Interaction of Li1+x (Ni,Mn,Co)O2 cathode materials with single and complex oxides at 900 °C

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• 作者：Konstantin A. Kurilenko ; Daniil V. Gorbunov ; Oleg A. Shlyakhtin
• 刊名：Ionics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：22
• 期：5
• 页码：601-607
• 全文大小：713 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760
• 卷排序：22

文摘

In order to find efficient barrier materials and inert dopants for the high temperature processing of Li-ion battery cathode materials, a chemical stability of Li_1+x(Ni,Mn)O₂ at 900 °C in air in contact with Al₂O₃, Nb₂O₅, SnO₂, TiO₂, and CeO₂ is studied. The interaction of Li_1+x(Ni,Mn)O₂ with Al₂O₃, Nb₂O₅, and SnO₂ results in the formation of the corresponding complex oxides—LiAlO₂, Li₃NbO₄, and Li₂SnO₃. A first stage of the chemical degradation of Li_1+x(Ni,Mn)O₂ is usually accompanied by the transformation of its hexagonal crystal structure into the cubic one. The reaction of Li_1+x(Ni,Mn)O₂ with titania is accompanied by the disappearance of TiO₂ and the formation of the Li_1+x(Ni,Mn)O₂-based solid solution. XRD analysis confirmed the absence of chemical interaction of Li_1+x(Ni,Mn)O₂ with CeO₂ while SEM data demonstrated the absence of eutectic melting at 900 °C. The similar absence of traces of the high temperature chemical interaction with Li_1+x(Ni,Mn)O₂ is found also for LiAlO₂, Li₃NbO₄, and Li₂SnO₃. Galvanostatic and cyclic voltammetry studies of Li_1+x(Ni,Mn,Co)O₂–CeO₂ composites demonstrated the increase in the initial discharge capacity of the composite cathodes compared to the native Li_1+x(Ni_,Mn_,Co)O₂.KeywordsLi-ion batteryCathode materialsChemical stabilitySolid state reactionsHigh temperature processing