Synthesis and Characterization of Nanoporous NiSi-Si Composite Anode for Lithium-Ion Batteries
Resource
Journal of The Electrochemical Society 154 (2): A97-A102
Journal
Journal of The Electrochemical Society
Journal Volume
154
Journal Issue
2
Pages
-
Date Issued
2007
Date
2007
Author(s)
Liu, Wei-Ren
Shieh, Deng-Tswen
Wu, Hung-Chun
Yang, Mo-Hua
Korepp, Christiane
Besenhard, J. O.
Winter, Martin
Abstract
Porous NiSi-Si composite particles having homogeneously distributed intraparticle pores with the size distribution peaked at 200 nm and a porosity of ∼40% have been synthesized by a novel method, which comprises steps of ballmilling induced reaction to form NiNiSiSi preform particles and subsequent dissolution of unreacted Ni. Upon lithiation/delithiation cycling, the composite particle electrode exhibits much reduced thickness expansion and capacity fading rate, as compared with the pure Si particle electrode. The improvements have been attributed to the success in introducing the preset voids to partially accommodate volume expansion arising from Si lithiation. In situ synchrotron XRD further indicates that NiSi of the composite is active toward Li alloying, and it undergoes reversible transformation to/from Ni2 Si and Liy Si. The reversible transformation between the silicides involves volume change in opposite to lithiation of Si, and is beneficial to stabilizing the composite electrode upon charge/discharge cycling. © 2006 The Electrochemical Society.
SDGs
Other Subjects
Capacity fading rate; Delithiation cycling; Reversible transformation; Anodes; Characterization; Electrodes; Lithium batteries; Nickel compounds; Reaction kinetics; Synthesis (chemical); Nanostructured materials
Type
journal article
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