Facile and scalable dry surface doping technique to enhance the electrochemical performance of LiNi0.64Mn0.2Co0.16O2 cathode materials

Lithium nickel manganese cobalt oxide (NMC) is one of the dominant cathode materials in lithium-ion batteries. Here a simple, efficient and scalable surface doping technique is successfully demonstrated, which can be readily used in mass production of cathode materials. For the first time neodymium...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-01, Vol.8 (38), p.19866-19872
Main Authors: Yang, Shi, Kim, Kitae, Xing, Yingjie, Millonig, Andrew, Kim, Bryan, Wang, Lixin, Lee, Eunsung, Harrison, Chloe, Yu, Taehwan, Johnson, Derek C, Lipson, Albert L, Durham, Jessica L, Liu, Donghao, Fister, Timothy T, Yu, Lei, Wen, Jianguo
Format: Article
Language:English
Subjects:
Batteries
Cathodes
Cobalt
Cobalt oxides
Cracks
Cycles
Doping
Eels
Electrochemical analysis
Electrochemistry
Electrode materials
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Lithium
Lithium-ion batteries
Manganese
Mass production
Neodymium
Nickel
Rechargeable batteries
X-ray diffraction
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Summary:Lithium nickel manganese cobalt oxide (NMC) is one of the dominant cathode materials in lithium-ion batteries. Here a simple, efficient and scalable surface doping technique is successfully demonstrated, which can be readily used in mass production of cathode materials. For the first time neodymium oxide (Nd2O3) has been employed as the surface doping agent. The Nd-doped NMC shows greatly improved cycling and rate performance, and the enhanced cycling stability has been demonstrated in full pouch cells, with a 17.5% increase in capacity retention after 300 cycles. Fewer cracks have been observed in the doped NMC after cycling, and in situ X-ray diffraction reveals the suppressed lattice collapse by Nd doping. Greatly suppressed surface phase change has been confirmed by HR-TEM and EELS. The result suggests great promise in using this dry doping technique to enhance the electrochemical performance of NMC cathodes.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta07779h