Mechanical Milling Synthesis and Electrochemical Evaluation of Silicon-transition Metal Alloy Anode Materials for Lithium-ion Batteries

Silicon-alloys are candidates for anode materials of high capacity lithium-ion batteries. Here we report the mechanical milling (mechanical alloying) synthesis of various silicon-alloy samples. The samples have been characterized by X-ray diffraction, scanning electron and transmission electron micr...

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Published inDenki kagaku oyobi kōgyō butsuri kagaku Vol. 83; no. 6; p. 445
Main Authors KAWAKAMI, Soichiro, KAIDOU, Hiroya, AKITA, Yasuhiro, MUNAKATA, Hirokazu, KANAMURA, Kiyoshi
Format Journal Article
LanguageJapanese
Published 2015
Subjects
Alloying effects
Anodes
Electrodes
Lithium
Lithium-ion batteries
Mechanical milling
Rechargeable batteries
Synthesis
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Summary:Silicon-alloys are candidates for anode materials of high capacity lithium-ion batteries. Here we report the mechanical milling (mechanical alloying) synthesis of various silicon-alloy samples. The samples have been characterized by X-ray diffraction, scanning electron and transmission electron microscopies, and electrochemical tests to investigate their electrochemical lithium insertion-extraction performance. The metallic elements added during alloying such as Ni, Co, Cu, and Zr are found to be effective for nanocrystallization or amorphization of silicon alloy. Especially Si-Sn-Cu alloy has high 1st lithium storage capacity of 2690 mAh g-1 with a coulombic efficiency of 85% and relatively long cycle life. The changes of Si-Sn-Cu alloy composite electrode in volume and structure were also investigated to obtain insights for practical electrode design.
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ISSN:1344-3542
DOI:10.5796/electrochemistry.83.445