期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 27, 期 10, 页码 2239-2248出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(17)60250-4
关键词
cathode material; LiNi0.5Mn1.5O4; Na+ doping; electrochemical performance
资金
- Natural Science Foundation of Hebei Province, China [E2015202356]
- Technology Innovation Foundation for Outstanding Youth of Hebei University, China [2013009]
Pristine LiNi0.5Mn1.5O4 and Na-doped Li0.95Na0.05Ni0.5Mn1.5O4 cathode materials were synthesized by a simple solid-state method. The effects of Na+ doping on the crystalline structure and electrochemical performance of LiNi0.5Mn1.5O4 cathode material were systematically investigated. The samples were characterized by XRD, SEM, FT-IR, CV, EIS and galvanostatic charge/discharge tests. It is found that both pristine and Na-doped samples exhibit secondary agglomerates composed of well-defined octahedral primary particle, but Na+ doping decreases the primary particle size to certain extent. Na+ doping can effectively inhibit the formation of LixNi1-xO impurity phase, enhance the Ni/Mn disordering degree, decrease the charge-transfer resistance and accelerate the lithium ion diffusion, which are conductive to the rate capability. However, the doped Na+ ions tend to occupy 8a Li sites, which forces equal amounts of Li+ ions to occupy 16d octahedral sites, making the spinel framework less stable, therefore the cycling stability is not improved obviously after Na+ doping.
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