SnO2 nanoparticles@polypyrrole nanowires composite as anode materials for rechargeable lithium-ion batteries |
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Authors: | Lifeng CuiJian Shen Fangyi ChengZhanliang Tao Jun Chen |
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Affiliation: | a Institute of New Energy Material Chemistry, Chemistry College, Nankai University, Tianjin 300071, People''s Republic of China b Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Chemistry College, Nankai University, Tianjin 300071, People''s Republic of China |
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Abstract: | The SnO2@polypyrrole (PPy) nanocomposites have been synthesized by a one-pot oxidative chemical polymerization method. The structure, composition, and morphology of the as-prepared SnO2@PPy nanocomposites are characterized by XRD, FTIR, TG, SEM, and TEM. Electrochemical investigations show that the obtained SnO2@PPy nanocomposites exhibit high discharge/charge capacities and favorable cycling when they are employed as anode materials for rechargeable lithium-ion batteries. For the SnO2@PPy nanocomposite with 79 wt% SnO2, the electrode reaction kinetics is demonstrated to be controlled by the diffusion of Li+ ions in the nanocomposite. The calculated diffusion coefficiency of lithium ions in the SnO2@PPy nanocomposite with 79 wt% SnO2 is 6.7 × 10−8 cm2 s−1, while the lithium-alloying activation energy at 0.5 V is 47.3 kJ mol−1, which is obviously lower than that for the bare SnO2. The enhanced electrode performance with the SnO2@PPy nanocomposite is proposed to derive from the advantageous nanostructures that allow better structural flexibility, shorter diffusion length, and easier interaction with lithium. |
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Keywords: | Tin oxide Polypyrrole Lithium-ion battery Nanocomposite Kinetics |
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