Fabrication of CNTs/MnO2 composite as a wrapping layer for surface modification of Cr-doped LiNi0.5Mn1.5O4 for lithium ion batteries

Needle-like MnO2 is deposited on the surface of CNTs using a simple redox reaction and simultaneously forms a special wrapping layer on the surface and among the particles of Cr-doped LiNi0.5Mn1.5O4 through an auto-grow process. The CNTs act as a conductive network of electrons and the needle-like M...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (91), p.88719-88726
Main Authors: Zhang, Yu-Hang, Zhao, Qin, Cong, Li-Na, Bao, Sheng-Da, Xie, Hai-Ming, Sun, Li-Qun
Format: Article
Language:English
Subjects:
Contact
Electrodes
Electrolytes
High voltages
Lithium-ion batteries
Particulate composites
Rechargeable batteries
Wrapping
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Summary:Needle-like MnO2 is deposited on the surface of CNTs using a simple redox reaction and simultaneously forms a special wrapping layer on the surface and among the particles of Cr-doped LiNi0.5Mn1.5O4 through an auto-grow process. The CNTs act as a conductive network of electrons and the needle-like MnO2 increases the contact points among the particles and furthermore provides additional Li+ diffusion paths. The CNTs/MnO2 composite is also a protective layer to suppress the side reaction between the electrode and the electrolyte. The CNTs/MnO2-coated, Cr-doped LiNi0.5Mn1.5O4 (CNTs/MnO2-Cr-LNMO) shows superior electrochemical properties, with a high specific capacity and excellent cycling stability at high voltage and high rate.
ISSN:2046-2069
DOI:10.1039/c6ra18764a