微尺度化学
材料科学
阴极
复合数
化学工程
离子
纳米尺度
储能
结构稳定性
扩散
壳体(结构)
钠
氧化物
纳米技术
复合材料
热力学
物理化学
冶金
化学
工程类
数学教育
物理
功率(物理)
有机化学
结构工程
数学
作者
Cheng Chen,Zhen Han,Shuangqiang Chen,Shuo Qi,Xinyue Lan,Chunchen Zhang,Lin Chen,Peng Wang,Weifeng Wei
标识
DOI:10.1021/acsami.9b19260
摘要
Sodium layered oxides are considered to be cathode candidates with the most potential for large-scale energy storage because of their high reversible capacity and wide availability of sodium resources. A significant hurdle to wide application of these layered oxides lies in simultaneously satisfying high-energy density and long cycle life because of the intrinsic problems associated with their structural irreversibility. Herein, a O3/O'3-P2 core-shell composite that integrates a high specific capacity from O-type Ni-based core and good structural stability from P2-type Mn-rich shell is presented. Multiscale electron microscopy and affiliated spectroscopy analyses reveal that, in addition to the microscale O3/O'3-P2 core-shell structure, a nanoscale coherent P2/O3 intergrown structure can also be identified in the composite. Such well-tailored structures not only constrain the structural damages (microscale cracks) induced by repeated volumetric changes upon desodiation and resodiation but also facilitate fast Na ions diffusion through the exterior P2-type layered structure. This work may provide new clues into the design of high-performance cathode materials for sodium-ion batteries.
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