Nanostructured Ni3.5Sn4 intermetallic compound: An efficient buffering material for Si-containing composite anodes in lithium ion batteries

作者：Edfouf Z; Fariaut Georges C; Cuevas F^*; Latroche M; Hezeque T; Caillon G; Jordy C; Sougrati M T; Jumas J C

来源：Electrochimica Acta, 2013, 89: 365-371.

DOI：10.1016/j.electacta.2012.11.078

• Lithium ion battery
• Intermetallics
• Ni3Sn4
• Mechanical milling
• Nanostructuration

Recently, Ni3.5Sn4 intermetallic has been reported as an efficient buffering material for Si-containing composite negative electrodes used in Li-ion batteries. In the present work, the electrochemical properties of this Ni-overstoichiometric compound are studied in detail. Micrometric, nanosized and carbon-added nanosized Ni3.5Sn4 have been investigated. For all materials, very good cycle life is obtained over more than 400 cycles. Nanosized Ni3.5Sn4 with crystallite size of 6 nm exhibits a reversible capacity of 240 mAh g(-1), ten times higher than for the micrometric state. Moreover, nanosized Ni3.5Sn4 exhibits high-rate capability with 80% of full discharge capacity at 16C. Carbon addition slows down kinetics but increases the reversible capacity up to 273 mAh g(-1). The electrochemical properties of nanostructured Ni3.5Sn4 phase make it a promising constituent for composite anodes of Li-ion batteries.

• 出版日期2013-2-1