Cr-doped Li2MnSiO4/carbon composite nanofibers as high-energy cathodes for Li-ion batteries

Shu Zhang; Zhan Lin; Liwen Ji; Ying Li; Guanjie Xu; Leigang Xue; Shuli Li; Yao Lu; Ozan Toprakci; Xiangwu Zhang

doi:10.1039/C2JM32213G

Cr-doped Li₂MnSiO₄/carbon composite nanofibers as high-energy cathodes for Li-ion batteries

Shu Zhang,^a Zhan Lin,^a Liwen Ji,^a Ying Li,^a Guanjie Xu,^a Leigang Xue,^a Shuli Li,^a Yao Lu,^a Ozan Toprakci^a and Xiangwu Zhang*^a

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^a Fiber and Polymer Science Program, Department of Textiles Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA
E-mail: xiangwu_zhang@ncsu.edu
Tel: +1 919-515-6547

Abstract

Li₂MnSiO₄ with an extremely high theoretical capacity of 332 mA h g⁻¹ has recently gained tremendous interest. However, only around half of this capacity has been realized in practice and the cycling performance is also poor due to the low intrinsic conductivity and unsatisfactory structure stability. In this study, Li₂Mn_(1−x)Cr_xSiO₄/carbon composite nanofibers are prepared by the combination of electrospinning and Cr doping. The electrospinning process leads to the formation of a conductive carbon nanofiber matrix, which provides fast ion transport and charge transfer. Cr doping further improves crystal structure stability by increasing the unit cell volume and inducing defects in the lattice. The resultant Li₂Mn_(1−x)Cr_xSiO₄/carbon composite nanofibers exhibit a high discharge capacity of 314 mA h g⁻¹ at the 5^th cycle and stable cycling performance.

Journal of Materials Chemistry

Cr-doped Li₂MnSiO₄/carbon composite nanofibers as high-energy cathodes for Li-ion batteries

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Cr-doped Li₂MnSiO₄/carbon composite nanofibers as high-energy cathodes for Li-ion batteries

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