标题：MoSe2-Covered N,P-Doped Carbon Nanosheets as a Long-Life and High-Rate Anode Material for Sodium-Ion Batteries
作者：Niu, Feier ;Yang, Jing ;Wang, Nana ;Zhang, Dapeng ;Fan, Weiliu ;Yang, Jian ;Qian, Yitai
作者机构：[Niu, Feier ;Yang, Jing ;Zhang, Dapeng ;Fan, Weiliu ;Yang, Jian ;Qian, Yitai ] Key Laboratory of Colloid and Interface Chemistry, Ministry of Educatio 更多
来源：Advanced Functional Materials
摘要：MoSe2grown on N,P-co-doped carbon nanosheets is synthesized by a solvothermal reaction followed with a high-temperature calcination. This composite has an interlayer spacing of MoSe2expanded to facilitate sodium-ion diffusion, MoSe2immobilized on carbon nanosheets to improve charge-transfer kinetics, and N and P incorporated into carbon to enhance its interaction with active species upon cycling. These features greatly improve the electrochemical performance of this composite, as compared to all the controls. It presents a specific capacity of 378 mAh g−1after 1000 cycles at 0.5 A g−1, corresponding to 87% of the capacity at the second cycle. Ex situ Raman spectra and high-resolution transmission electron microscopy images confirm that it is element Se, rather than MoSe2, formed after the charging process. The interaction of the active species with modified carbon is simulated using density functional theory to explain this excellent stability. The superior rate capability, where the capacity at 15 A g−1equals ≈55% of that at 0.5 A g−1, could be associated with the significant contribution of pseudocapacitance. By pairing with homemade Na3V2(PO4)3/C, this composite also exhibits excellent performances in full cells.
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