期刊
CHEMICAL ENGINEERING JOURNAL
卷 380, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122457
关键词
N, O, P-codoped; Three-dimensional porous carbon; Anode; Sodium ion batteries; Surface-dominated
资金
- National Natural Science Foundation of China [51672021, U1610252]
Porous carbon (PC) materials are the excellent alternative to anodes of high performance sodium ion batteries (SIBs). However, most PC materials are prepared with complicated and multi-step template method, which limits the mass production. Herein, we present a simple and repeatable calcination approach to synthesize three-dimensional porous carbon (3D-PC) materials using poly(p-phenylenediamine) hydrogel as precursor. N, O and P heteroatoms are successfully introduced into 3D-PC to provide more sodium storage sites. The obtained 3D-PC delivers high sodium storage capacity of 332 mAh g(-1) at 50 mA g(-1) and the reversible capacity still retains 139 mAh g(-1) at 10 A g(-1). Moreover, 3D-PC also shows ultralong cycling life, the stable capacities of 212 mAh g(-1) and 120 mAh g(-1) after 1000 cycles even at the high current density of 0.5 A g(-1) and 5 A g(-1), respectively. These results illustrate that 3D-PC electrode displays great rate capability and excellent cycling stability, which would be ascribed to surface-dominated sodium storage mechanism according to quantitative analysis. This method is low cost and effective for preparing high-performance porous carbon anodes for SIBs.
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