阴极
氧化还原
法拉第效率
过渡金属
离子
无机化学
电化学
价(化学)
氧化物
化学
材料科学
萃取(化学)
电压
分析化学(期刊)
电极
冶金
物理化学
物理
量子力学
生物化学
催化作用
色谱法
有机化学
作者
Yalan Liu,Dong Wang,Ping Li,Yihua Liu,Yan Sun,Yang Liu,Benhe Zhong,Zhenguo Wu,Xiaodong Guo
标识
DOI:10.1021/acs.iecr.2c01864
摘要
Low-cost P2-type Cu/Fe/Mn-based layered oxide is considered a promising cathode material of sodium ion batteries (SIBs) for large-scale application. However, the abnormal initial Coulombic efficiency (ICE) of a P2-type Cu/Fe/Mn-based cathode is always much higher than 100% due to the difference of Na+ extraction and insertion content in the first cycle, which becomes an obstacle to its commercialization. Herein, we reveal that increasing the charge capacity contribution of Mn3+/4+ from an open circuit voltage to a high cutoff voltage by adjusting the initial valence state of Mn ions can effectively solve this problem. The optimized P2-type Na0.85Cu0.1Fe0.25Mn0.65O2 cathode demonstrates a high energy density of 452 Wh kg–1 and an ICE of 100.9%. This work provides a regulated strategy for optimizing ICE in the Na-defective layered oxides cathode in SIBs.
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