NiS2/CoS2@NC@C nanocubes derived from prussian blue analogues as an advanced anode with extraordinary long-cycle performance for sodium ion batteries

普鲁士蓝 材料科学 阳极 电化学 化学工程 碳纤维 碳化 纳米技术 电极 化学 复合材料 扫描电子显微镜 物理化学 复合数 工程类
作者
Ransha Deng,Peng Wang,Yuxiang Chen,Qiaoji Zheng,Dunmin Lin
出处
期刊:Electrochimica Acta [Elsevier BV]
卷期号:469: 143245-143245 被引量:6
标识
DOI:10.1016/j.electacta.2023.143245
摘要

Transition metal sulfides (TMSs) are regarded as one of the ideal anodes for sodium ion batteries (SIBs) owing to their high theoretical capacity and strong electrochemical activity; nonetheless, it still faces challenges such as large volume variation and low conductivity during chemical reactions for applications. Herein, the nanocubes of carbon-encapsulated NiS2/CoS2 embedded porous nitrogen-doped carbon matrixes (NiS2/CoS2@NC@C) are synthesized as a high-performance anode by in-situ carbonizing and subsequently sulphurating the resorcinol-formaldehyde (RF)-coated Ni-Co-based Prussian blue analogues (PBAs). The RF-derived carbon shell acts as a rigid skeleton to effectively relieve the bulk stress during charging and discharging for ensuring the structure integrity, while the porous nitrogen-doped carbon matrix improves the electronic conductivity, presents rich channels for ion/electron transfer and inhibits the agglomeration of active material during chemical reaction. In addition, the lattice distortion at the heterogeneous interface of the NiS2/CoS2 allows the redistribution of electrons, promoting the chemical reaction kinetics. Consequently, the NiS2/CoS2@NC@C nanocubes exhibit excellent electrochemical properties: a high discharge capacity of 489.9 mA h g−1 after 170 cycles at 1.0 A g−1 (920.6/807.9 mA h g−1 for the initial discharge/charge capacity with the initial coulomb efficiency of 87.7%) and a discharge capacity of 349.7 mA h g−1 with the CE close to 100.0% at 5.0 A g−1 even after 2000 cycles. This study proposes a viable approach for the effective construction of advanced anodes with unique micromorphology and chemical composition based on bimetallic PBAs for SIBs.
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