材料科学
碳化
阳极
化学工程
法拉第效率
纳米晶
碳纤维
电化学
介孔材料
多孔性
电极
复合材料
复合数
纳米技术
有机化学
催化作用
化学
工程类
物理化学
扫描电子显微镜
作者
Kaimeng Xu,Guanben Du,Tuhua Zhong,Dengjiao Chen,Xu Lin,Dechao Wang,Siqun Wang
标识
DOI:10.1016/j.jtice.2020.02.005
摘要
Green sustainable nitrogen self-doped porous carbon anode material for the use in lithium ion batteries was successfully obtained from chitosan (CS) / cellulose nanocrystal (CNC) biocomposites by facile one step casting-carbonization process. Three main factors–the carbonization temperature, the interfacial compatibility, and the N-doping content—synergistically affected the electrochemical performance of the CS/CNC porous carbon anode. High N-doping content and moderate interfacial compatibility between CS and CNC played a more crucial role in samples' electrochemical performance at the low temperature (800°C) and at the high temperature (1500°C), respectively. The pyrolyzed carbon tended toward stability after the temperature reached 1200°C, corresponding to the more stable cycling performance and higher Coulombic efficiency of the electrodes. Incorporation of CNC effectively promoted the rate retention and cycling stability. The CS/CNC-1200-10 electrode with moderate interfacial bonding, relatively high specific surface area, C/N ratio as well as the reasonable multiscale pore distribution including abundant micropores and a few mesopores and macropores showed a good average specific capacity (333 mAh g−1) at 100 mA g−1, retention capacity (251 mAh g−1) at 2000 mA g−1, as well as an excellent cycling stability (327 mAh g−1) after 50 cycles.
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