The effects of Ni and Li doping on the performance of lithium manganese oxide material for lithium secondary batteries

Ki Soo Park, Myung Hun Cho, Sang Ho Park, Kee Suk Nahm, Yang Kook Sun, Yun Sung Lee, Masaki Yoshio

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Abstract

Layered Li0.7[M1/6Mn5/6]O2 (M=Li, Ni) was synthesized using a sol-gel method. P2-Na0.7[M1/6Mn5/6]O2 precursor was first synthesized by a sol-gel method, and then O2-Li0.7[M1/6Mn5/6]O2 was prepared by an ion exchange of Li for Na in P2-Na0.7[M1/6Mn5/6]O2 precursor. From charge/discharge curves, it was seen that Li0.7[Li1/6Mn5/6]O2 has two plateaus similar to those observed from a spinel structure, but Li0.7[Ni1/6Mn5/6]O2 holds a single plateau as observed from a typical layered structure. It was considered that Li0.7[Li1/6Mn5/6]O2 undergoes a phase transformation from layered to spinel structure during the charge/discharge cycle, but Li0.7[Ni1/6Mn5/6]O2 maintains O2-layered structure after the cycles. Li0.7[Ni1/6Mn5/6]O2 was higher in discharge capacity and retention rate than Li0.7[Li1/6Mn5/6]O2.

Original languageEnglish
Pages (from-to)2937-2942
Number of pages6
JournalElectrochimica Acta
Volume47
Issue number18
DOIs
StatePublished - 2002 Jul 18

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Keywords

  • Glycolic acid
  • Layered structure
  • Lithium-ion battery
  • Ni doping
  • Sol-gel method

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