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Preparation of PAN-based carbon fiber@MnO2 composite as an anode material for structural lithium-ion batteries

Han, Qigang, Zhang, Wenqiang, Han, Zhiwu, Wang, Fangxue, Geng, Di, Li, Xiang, Li, Yao, Zhang, Xu
Journal of materials science 2019 v.54 no.18 pp. 11972-11982
anodes, carbon, electrochemistry, lithium, lithium batteries, manganese dioxide, synergism
Carbon fiber@MnO₂ composite (CF@MnO₂) has been successfully synthesized based on the redox mechanism, and the morphological and electrochemical features are also studied. As a promising anode material for structural lithium-ion batteries (SLIBs), CF@MnO₂ composite presents a coulombic efficiency of over 99% and good cyclic ability. It performs a high reversible capacity of 648 mAh g⁻¹ after 150 cycles at a current density of 100 mA g⁻¹, approximately 2.5 times as high as the pure CF (~ 260 mAh g⁻¹). Moreover, the images of attained composite after the cycle show the fibrous structure do not change much, which verifies it retains good cycle stability. The superior electrochemical performance of the CF@MnO₂ composite can be attributed to the unique hierarchy architecture and the synergistic effect between MnO₂ and CF, which can effectively alleviate the volume expansion of MnO₂ during the lithium insertion/extraction.