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 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Grant No. 52074113, 22005091), the Hunan University Outstanding Youth Science Foundation (Grant No. 531118040319), The science and technology innovation Program of Hunan Province (Grant No. 2021RC3055), the CITIC Metals Ningbo Energy Co. Ltd. (No. H202191380246), the Chongqing Talents: Exceptional Young Talents Project (Grant No. CQYC202105015), the Shenzhen Virtual University Park Basic Research Project of Free exploration (Grant No. 2021Szvup036).
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.
KW - Bimetallic-sulfide
KW - Intercalation/deintercalation mechanism
KW - Potassium-ion batteries
KW - Reversible capacity
KW - Voltage engineering
UR - http://www.scopus.com/inward/record.url?scp=85158814903&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85158814903&partnerID=8YFLogxK
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 -