Hierarchical Co3O4@N-Doped Carbon Composite as an Advanced Anode Material for Ultrastable Potassium Storage
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Chen, Hao
Hoh, Hui Ying
Gould, Tim
Balogun, M-Sadeeq Jie Tang
Lai, Chao
Zhao, Huijun
Zhang, Shanqing
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Abstract
Cobalt oxide (Co3O4) delivers a poor capacity when applied in large-sized alkali metal-ion systems such as potassium-ion batteries (KIBs). Our density functional theory calculation suggests that this is due to poor conductivity, high diffusion barrier, and weak potassium interaction. N-doped carbon can effectively attract potassium ions, improve conductivity, and reduce diffusion barriers. Through interface engineering, the properties of Co3O4 can be tuned via composite design. Herein, a Co3O4@N-doped carbon composite was designed as an advanced anode for KIBs. Due to the interfacial design of the composite, K+ were effectively transported through the Co3O4@N-C composite via multiple ionic pathways. The structural design of the composite facilitated increased Co3O4 spacing, a nitrogen-doped carbon layer reduced K-ion diffusion barrier, and improved conductivity and protected the electrode from damage. Based on the entire composite, a superior capacity of 448.7 mAh/g was delivered at 50 mA/g after 40 cycles, and moreover, 213 mAh/g was retained after 740 cycles when cycled at 500 mA/g. This performance exceeds that of most metal-oxide-based KIB anodes reported in literature.
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ACS Nano
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14
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4
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Chemical sciences
Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry, Physical
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Adekoya, D; Chen, H; Hoh, HY; Gould, T; Balogun, M-SJT; Lai, C; Zhao, H; Zhang, S, Hierarchical Co3O4@N-Doped Carbon Composite as an Advanced Anode Material for Ultrastable Potassium Storage, ACS Nano, 2020, 14 (4), pp. 5027-5035