Core-Shell Layered Oxide Cathode for High-Performance Sodium-Ion Batteries

被引:74
作者
Chen, Cheng [3 ]
Han, Zhen [1 ,2 ]
Chen, Shuangqiang [4 ]
Qi, Shuo [4 ]
Lan, Xinyue [3 ]
Zhang, Chunchen [1 ,2 ]
Chen, Lin [3 ]
Wang, Peng [1 ,2 ]
Wei, Weifeng [3 ]
机构
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Coll Engn & Appl Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
[4] Shanghai Univ, Sch Environm & Chem Engn, Dept Chem Engn, Shanghai 200444, Peoples R China
基金
中国国家自然科学基金;
关键词
sodium-ion batteries; nickel-based layered oxides; core-shell; phase transition; cathode materials; PHASE-TRANSITION; DIFFUSION; ELECTRODE; LITHIUM; STABILITY; INSIGHTS; P2-TYPE; VOLTAGE;
D O I
10.1021/acsami.9b19260
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
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.
引用
收藏
页码:7144 / 7152
页数:9
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