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11. Advanced K3V2(PO4)2O2F cathode for rechargeable potassium-ion batteries with high energy density.

Author

Gu, Zhen-Yi, Wang, Xiao-Tong, Zhao, Xin-Xin, Cao, Jun-Ming, Heng, Yong-Li, Zheng, Shuo-Hang, Liu, Yan, Guo, Jin-Zhi, Wang, Si-Ze, and Wu, Xing-Long

Subjects
ENERGY density, CATHODES, STORAGE batteries, PHASE transitions, X-ray diffraction
Abstract

Potassium-ion batteries (PIBs) have emerged as promising candidates for cost-effective and sustainable energy-storage systems. Nevertheless, limited by the large K+ radius, PIBs have great difficulty in figuring out and designing suitable host materials. Herein, a suitable cathode material K3V2(PO4)2O2F (KVPOF) for PIBs has been carefully prepared. It exhibits a high specific capacity close to the theoretical value, 116.3 mAh/g at 20 mA/g within the voltage window of 2.0–4.5 V vs K+/K, corresponding to a de-/intercalation process of ∼2 mol K+ per formula unit. In addition, it presents an average operating voltage plateau of about 3.5 V, resulting in an energy density of about 410 Wh/kg. The crystal structure and phase transition are revealed by in situ x-ray diffraction, and the structure is found to be fully reversible during the de-/intercalation of K+. Furthermore, the potential of KVPOF cathode for applications at low temperatures was explored, and the full cell matched with graphite anode demonstrated fair electrochemical performance. The experimental results suggest the feasibility of using KVPOF as cathode material for rechargeable PIBs. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Hollow Na0.62K0.05Mn0.7Ni0.2Co0.1O2polyhedra with exposed stable {001} facets and K riveting for sodium-ion batteries

Author

Huang, Zhi-Xiong, Zhang, Xue-Li, Zhao, Xin-Xin, Heng, Yong-Li, Wang, Ting, Geng, Hongbo, and Wu, Xing-Long

Abstract

Recently, there has been an increased interest in sodium-ion batteries (SIBs), in which cathodes that directly determine the performance of batteries play a critical role. Among the cathode materials, layered oxide cathodes are the most fascinating electrode materials for SIBs. However, irreversible phase transition, low capacity, poor air stability, and inferior cycling stability limit the application of layered oxides. In this study, hollow P2-Na0.62K0.05Mn0.7Ni0.2Co0.1O2polyhedra consisting of nanosheets with exposed stable {001} facets and a small amount of large-size K+ions partly replacing Na+ions were successfully obtained. By virtue of the high redox potential of Ni2+/4+, it can be stored in air for several days. It also exhibits a high discharge capacity of 115.0 mA h g−1after 100 cycles at 100 mA g−1. A preeminent discharge capacity of 104.1 mA h g−1can be achieved even at 500 mA g−1. Results showed that such performances are related to the block of phase transition from P2 to O2 and to the riveting of K+ions, which expands the interlayer space (d(O—Na—O)) and accelerates the transfer of sodium. Thus, the P2-Na0.62K0.05Mn0.7Ni0.2Co0.1O2cathode is one of the promising cathode materials for SIBs.

Published
2022
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