Electrochemical characteristics of rancieite-type manganese oxide by mechanochemical synthesis

Sang Gil Woo, Hansu Kim, Churl Kyung Lee, Hun Joon Sohn, Tak Kang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Rancieite-type manganese oxide is synthesized by a mechanochemical method and its electrochemical characteristics as a cathode material for lithium secondary batteries are examined. The discharge capacity increases with milling time up to 45 h with a maximum of 274 mAhg-1. Further increase in milling time causes a decrease in capacity due to a phase transformation. Lithium insertion into the rancieite-type manganese cathode is composed of two processes, one between 2.0 and 4.0 V and the other between 1.5 and 2.0 V. The former is due to the reduction of Mn4+ to Mn3+, while the latter is due to the reduction of Mn3+ to Mn2+. These processes are identified by X-ray absorption spectra. The specific capacity of the rancieite-type manganese oxide shows good cycleability without transition to a spinel-like structure.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalJournal of Power Sources
Volume124
Issue number1
DOIs
StatePublished - 2003 Oct 1

Fingerprint

Manganese oxide
manganese oxides
Lithium
Cathodes
Secondary batteries
X ray absorption
synthesis
Manganese
cathodes
Absorption spectra
storage batteries
lithium batteries
Phase transitions
spinel
phase transformations
manganese
insertion
lithium
absorption spectra
causes

Keywords

  • Lithium-ion battery
  • Manganese oxide
  • Manganese oxide cathode
  • Mechanochemical synthesis
  • Rancieite
  • Soft X-ray absorption

Cite this

Woo, Sang Gil ; Kim, Hansu ; Lee, Churl Kyung ; Sohn, Hun Joon ; Kang, Tak. / Electrochemical characteristics of rancieite-type manganese oxide by mechanochemical synthesis. In: Journal of Power Sources. 2003 ; Vol. 124, No. 1. pp. 174-181.
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abstract = "Rancieite-type manganese oxide is synthesized by a mechanochemical method and its electrochemical characteristics as a cathode material for lithium secondary batteries are examined. The discharge capacity increases with milling time up to 45 h with a maximum of 274 mAhg-1. Further increase in milling time causes a decrease in capacity due to a phase transformation. Lithium insertion into the rancieite-type manganese cathode is composed of two processes, one between 2.0 and 4.0 V and the other between 1.5 and 2.0 V. The former is due to the reduction of Mn4+ to Mn3+, while the latter is due to the reduction of Mn3+ to Mn2+. These processes are identified by X-ray absorption spectra. The specific capacity of the rancieite-type manganese oxide shows good cycleability without transition to a spinel-like structure.",
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Electrochemical characteristics of rancieite-type manganese oxide by mechanochemical synthesis. / Woo, Sang Gil; Kim, Hansu; Lee, Churl Kyung; Sohn, Hun Joon; Kang, Tak.

In: Journal of Power Sources, Vol. 124, No. 1, 01.10.2003, p. 174-181.

Research output: Contribution to journalArticle

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T1 - Electrochemical characteristics of rancieite-type manganese oxide by mechanochemical synthesis

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AU - Kim, Hansu

AU - Lee, Churl Kyung

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AU - Kang, Tak

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AB - Rancieite-type manganese oxide is synthesized by a mechanochemical method and its electrochemical characteristics as a cathode material for lithium secondary batteries are examined. The discharge capacity increases with milling time up to 45 h with a maximum of 274 mAhg-1. Further increase in milling time causes a decrease in capacity due to a phase transformation. Lithium insertion into the rancieite-type manganese cathode is composed of two processes, one between 2.0 and 4.0 V and the other between 1.5 and 2.0 V. The former is due to the reduction of Mn4+ to Mn3+, while the latter is due to the reduction of Mn3+ to Mn2+. These processes are identified by X-ray absorption spectra. The specific capacity of the rancieite-type manganese oxide shows good cycleability without transition to a spinel-like structure.

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