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RISS 인기검색어
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- 저자 : Reddyprakash, M. (검색결과 1 건)
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Choi, Woo Jeong,Reddyprakash, M.,Loka, Chadrasekhar,Jo, Young Woong,Lee, Kee-Sun The Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.3
<P>In this article, we report a novel Si-Metal silicides/Carbon composite anode material for lithium-ion rechargeable batteries. The composite powder comprised of Si, FeSi<SUB>2</SUB> and CrSi<SUB>2</SUB> were synthesized by high-energy mechanical milling and then a primary carbon was formed over the Si-silicide at 900°C. The prepared composite powder was agglomerated and subsequently a thin carbon layer was coated. The X-ray diffraction results revealed that the Si and silicide crystal size decrease with respect to milling time. The critical milling time to achieve the completely nano-scale powders was 5 h. The composite powder exhibits randomly distributed carbon-coated Si-silicide. The TEM microstructure revealed homogeneous distribution of nanocomposite powder consists a very fine nanoparticles of the order of ∼30 nm. The prepared Si-silicide/C composite powders exhibited good capacity retention with an average coulombic efficiency of 99.6%. The composite powders showed good cyclability, 1076 mAh g<SUP>−1</SUP> at 50<SUP>th</SUP> cycle and 959 mAh g<SUP>−1</SUP> at 100<SUP>th</SUP> cycle. The electrode internal microstructure revealed a shell-like carbon-coated Si-silicide phases, and a complete amorphization of nanocrystalline Si during the initial cycling, while the inactive silicide phase remains unchanged. Consequently, the size reduction of Si-silicide and carbon coating over it greatly enhanced the cycling performance of the electrode.</P>
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