Titre du document / Document title

Electrochemical characteristics of rancieite-type manganese oxide by mechanochemical synthesis

Auteur(s) / Author(s)

WOO Sang-Gil ⁽¹⁾ ; HANSU KIM ⁽²⁾ ; CHURL KYUNG LEE ⁽³⁾ ; SOHN Hun-Joon ⁽¹⁾ ; TAK KANG ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ School of Materials Science and Engineering, Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-742, COREE, REPUBLIQUE DE
⁽²⁾ Samsung Advanced Institute of Technology, San 14-1, Nongseo-ri, Giheung-eup, Yongin-si, Gyeonggi-do 449-712, COREE, REPUBLIQUE DE
⁽³⁾ School of Materials and System Engineering, Kumoh National Institute of Technology, Kumi, Kyungbuk 730-701, COREE, REPUBLIQUE DE

Résumé / 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 mAh g^-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.

Revue / Journal Title

Journal of power sources   ISSN 0378-7753   CODEN JPSODZ 

Source / Source

2003, vol. 124, n^o1, pp. 174-181 [8 page(s) (article)] (29 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier Sequoia, Lausanne, SUISSE  (1976) (Revue)

Mots-clés anglais / English Keywords

X ray absorption ; X ray absorption spectrometry ; Specific capacity ; Cathode ; Electrode material ; Manufacturing process ; Manganese oxides ; Electrochemical characteristic ; Lithium batteries ;

Mots-clés français / French Keywords

Absorption RX ; Spectrométrie absorption RX ; Capacité spécifique ; Cathode ; Matériau électrode ; Procédé fabrication ; Manganèse oxyde ; Caractéristique électrochimique ; Batterie lithium ;

Mots-clés espagnols / Spanish Keywords

Absorción RX ; Espectrometría absorción RX ; Capacidad específica ; Cátodo ; Material electrodo ; Procedimiento fabricación ; Manganeso óxido ; Característica electroquímica ;

Mots-clés d'auteur / Author Keywords

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

Localisation / Location

INIST-CNRS, Cote INIST : 17113, 35400011912616.0250