High performance Si/C@CNF composite anode for solid-polymer lithium-ion batteries |
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Authors: | Q. SiK. Hanai T. IchikawaA. Hirano N. ImanishiO. Yamamoto Y. Takeda |
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Affiliation: | Department of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan |
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Abstract: | The electrochemical performance of a composite of nano-Si powder and a pyrolytic carbon of polyvinyl chloride (PVC) with carbon nanofiber (CNF) was examined as an anode for solid-polymer lithium-ion batteries. Nano-Si powder was firstly coated with carbon by pyrolysis of PVC and then mixed with CNF (referred to as Si/C@CNF) using a rotation mixer. The composite exhibited good cycling performance, but suffered from a large irreversible capacity loss of which the retention was less than 60%. In order to reduce the loss, a thin lithium sheet was attached to the Si/C@CNF electrode surface as a reducing agent. The irreversible capacity of the first cycle was lowered to as much as 0 mAh g−1 and after the third cycle, the lithium insertion and extraction efficiency was almost 100%. A reversible capacity of more than 1000 mAh g−1 was still maintained after 40 cycles. |
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Keywords: | PEO-based electrolyte Lithium-ion battery Si/C@CNF composite Irreversible capacity Safety |
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