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Li2MnSiO4/Carbon Composite Nanofibers as a High-Capacity Cathode Material for Li-Ion Batteries

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Author(s): Shu Zhang | Ying Li | Guanjie Xu | Shuli Li | Yao Lu | Ozan Topracki | Xiangwu Zhang

Journal: Soft Nanoscience Letters
ISSN 2160-0600

Volume: 02;
Issue: 03;
Date: 2012;
Original page

Keywords: Electrospinning | Li2MnSiO4 | Carbon Nanofibers | Li-Ion Battery

ABSTRACT
Li2MnSiO4 has an extremely high theoretical capacity of 332 mAh?g?1. However, only around half of this capacity has been realized in practice and the capacity retention during cycling is also low. In this study, Li2MnSiO4/carbon composite nanofibers were prepared by a combination of electrospinning and heat treatment. The one-dimensional continuous carbon nanofiber matrix serves as long-distance conductive pathways for both electrons and ions. The composite nanofiber structure avoids the aggregation of Li2MnSiO4 particles, which in turn enhances the electrode conductivity and promotes the reaction kinetics. The resultant Li2MnSiO4/carbon composite nanofibers were used as the cathode material for Li-ion batteries, and they delivered high charge and discharge capacities of 218 and 185 mAh?g?1, respectively, at the second cycle. In addition, the capacity retention of Li2MnSiO4 at the first 20th cycles increased from 37% to 54% in composite nanofibers.

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