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Title: Controlled synthesis of Sb nanostructures and their conversion to CoSb3 nanoparticle chains for li-ion battery electrodes
Authors: Zhu, Jixin
Sun, Ting
Chen, Jun Song
Shi, Wenhui
Zhang, Xiaojun
Lou, David Xiong Wen
Mhaisalkar, Subodh Gautam
Hng, Huey Hoon
Boey, Freddy Yin Chiang
Ma, Jan
Yan, Qingyu
Keywords: DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2010
Source: Zhu, J., Sun, T., Chen, J. S., Shi, W., Zhang, X., Lou, D. X. W., et al. (2010). Controlled Synthesis of Sb Nanostructures and Their Conversion to CoSb3 Nanoparticle Chains for Li-Ion Battery Electrodes. Chemistry of Materials, 22(18), 5333-5339.
Series/Report no.: Chemistry of materials
Abstract: Nanostructured Sb was prepared through a simple polyol process. Either Sb nanoparticles (Sb NP) or nanowires (Sb NW) were obtained by adjusting the concentration of surfactant. Electrochemical analyses revealed that the resultant Sb crystals displayed high charge storage capacities as Li-ion battery electrodes and relatively poor cycling retention during the charge−discharge process. For instance, the capacity was 560−584 mA h/g during the second cycle, which decreased to 120−200 mA h/g during the 70th cycle at a rate of 0.2 C. Thus, Sb NPs were reacted with Co precursors to form one-dimensional (1-D) NP chains wrapped in a polyvinyl pyridine layer, and the length of the NP chains could be adjusted by varying the concentration of polyvinyl pyridine. Through a controlled annealing process, the polyvinyl pyridine layer was converted to amorphous carbon, which led to the formation of 1-D core−shell structures with CoSb3 NP chains entrapped in the carbon layer. Although CoSb3 NP chains with a carbon shell displayed a lower initial charge storage capacity than Sb nanostructures, improved cycling performance was observed. The capacity was 468 mA h/g during the second cycle, which dropped to 421 mA h/g during the 70th cycle at a rate of 0.2 C. Compared to CoSb3 produced via other techniques, CoSb3/C NP chains displayed higher cycling stability, because of the presence of a carbon buffer layer.
DOI: 10.1021/cm101663w
Rights: © 2010 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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