Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767172 | Electrochimica Acta | 2017 | 25 Pages |
Abstract
To meet the requirements of the energy storage materials for high energy density and high power density, unique niobium carbide-derived carbon (NbC-CDC) coated graphitized mesophase carbon microbead (GMCMB) composites (GMCMB@NbC-CDC) with core-shell structure were prepared by chlorinating the precursor of graphitization mesophase carbon microbead@niobium carbide. The microstructure of NbC-CDC was characterized as mainly amorphous carbon combined with short and curved sheets of graphene, and the order degree of carbon layers increases with the chlorination temperature. The composites exhibited a tunable specific surface area and micropore volume, with micropore size of 0.6â¼0.7 nm. Compared with the pure GMCMB, the GMCMB@NbC-CDC composites manifested higher charge (726.9 mAh gâ1) and discharge capacities (458.9 mAh gâ1) at the first cycle, which was probably that Li ions could insert into not only carbon layers of GMCMB but also micropores of NbC-CDC. After 100 cycles, the discharge capacity of GMCMB@NbC-CDC chlorinated at 800 °C still kept 384.6 mAh gâ1, which was much higher than that of the pure GMCMB (305.2 mAh gâ1). Furthermore, the GMCMB@NbC-CDC composites presented better rate performance at higher current densities.
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Authors
Xiulan Yuan, Ye Cong, Yanyan Yu, Xuanke Li, Jiang Zhang, Zhijun Dong, Guanming Yuan, Zhengwei Cui, Yanjun Li,