Construction nasicon-type NaTi2(PO4)3 nanoshell on the surface of P2-type Na0 .67Co0.2Mn0.8O2 cathode for superior room/low-temperature sodium storage
Construction nasicon-type NaTi2(PO4)3 nanoshell on the surface of P2-type Na0 .67Co0.2Mn0.8O2 cathode for superior room/low-temperature sodium storage
复制标题
在P2型Na0.67Co0.2Mn0.8O2阴极表面构建nasicon型NaTi2(PO4)3纳米壳，实现优异的室温/低温钠存储
DOI：
10.1016/j.cej.2020.126181
复制
发表时间：
2020-12-15
影响因子：
15.1
通讯作者：
Zhang, Jiujun
中科院分区：
文献类型：
--
作者：
Li, Yong;Shi, Qinhao;Zhang, Jiujun
P2-type manganese-based layered oxides are considered as promising cathode materials for sodium-ion batteries (SIBs). However, most of them suffer from sluggish kinetics and unfavorable structural stability, severely impeding their practical applications. Herein, Nasicon-type NaTi2(PO4)(3) (NTP) nanoshell is coated on the surface of P2-type Na0 .67Co0.2Mn0.8O2 (NCM) to boost its performance as a novel cathode for SIBs. The as-prepared NCM@NTP7 exhibits smooth electrochemical charge/discharge profiles, with a specific capacity of 70.7 mAh/g at 20C, and 86.7% capacity retained at 0.5C after 150 cycles at room temperature. Impressively, the bulk structure can be stabilized via the absolute solid-solution reaction at low temperature (-20 degrees C), which shows 120.9 mAh/g discharge capacity at 0.2C with 92.3% retention and fast Na+ transport kinetic, wherein the D value is 16 times as large as that of pristine NCM. Our study provides a simple and efficient strategy to design and optimize promising layer-structural cathodes for SIBs.
