Improved electrochemical and thermal performances of layered Li[Li_0.2Ni_0.17Co_0.07Mn_0.56]O₂ via Li₂ZrO₃ surface modification

Journal Article · Mon Feb 16 00:00:00 EST 2015 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2015.02.081· OSTI ID:1287001

Zhang, Xiaoping ^[1]; Sun, Shuwei ^[1]; Wu, Qing ^[1]; Wan, Ning ^[1]; Pan, Du ^[1]; Bai, Ying ^[2]

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1. Henan Univ., Kaifeng (China)
2. Henan Univ., Kaifeng (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We successfully coated a conductive Li₂ZrO₃ layer on the surface of Li-rich layered cathode Li[Li_0.2Ni_0.17Co_0.07Mn_0.56]O₂ in order to enhance its electrochemical performances. For the crystal structures, electrochemical properties and thermal stabilities of the bare and coated materials are studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), electron diffraction spectroscopy (EDS), inductively coupled plasma (ICP), galvanostatic cycling, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). We found that the electrochemical performances of Li-rich cathode material are obviously improved by Li₂ZrO₃ surface modification. Especially, the 1 wt.% Li₂ZrO₃-coated material demonstrates the best cycling performance, with capacity retention of 89% after 50 cycles, much better than that of the pristine one, 64%. Intensive explorations indicate that the improved electrochemical properties can be attributed to the Li₂ZrO₃ surface layer, which not only stabilizes the cathode structure by decreasing the loss of oxygen, but also protects the Li-rich cathode material from side reaction(s) with the electrolyte and thus suppressing the fast growth of solid electrolyte interface (SEI) film on the surface of oxide particles.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; National Natural Science Foundation of China (NNSFC)
• DOE Contract Number: AC05-00OR22725; 50902044
• OSTI ID: 1287001
• Journal Information: Journal of Power Sources, Vol. 282, Issue C; ISSN 0378-7753
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
25 ENERGY STORAGE
Surface modification
Electrochemical performances
Lithium-rich
Solid electrolyte interface (SEI) film
Lithium-ion batteries (LIBs)
LITHIUM-ION BATTERIES
CATHODE MATERIAL
ELECTRODES
LICOO2
DIFFRACTION
GRAPHITE
LIMN2O4
AL2O3