Supramolecular self-assembly synthesis of hemoglobin-like amorphous CoP@N, P-doped carbon composites enable ultralong stable cycling under high-current density for lithium-ion battery anodes

Qin Mu, Ruilin Liu, Hideo Kimura, Jincheng Li, Huiyu Jiang, Xiaoyu Zhang, Zhipeng Yu*, Xueqin Sun, Hassan Algadi, Zhanhu Guo, Wei Du, Chuanxin Hou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cobalt phosphide (CoP) has been emerging as alternative lithium-ion batteries (LIBs) anode in view of the outstanding thermodynamic stability and high theoretical capacity. However, the lithium storage behaviors were impeded by poor cycling and rate performance induced by huge volumetric changes of CoP anodes during Li+ intercalation/deintercalation and the poor reaction kinetics caused by low electronic conductivity. Herein, the uniquely designed hemoglobin-like composites consisting of CoP nanoparticles coated by N, P-doped carbon shell (CoP@PNC) were prepared via a supramolecular self-assembly method, followed by the facile heat treatment process, which presented the amorphous phase. Based on the synergistic effects of rational nano/microstructure, double heterogeneous elements doped carbon substrate and amorphous phase, the transport paths of Li+ and e were shortened, the electronic conductivity was enhanced, the volumetric changes were effectively alleviated, resulting in outstanding electrochemical performance when applied as anode electrodes. The CoP@PNC electrodes deliver a capacity of 806.8 mAh g−1 after 100 cycles at 0.1 A g−1 and 523.9 mAh g−1 after 3000 cycles at 2.0 A g−1. Furthermore, pseudo-capacitance behavior dominates the storage mechanism of CoP@PNC electrodes based on the quantitative kinetic analysis result that a high ratio of 66% in total capacity at 0.5 mV−1. This work illuminates the route to effectively relieve the huge volumetric changes to improve the electrochemical performance of transition metal phosphide and promote their practical application steps as electrodes for high energy density batteries.

Original languageEnglish
Article number23
Number of pages11
JournalAdvanced Composites and Hybrid Materials
Volume6
Issue number1
Early online date26 Dec 2022
DOIs
Publication statusE-pub ahead of print - 26 Dec 2022

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