期刊
NANO ENERGY
卷 59, 期 -, 页码 184-196出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.02.040
关键词
Li-rich layered oxides; Hollow structure; Hybrid coatings; Oxygen vacancies; High rate performance
类别
资金
- National Key R&D Program of China [2016YFA0202602]
- National Natural Science Foundation of China [51571167, 51701169, 51871188]
- Natural Science Foundation of Fujian Province of China [2017J05087]
- Key Projects of Youth Natural Foundation for the Universities of Fujian Province of China [JZ160397]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
Li-rich layered oxides (LRLO) with high specific capacity over 250 mA h g(-1) are attractive cathode material candidates for the next-generation high performance lithium-ion batteries. However, LRLO always suffers from low initial Coulombic efficiency, poor cycling and rate properties. Herein, unique double-shell LRLO hollow microspheres with sandwich-like carbon@spinel@layered@spinel@carbon shells (LRLO-500@S@C) were successfully synthesized via a facile template-free method, followed by carbothermal reduction treatment. The fabricated LRLO-500@S@C cathode delivers a high initial charge capacity of 312.5 mA h g(-1 )with a large initial Coulombic efficiency of 89.7%. After cycling 200 times, large and stable discharge capacities of 228.3 mA h g(-1) and 196.1 mA h g(-1) can be obtained at 1.0 C and 5.0 C, respectively. Moreover, coin-type full cell with LRLO-500@S@C as cathode and Li(4)Ti(5)O(12 )as anode delivers outstanding lithium storage properties. The impressive electrochemical performances of LRLO-500@S@C cathode material can be attributed to its multiscale co-ordinated design based on hierarchical double-shell hollow construction, the special layered@spinel@carbon heterostructured shells and the introduced oxygen vacancies, which benefit to shorten Li-ion diffusion paths, strengthen structural stability and reduce side reactions.
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