromatography , engineering , endocrinology
Li insertion was investigated in Si x Mo 100−x (90 ≥ x ≥ 70, Δx = 10) alloys prepared by mechanical ball milling. X-ray diffraction (XRD) and quantitative phase analysis were used to analyze phase compositions of these Si–Mo alloys, and how these phase compositions changed with milling times. The results of quantitative phase analysis showed that cr-Si converted into a-Si within 1 h during milling, and the Si–Mo reactions were nearly complete after only 4-h milling. During electrochemical cycling, the Si–Mo samples with high initial Mo contents and long milling times displayed good crystalline Li 15 Si 4 suppression and stable cycling performance. In addition, thermal stability of some selected Si–Mo alloys was studied. The Si 80 Mo 20 16 h alloy combines good thermal stability and a high volumetric capacity of about 1300–1400 Ah L −1 after heat treatment at 600 °C or 800 °C, which may allow the alloy to be further improved by carbon coating at high temperature.