自行车
材料科学
阴极
离子
钠
化学
冶金
电气工程
工程类
历史
考古
有机化学
作者
Jun Xiao,Yang Xiao,Shijian Wang,Zefu Huang,Jiayi Li,Cheng Gong,Gui-Lai Zhang,Bing Sun,Hong Gao,Huiqiao Li,Xin Guo,Yong Wang,Hao Liu,Guoxiu Wang
标识
DOI:10.1016/j.jechem.2024.06.007
摘要
The widespread interest in layered P2-type Mn-based cathode materials for sodium-ion batteries (SIBs) stems from their cost-effectiveness and abundant resources. However, the inferior cycle stability and mediocre rate performance impede their further development in practical applications. Herein, we devised a wet chemical precipitation method to deposit an amorphous aluminum phosphate (AlPO4, denoted as AP) protective layer onto the surface of P2-type Na0.55Ni0.1Co0.1Mn0.8O2 (NCM@AP). The resulting NCM@5AP electrode, with a 5 wt% coating, exhibits extended cycle life (capacity retention of 78.4% after 200 cycles at 100 mA g−1) and superior rate performance (98 mA h g−1 at 500 mA g−1) compared to pristine NCM. Moreover, our investigation provides comprehensive insights into the phase stability and active Na+ ion kinetics in the NCM@5AP composite electrode, shedding light on the underlying mechanisms responsible for the enhanced performance observed in the coated electrode.
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