Layered P 2-Type K 0 . 65 Fe 0 . 5 Mn 0 . 5 O 2 Microspheres as Superior Cathode for High-Energy Potassium-Ion Batteries

Content Provider	Semantic Scholar
Author	Deng, Tao Fan, Xiulin Chen, Ji Chen, Long Luo, Chao Zhou, Xiuquan Yang, Junhe Zheng, Shiyou Wang, Chunsheng
Copyright Year	2018
Abstract	Potassium-ion batteries have been regarded as the potential alternatives to lithium-ion batteries (LIBs) due to the low cost, earth abundance, and low potential of K (−2.936 vs standard hydrogen electrode (SHE)). However, the lack of low-cost cathodes with high energy density and long cycle life always limits its application. In this work, high-energy layered P2-type hierarchical K0.65Fe0.5Mn0.5O2 (P2-KFMO) microspheres, assembled by the primary nanoparticles, are fabricated via a modified solvent-thermal method. Benefiting from the unique microspheres with primary nanoparticles, the K+ intercalation/deintercalation kinetics of P2-KFMO is greatly enhanced with a stabilized cathodic electrolyte interphase on the cathode. The P2-KFMO microsphere presents a highly reversible potassium storage capacity of 151 mAh g−1 at 20 mA g−1, fast rate capability of 103 mAh g−1 at 100 mA g−1, and long cycling stability with 78% capacity retention after 350 cycles. A full cell with P2-KFMO microspheres as cathode and hard carbon as anode is constructed, which exhibits long-term cycling stability (>80% of retention after 100 cycles). The present high-performance P2-KFMO microsphere cathode synthesized using earth-abundant elements provides a new cost-effective alternative to LIBs for large-scale energy storage.
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Language	English
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Content Type	Text
Resource Type	Article