Synthesis and electrochemical performance of novel loose structured submicro/micro-sized NiSnx alloy composites for lithium batteries |
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Authors: | Hong Guo Shu Zhao Yisan Chen |
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Affiliation: | a School of Chemistry and Chemical Engineering, Qujing Normal University, Qujing 655000, Yunan, China b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract: | An effective method of carbothermal reduction was employed to prepare spherical microcrystal NiSnx alloy powders from oxides of Sn and Ni used as anode materials for Li-ion battery. According to XRD, SEM and TEM analysis, the synthesized spherical NiSnx powders show a loose submicro/micro-sized structure and a multi-phase composition. The prepared NiSnx alloy composite electrode exhibits a stable discharge capacity of electrode is ca. 380 mAh g−1 at constant current density of 50 mA g−1, and can be retained at 350 mAh g−1 after 25 cycles. Moreover, NiSnx alloys exhibit excellent high rate performance, i.e. stable discharge capacities of 300-310 mAh g−1 and the coulombic efficiencies of 97.5-99.5% have been obtained at the current density of 500 mA g−1. The loose submicro-sized particle structural characteristic and the Ni addition in Sn matrix should be responsible for the improvement of cycling stability of NiSnx electrode. The carbothermal reduction method is simple, low-cost and mass-productive, which should be viable to other alloy composite materials system of rechargeable lithium ion batteries. |
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Keywords: | NiSnx composite Anode materials Carbothermal reduction Li-ion rechargeable batteries |
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