Liu, Liying; Tinker, Henry R; Wu, Yusheng; Lv, Jiaqi; Li, Laishi; Fang, Yingjiao; Wu, Yuhan; Liu, Liying; Tinker, Henry R; Wu, Yusheng; Lv, Jiaqi; Li, Laishi; Fang, Yingjiao; Wu, Yuhan; Xu, Yang; - view fewer (2024) Hard carbon derived from Physalis alkekengi L. husks as a stable anode for sodium-ion batteries. Molecular Systems Design & Engineering 10.1039/d4me00007b. (In press).

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Abstract

Hard carbon is one of the most promising anode materials for sodium-ion batteries (SIBs). Biomass-derived hard carbon is deemed to be a good choice because of its superior material properties, abundance source, and cost advantages. This work used Physalis alkekengi L.'s husks as precursors to prepare a series of hard carbon materials via a pyrolysis method. It was found that the carbonization temperature is closely linked to the lattice characteristics of PLH-derived hard carbon. Higher temperatures promote the degree of graphitization of the lattice, which produces a smaller carbon interlayer spacing. The optimal sample demonstrated a high electrochemical performance and good reaction kinetics. It maintained a capacity of 291.6 mA h g−1 after 100 cycles at 0.1 A g−1 and delivered an average capacity of 61.9 mA h g−1 at a high rate of 2.0 A g−1. Furthermore, a full cell assembled using the optimal sample as an anode and Na3V2(PO4)3 as a cathode gave a high reversible capacity of 161.9 mA h g−1 at 0.1 A g−1 after 100 cycles.

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