TY - JOUR
T1 - Anti-Oxygen Leaking LiCoO2
AU - Sharifi-Asl, Soroosh
AU - Soto, Fernando A.
AU - Foroozan, Tara
AU - Asadi, Mohammad
AU - Yuan, Yifei
AU - Deivanayagam, Ramasubramonian
AU - Rojaee, Ramin
AU - Song, Boao
AU - Bi, Xuanxuan
AU - Amine, Khalil
AU - Lu, Jun
AU - Salehi-khojin, Amin
AU - Balbuena, Perla B.
AU - Shahbazian-Yassar, Reza
N1 - Funding Information:
This project was financially supported by National Science Foundation (Award No. CMMI 1619743). The computational data is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE), as part of the Battery 500 Consortium, Award Number DE-EE0008210. Supercomputer resources from the Texas A&M University High Performance Computer Center and Texas Advanced Computing Center (TACC) are gratefully acknowledged. The acquisition of the UIC JEOL JEM-ARM200CF was supported by an MRI-R2 grant from the National Science Foundation (Award No. DMR-0959470). The work of A.S.-K. was supported by the National Science Foundation DMREF Grant 1729420. J.L. and K.A. gratefully acknowledge support from the U. S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office. Argonne National Laboratory is operated for DOE Office of Science by UChicago Argonne, LLC, under contract number DE-AC02-06CH11357. This work made use of instruments in the Electron Microscopy Service (Research Resources Center, UIC). S.S.A. and R.S.Y. initiated the idea and designed the experimental protocols. S.S.A. and T.F. carried out the graphene-coating and the characterization efforts. S.S.A. and Y.Y. performed the electrochemical cycling experiments. S.S.A. carried out in situ TEM/ EELS experiments and subsequent data analysis. M.A. and X.B. carried out the DEMS experiments, and the results were discussed and written in collaboration with A.S.K and J.L. B.S. draw the schematic figure. All the authors contributed to the writing and discussion of the manuscript.
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/6/6
Y1 - 2019/6/6
N2 - LiCoO2 is a prime example of widely used cathodes that suffer from the structural/thermal instability issues that lead to the release of their lattice oxygen under nonequilibrium conditions and safety concerns in Li-ion batteries. Here, it is shown that an atomically thin layer of reduced graphene oxide can suppress oxygen release from LixCoO2 particles and improve their structural stability. Electrochemical cycling, differential electrochemical mass spectroscopy, differential scanning calorimetry, and in situ heating transmission electron microscopy are performed to characterize the effectiveness of the graphene-coating on the abusive tolerance of LixCoO2. Electrochemical cycling mass spectroscopy results suggest that oxygen release is hindered at high cutoff voltage cycling when the cathode is coated with reduced graphene oxide. Thermal analysis, in situ heating transmission electron microscopy, and electron energy loss spectroscopy results show that the reduction of Co species from the graphene-coated samples is delayed when compared with bare cathodes. Finally, density functional theory and ab initio molecular dynamics calculations show that the rGO layers could suppress O2 formation more effectively due to the strong COcathode bond formation at the interface of rGO/LCO where low coordination oxygens exist. This investigation uncovers a reliable approach for hindering the oxygen release reaction and improving the thermal stability of battery cathodes.
AB - LiCoO2 is a prime example of widely used cathodes that suffer from the structural/thermal instability issues that lead to the release of their lattice oxygen under nonequilibrium conditions and safety concerns in Li-ion batteries. Here, it is shown that an atomically thin layer of reduced graphene oxide can suppress oxygen release from LixCoO2 particles and improve their structural stability. Electrochemical cycling, differential electrochemical mass spectroscopy, differential scanning calorimetry, and in situ heating transmission electron microscopy are performed to characterize the effectiveness of the graphene-coating on the abusive tolerance of LixCoO2. Electrochemical cycling mass spectroscopy results suggest that oxygen release is hindered at high cutoff voltage cycling when the cathode is coated with reduced graphene oxide. Thermal analysis, in situ heating transmission electron microscopy, and electron energy loss spectroscopy results show that the reduction of Co species from the graphene-coated samples is delayed when compared with bare cathodes. Finally, density functional theory and ab initio molecular dynamics calculations show that the rGO layers could suppress O2 formation more effectively due to the strong COcathode bond formation at the interface of rGO/LCO where low coordination oxygens exist. This investigation uncovers a reliable approach for hindering the oxygen release reaction and improving the thermal stability of battery cathodes.
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U2 - 10.1002/adfm.201901110
DO - 10.1002/adfm.201901110
M3 - Article
AN - SCOPUS:85063940106
SN - 1616-301X
VL - 29
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 23
M1 - 1901110
ER -