Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 774, Issue -, Pages 82-92Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.09.281
Keywords
Ni-rich cathode; Yttrium modification; LiY0(2); Gradient doping; High voltage
Categories
Funding
- National Natural Science Foundation of China [21071026]
- Outstanding Talent Introduction Project of Henan Institute of Science and Technology [203010617011]
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This work adopts an effective method to stabilize the structure of Ni-rich LiNi0.8Co0.1 Mn0.1O2 with yttrium modifying. The results of XRD, EDS, HR-TEM and XPS tests verify that the yttrium modified materials integrate surface nanoscale LiYO2 coating and inner gradient Y3+ doping. TGA and DSC tests confirm that yttrium modification can promote the thermal stability of LiNi0.8Co0.1Mn0.1O2 cathode material. The results of galvanostatic charge-discharge tests suggest that the 2 mol% yttrium modified sample can exhibit a superior cycling performance with initial discharge capacity of 189.4 mAh g(-1) and outstanding capacity retention of 98.4% after 100 cycles at 2.8-4.5 V, which presents obvious enhancement compared with the 83.5% capacity retention of pristine sample. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests indicate that 2 mol % yttrium modifying significantly enhances the diffusion of Li+ ions (D-Li(+)) and notably decreases the electrochemical polarization of electrodes. The surface Li-ion conductor LiYO2 coating layer as a surface protector inhibits the side reaction and the gradient Y3+ doping supports the crystal structure, which can show synergistic effect in enhancing the electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode material. (C) 2018 Elsevier B.V. All rights reserved.
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