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The Anode Challenge for Lithium?Ion Batteries: A Mechanochemically Synthesized Sn?Fe?C Composite Anode Surpasses Graphitic Carbon #MMPMID27812462
Dong Z; Zhang R; Ji D; Chernova NA; Karki K; Sallis S; Piper L; Whittingham MS
Adv Sci (Weinh) 2016[Apr]; 3 (4): ä PMID27812462show ga
Carbon?based anodes are the key limiting factor in increasing the volumetric capacity of lithium?ion batteries. Tin?based composites are one alternative approach. Nanosized Sn?Fe?C anode materials are mechanochemically synthesized by reducing SnO with Ti in the presence of carbon. The optimum synthesis conditions are found to be 1:0.25:10 for initial ratio of SnO, Ti, and graphite with a total grinding time of 8 h. This optimized composite shows excellent extended cycling at the C/10 rate, delivering a first charge capacity as high as 740 mAh g?1 and 60% of which still remained after 170 cycles. The calculated volumetric capacity significantly exceeds that of carbon. It also exhibits excellent rate capability, delivering volumetric capacity higher than 1.6 Ah cc?1 over 140 cycles at the 1 C rate.