Electrochemical performance of Li-rich oxide composite material coated with Li 0.75 La 0.42 TiO 3 ionic conductor

Chun Chen Yang*, Pin Ci Liao, Yi Shiuan Wu, Shingjiang Jessie Lue

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

14 Scopus citations

Abstract

Li-rich (spray-dried (SP)-Li 1.2 Ni 0.2 Mn 0.60 O 2 ) composite materials were prepared via two-step ball-mill and spray dry methods by using LiOH, α-MnO 2 , β-Ni(OH) 2 raw materials. Two raw materials of α-MnO 2 nanowires and microsphere β-Ni(OH) 2 were synthesized by a hydrothermal process. In addition, Li 0.75 La 0.42 TiO3 (LLTO) fast ionic conductor was coated on SP-Li 1.2 Ni 0.2 Mn 0.60 O 2 composite via a sol–gel method. The properties of the LLTO-coated SP-Li 1.2 Ni 0.2 Mn 0.60 O 2 composites were determined by X-ray diffraction, scanning electron microscopy, micro-Raman, XPS, and the AC impedance method. The discharge capacities of 1 wt.%-LLTO-coated SP-Li 1.2 Ni 0.2 Mn 0.60 O 2 composites were 256, 250, 231, 200, 158, and 114 mAh g −1 at rates of 0.1, 0.2, 0.5, 1, 3, and 5C, respectively, in the voltage range 2.0–4.8 V. The 1 wt.%-LLTO-coated Li-rich oxide composite showed the discharge capacities of up to 256 mAh g −1 in the first cycle at 0.1C. After 30 cycles, the discharge capacity of 244 mAh g −1 was obtained, which showed the capacity retention of 95.4%.

Original languageEnglish
Pages (from-to)670-681
Number of pages12
JournalApplied Surface Science
Volume399
DOIs
StatePublished - 31 03 2017

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Fast ionic conductor
  • Li La TiO
  • Li Ni Mn O
  • Li-rich oxide
  • Spray drying

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