TY - JOUR
T1 - Enhanced potassium-ion storage performance of bimetallic-sulfide based on regulatory reaction mechanism
AU - Li, Shengyang
AU - Chen, Hao
AU - Zhang, Qiusheng
AU - Deng, Hongli
AU - Chen, Song
AU - Shen, Xiaohua
AU - Yuan, Yizhi
AU - Ding, Yifang
AU - Cheng, Yingliang
AU - Sun, Hongtao
AU - Zhu, Jian
AU - Lu, Bingan
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/6/15
Y1 - 2023/6/15
N2 - Developing advanced materials for reversibly accommodating K+ and understanding their electrochemical mechanism is essential for K+ storage. Herein, we report a bimetallic-sulfide with a hollow nanopyramid structure wrapped by reduced graphene oxide as an anode (NiCo1.15S4@rGO) for potassium ion batteries (PIBs). It is revealed that the NiCo1.15S4@rGO with octahedral sites can ensure reversible intercalation/deintercalation of K+. The irreversible phase transformation produces “death substances” during the potassium storage, leading to severe capacity degradation. In the regulated voltage window of 0.25–2.5 V, the NiCo1.15S4@rGO exhibited an intercalation/deintercalation reaction mechanism without irreversible phase transformation, which delivered a high reversible capacity of 436 mAh g−1 at 0.5 A g−1 and excellent rate properties (315 mAh g−1 at 1.5 A g−1). The corresponding reaction mechanisms and morphological evolution were further revealed by in-situ powder X-ray diffraction (XRD), in-situ electrochemical impedance spectroscopy (EIS), and ex-situ characterizations. An in-depth understanding of bimetallic sulfide anodes for advanced PIBs may provide decisive guidance for the design of high-performance anodes.
AB - Developing advanced materials for reversibly accommodating K+ and understanding their electrochemical mechanism is essential for K+ storage. Herein, we report a bimetallic-sulfide with a hollow nanopyramid structure wrapped by reduced graphene oxide as an anode (NiCo1.15S4@rGO) for potassium ion batteries (PIBs). It is revealed that the NiCo1.15S4@rGO with octahedral sites can ensure reversible intercalation/deintercalation of K+. The irreversible phase transformation produces “death substances” during the potassium storage, leading to severe capacity degradation. In the regulated voltage window of 0.25–2.5 V, the NiCo1.15S4@rGO exhibited an intercalation/deintercalation reaction mechanism without irreversible phase transformation, which delivered a high reversible capacity of 436 mAh g−1 at 0.5 A g−1 and excellent rate properties (315 mAh g−1 at 1.5 A g−1). The corresponding reaction mechanisms and morphological evolution were further revealed by in-situ powder X-ray diffraction (XRD), in-situ electrochemical impedance spectroscopy (EIS), and ex-situ characterizations. An in-depth understanding of bimetallic sulfide anodes for advanced PIBs may provide decisive guidance for the design of high-performance anodes.
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U2 - 10.1016/j.cej.2023.143342
DO - 10.1016/j.cej.2023.143342
M3 - Article
AN - SCOPUS:85158814903
SN - 1385-8947
VL - 466
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 143342
ER -