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Sandwich‐Like Nanosheets of a N‐Doped Porous Carbon/Graphene Composite with Enhanced Electrochemical Properties for Lithium and Sodium Storage
Author(s) -
Qin Weiwei,
Teng Yongqiang,
Zhang Junke,
Xiao Xinfeng,
Li Yuan,
Li Zhenyu
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701214
Subject(s) - anode , materials science , graphene , composite number , lithium (medication) , carbonization , electrochemistry , chemical engineering , carbon fibers , electrode , nanotechnology , composite material , chemistry , medicine , scanning electron microscope , endocrinology , engineering
Energy storage systems, including lithium‐/sodium‐ion batteries (LIBs/SIBs), are important for being able to use renewable energies efficiently. The anode material is a vital link in the great industrialization chain. Herein, a sandwich‐like N‐doped porous carbon/graphene (N‐HCG) composite has been successfully achieved by using a facile and low‐temperature liquid‐phase method with melamine as the nitrogen source, followed by a carbonization process. The composite possesses a high specific surface area of 282.4 m 2 g −1 . As an anode in lithium‐ion batteries, N‐HCG delivers a capacity of 643 mAh g −1 at 100 mA g −1 , and a high capacity of 406 mAh g −1 is maintained even at 5 A g −1 after 2700 cycles. For sodium‐ion batteries, the obtained capacities of the N‐HCG electrodes are 208 mAh g −1 (100 mA g −1 for 120 cycles) and 145 mAh g −1 (1000 mA g −1 for 700 cycles). The excellent electrochemical performance including the rate capability and lifespan of N‐HCG can be attributed to the synergistic effects of the 2D sandwich‐like nanosheets with pores and extrinsic nitrogen doping. Thus, the as‐prepared N‐HCG composite is a highly promising anode material for LIB/SIB applications.