Open AccessImproved Cycling Performance of Cr x V1−x Si2/Si Composite Electrode for Application to Lithium-Ion Battery Anodes
Author(s) -
Yuta Kimura,
Yasuhiro Domi,
Hiroyuki Usui,
Hiroki Sakaguchi
Publication year - 2022
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/ac4c78
Subject(s) - materials science , anode , electrolyte , electrode , composite number , electrochemistry , lithium (medication) , silicide , chemical engineering , amorphous solid , silicon , metallurgy , composite material , chemistry , crystallography , medicine , engineering , endocrinology
We have evaluated the anode properties of the silicide/Si composite electrodes for lithium-ion batteries and revealed that ternary silicide made by elemental substitution improved the electrochemical performance of the electrodes. In particular, a Cr 0.5 V 0.5 Si 2 /Si composite electrode exhibited a good cycle stability. Herein, we attempted mechanical grinding of the Cr 0.5 V 0.5 Si 2 /Si composite and addition of fluoroethylene carbonate (FEC) into the electrolyte to further improve the performance of the electrode. The electrode showed a superior cycling performance by these attempts as expected. The mechanical grinding should cause the formation of amorphous Si phase and fine dispersion of Cr 0.5 V 0.5 Si 2 in the Si phase, which suppresses the pulverization of the Cr 0.5 V 0.5 Si 2 /Si composite particle during charge-discharge. It is considered that the addition of FEC suppresses the continuous reductive decomposition of the electrolyte, which contributes to the improvement in the cyclability.