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Citation: SUN Ming-Ming, ZHANG Shi-Chao. Preparation and Performance of a Three-dimensional Nano-Sn/SnSb Composite Anode for LithiumIon Batteries[J]. Acta Physico-Chimica Sinica, ;2007, 23(12): 1937-1942. doi: 10.3866/PKU.WHXB20071220 shu

Preparation and Performance of a Three-dimensional Nano-Sn/SnSb Composite Anode for LithiumIon Batteries

1.
School of Materials Science and Engineering, Beihang University, Beijing 100083, P. R. China

Received Date: 17 September 2007
Available Online: 25 October 2007

A novel three-dimensional composite anode was prepared by using three-dimensional copper foil with micro-holes for collector and nano-Sn/SnSb alloys powders for active materials. The nano-Sn/SnSb alloys were synthesized by liquid chemical reduction methods at low temperature and the collector was obtained via multiple-step electrodeposition. Advantages of the new three-dimensional composite anode were investigated by comparing its electrochemical performance with that of normal planar anode: three-dimensional structure of the electrode enhanced the combination between active materials and the collector, which increased the possibility for the preparation of anode without binder; the novel anode effectively buffered the volume expansion of high capability active materials during charge/discharge cycles and therefore increased the capacity retention of the electrode. Compared to 33%of the initial charge capacity of normal anode after 30 cycles, the capacity retention of three-dimensional composite anode was 41% of the initial charge capacity; special structure provided a well environment for transferring charge, which made the process of the reaction more complete and therefore higher capacity. The initial specific charge capacity of normal anode was 480 mAh·g-1 and that of three-dimensional composite anode achieved 800 mAh·g-1. The advantages and attractive electrochemical performance of the three-dimensional nano-Sn/SnSb composite anode provide a new thought for structure design and development of anode for lithiumion battery.
- Three-dimensional copper foil collector; Nano-Sn/SnSb alloys; Three-dimensional composite anode; Binders; Conductive agents
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