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《Electronic Components and Materials》 2018-05
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Electrochemical performance of nano-silicon prepared with sodium chloride heat-scavenger

DU Jianlong;LIANG Kui;LIAO Xing;YANG hailin;College of Materials Science and Engineering, Hunan University;  
Silicon was regarded as one of the promising anode materials for next generation lithium ion batteries(LIBs)due to its ultrahigh theoretical capacity,abundant resource and environmental friendliness.However,the downsizing of Si to nanoscale dimension was impeded by complicated and expensive methods.Here,the Si nanoparticles are engineered from a magnesiothermic reaction,in which magnesium powder and fumed silica are served as reductant and silicon source,respectively.Sodium chloride is utilized as a heat-scavenger to consume the heat,which generates by the magnesiothermic reduction process.The nano-silicon with an average grain size about 25 nm is successfully obtained,and the yield is as high as 82%.Owing to the small size of the nano-silicon,it exhibits excellent electrochemical performance.The first cycle delithiation capacity is above 1875 m Ah·g~(–1) and the first coulombic efficiency is up to 85%.Furthermore,the delithiation capacity maintains 1007 m Ah·g~(–1) at a current density of 0.6 A·g~(–1) after 50 cycles.
【CateGory Index】: TM912
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