Facile simultaneous polymerization enabled in-situ confinement of size-tailored GeO2 nanocrystals in continuous S-Doped carbons for lithium storage |
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Authors: | Xiaoyan Han Pengyuan Gao Shuyi Deng Peng Mei Qing Zhang Yingkui Yang |
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Institution: | 1. Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, 430074, China;2. Hubei Engineering Technology Research Center for Energy Polymer Materials, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan, 430074, China |
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Abstract: | GeO2 is a promising anode material for lithium ion batteries due to its high theoretical capacity (1126 mAh g?1 for reversibly storing 4.4 Li+), and moderately low operating voltage (<1.5 V). Nevertheless, the fabrication of truly durable GeO2 anode with satisfactory rate capability and cycling stability remains a big challenge because of its inherent low conductivity, and the large volume expansion upon charge-discharge that causes severe capacity fading. In this study, an innovative nanostructure with size-adjustable GeO2 nanoparticles (16–26 nm) embedded in continuous S-doped carbon (GeO2/S-doped carbon, GSC) has been successfully fabricated via a facile in-situ simultaneous polymerization method followed by heat treatment. The electrochemical results indicate that the as-prepared GSC composites show high reversible capacity (672.9 mAh g?1 at 50 mA g?1), superior rate capability (332.9 mAh g?1 at 1000 mA g?1), and long-term cycle life (179 mAh g?1 after 500 cycles at 1000 mA g?1) as anode materials for lithium ion batteries. The excellent electrochemical performance of GSC nanocomposites could be ascribed to the homogeneous and continuous S-doped carbon matrix, which provides shortened ion diffusion pathway, increased electrical conductivity, enhanced structural stability, and introduced surface/interface property. |
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Keywords: | Germanium dioxide Nanocomposites Heteroatom-doping Size tunability Anode materials |
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