Open AccessYolk–Shell P3‐Type K 0.5 [Mn 0.85 Ni 0.1 Co 0.05 ]O 2 : A Low‐Cost Cathode for Potassium‐Ion Batteries
Author(s) -
Hao Jiaxin,
Xiong Ke,
Zhou Jiang,
Rao Apparao M.,
Wang Xianyou,
Liu Huan,
Lu Bingan
Publication year - 2022
Publication title -
energy and environmental materials
Language(s) - English
Resource type - Journals
ISSN - 2575-0356
DOI - 10.1002/eem2.12161
Subject(s) - cathode , anode , materials science , battery (electricity) , graphite , chemical engineering , metallurgy , electrical engineering , electrode , chemistry , power (physics) , physics , quantum mechanics , engineering
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 K 0.5 [Mn 0.85 Ni 0.1 Co 0.05 ]O 2 (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.