Low-cost preparation methods for cathodes with high capacity and long cycle life are crucial for commercializing potassium-ion batteries(PIBs).Presently,the charging/discharging strain that develops in the active cathode material of PIBs causes cracks in the particles,leading to a sharp capacity fade.Here,to abate the strain release and the need for an industrially relevant process,a simple low-cost co-precipitation method for synthesizing yolk-shell P3-type K0.5[Mn0.85Ni0.1Co0.05]O2(YS-KMNC)was reported.As cathode material for PIBs,the YS-KMNC delivers a high reversible capacity(96 mAh g-1 at 20 mA g-1)and excellent cycle stability(80.5％retention over 400 cycles at a high current density of 200 mA g-1).More importantly,a full battery assembled with the YS-KMNC cathode and a commercial graphite anode exhibits a high operating voltage(0.5-3.4 V)and an excellent cycling performance(84.2％retention for 100 cycles at 100 mA g-1).Considering the low-cost,simple production process and high performance of YS-KMNC cathode,this work could pave the way for the commercial development of PIBs.

Jiaxin Hao;Ke Xiong;Jiang Zhou;Apparao M.Rao;Xianyou Wang;Huan Liu;Bingan Lu

School of Physics and Electronics,State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education,Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion,School of Chemistry,Xiangtan University,Xiangtan 411105,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;Department of Physics and Astronomy,Clemson Nanomaterials Institute,Clemson University,Clemson SC 29634,USA;College of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Fujian Strait Research Institute of Industrial Graphene Technologies,Quanzhou 362000,China

能源与环境材料（英文）

[1]Jiaxin Hao;Ke Xiong;Jiang Zhou;Apparao M.Rao;Xianyou Wang;Huan Liu;Bingan Lu-.Yolk-Shell P3-Type K0.5[Mn0.85Ni0.1Co0.05]O2:A Low-Cost Cathode for Potassium-Ion Batteries)[J].能源与环境材料（英文）,2022(01):261-269

85Ni0,KMNC

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