Control of the carbon shell thickness in Sn70Ge30@carbon core-shell nanoparticles using alkyl terminators: Its implication for high-capacity lithium battery anode materials
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- Control of the carbon shell thickness in Sn70Ge30@carbon core-shell nanoparticles using alkyl terminators: Its implication for high-capacity lithium battery anode materials
- Cho, Jaephil
- Anode; Carbon; Cycle life; Li-ion; Nanoalloy
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- ELECTROCHIMICA ACTA, v.54, no.2, pp.461 - 466
- This paper describes the synthesis and electrochemical characterization of Sn70Ge30@carbon core-shell nanoparticles prepared by vacuum annealing of the alkyl-capped Sn70Ge30 nanoparticles obtained from the reaction of SnCl4 and GeCl4 with sodium naphthalide in ethylene glycol dimethyl ether (glyme) and RLi (R = butyl, ethyl, methyl). The Sn70Ge30@carbon core-shell nanoparticles have different core sizes and shell thicknesses depending on the alkyl terminator. The annealed nanoparticles that terminate with butyl and ethyl groups have core sizes of ∼14 and ∼17 nm with carbon shell thicknesses of ∼16 and ∼8 nm, respectively. On the other hand, annealed nanoparticles that terminate with methyl groups have core sizes of 40 nm with a very thin carbon shell without uniform coverage of the core. Electrochemical characterization shows that nanoparticles prepared using butyl terminators have the highest capacity retention out to 40 cycles (95%) and a first charge capacity of 1040 mAh/g. On the other hand, ethyl- and methyl-capped nanoparticles show 82 and 64% capacity retention after 40 cycles.
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