期刊
ELECTROCHIMICA ACTA
卷 155, 期 -, 页码 174-182出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.12.108
关键词
Lithium ion batteries; Sodium ion batteries; Nitrogen doping; Double-shelled; Hollow carbon spheres
资金
- 973 Project of China [2011CB935901]
- National Natural Science Fund of China [91022033, 21201158]
Nitrogen-doped porous interconnected double-shelled hollow carbon spheres (N-DHCSs) have been synthesized by chemical treatment of Fe3O4@C precursors using HNO3 at low temperature. When the precursors are disposed with HCl or H2SO4, uniform porous interconnected double-shelled hollow carbon spheres (DHCSs) are prepared. Comparing with DHCSs, the as-prepared N-DHCSs show higher Li-storage capacity and both show good cycling stability as anode materials in lithium ion batteries. The N-DHCSs offer a capacity of 512 mA h g (1) at 1.5 C after 500 cycles and their porous interconnected double-shelled hollow structure could be well kept. The N-DHCSs also show high reversible capacity of 598 mA h g (1) at 1 C after cycled at different current densities. In addition, the N-DHCSs as anode materials in sodium half-cell exhibit high reversible capacity of 120 mA h g (1) at a current rate of 0.2 A g (1) after 100 cycles. (C) 2015 Published by Elsevier Ltd.
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