Hierarchical porous carbon/selenium composite derived from hydrothermal treated peanut shell as high-performance lithium ion battery cathode
- 4 Downloads
Peanut shell-derived porous carbon has been prepared by the KOH-assisted hydrothermal treatment and subsequent carbonization route. The influences of KOH concentrations on structure of resulting carbon are clearly studied. At a KOH concentration of 5 M, the obtained porous carbon, possessing inner micropores and surface macropores, has a specific surface area of 827.7 m2/g and moderate porous size. The amorphous Se is uniformly encapsulated into its microporous structure to form hierarchical porous carbon/selenium composite. As the cathode material of Li ion battery, this composite delivers an initial discharge capacity of 590.6 mA h/g with Coulombic efficiency of 71.6% at 0.2 C, and a high capacity retention ratio of 83.3% can be reached after 500 cycles at 2 C. Even at a high rate of 4 C, this composite still presents a discharge capacity of 405.8 mA h/g. By comparison, these improved electrochemical performances may be attributed to the hierarchical porous feature, moderate porous size and effective encapsulation of selenium.
KeywordsHydrothermal assisted KOH solution Hierarchical porous carbon Carbon/Se composite Li–Se battery
The authors thank the financial supports from the Scientific Start Foundation of LongYan University (LB2014001), and from Natural Science Foundation of Fujian Province (2018J01502).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Lin J, Zeng CH, Lin XM, Reddy R, Niu JL, Liu JC, Cai YP (2019) Trimetallic MOF-derived Cu0.39Zn0.14Co2.47O4–CuO interwoven with carbon nanotubes on copper foam for superior lithium storage with boosted kinetics. ACS Sustain Chem Eng 7:15684–15695. https://doi.org/10.1021/acssuschemeng.9b03744 CrossRefGoogle Scholar
- Yu FQ, Li YL, Jia M, Zhang H, Shen Q (2017) Elaborate construction and electrochemical properties of lignin-derived macro-/micro-porous carbon-sulfur composites for rechargeable lithium–sulfur batteries: the effect of sulfur-loading time. J Alloys Compd 706:677–685. https://doi.org/10.1016/j.jallcom.2017.03.204 CrossRefGoogle Scholar