碳化
阳极
石墨氮化碳
材料科学
化学工程
插层(化学)
碳纤维
石墨
高原(数学)
蚀刻(微加工)
纳米技术
复合数
化学
复合材料
无机化学
催化作用
电极
有机化学
图层(电子)
物理化学
扫描电子显微镜
数学分析
数学
光催化
工程类
作者
Zhaohua Zhang,Guangxu Huang,Xiaoxiao Qu,Kun Wang,Yong Li,Jianbo Jia,Baolin Xing,Chuanxiang Zhang
标识
DOI:10.1016/j.cej.2023.147188
摘要
The practical application of sodium-ion batteries is mainly hindered by relatively low energy density, which can be effectively overcome by increasing the pseudo-graphitic content in non-graphitic carbon (NGC) anodes. Herein, a simple and efficient strategy was reported to promote the growth of pseudo-graphitic domains in NGC thanks to the synergistic effect of pre-carbonization and NaOH etching using semi-coke as precursor. Based on pre-carbonization at 800 °C and NaOH etching with NaOH/carbon ratio of 0.5 at 600 °C, the resultant NGC (FC-800–0.5–600) exhibits a 13 % increase in percentage of pseudo-graphitic structure meanwhile 14 % decrease for graphite-like structure, but similar content of highly disordered structure compared with its counterpart. Notably, although similar in sloping capacity, FC-800–0.5–600 possesses much higher plateau capacity (<0.1 V) of 218.6 mAh g−1 than its counterpart (174.9 mAh g−1), which is attributed to the enhanced “interlayer intercalation” effect related with pseudo-graphitic structure. Thus, FC-800–0.5–600 can deliver an impressive reversible capacity of 326.8 mAh g−1 at 20 mA g−1, together with a considerable ICE of 84.7 %. This work proposed an effective strategy to increase pseudo-graphitic structure content in NGC, providing a rational guide for designing high-performance anodes in SIBs for practical use.
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