Browse

Factors controlling the stability of O3- and P2-type layered MnO2 structures and spinel transition tendency in Li secondary batteries

Cited 23 time in Web of Science Cited 26 time in Scopus
Authors
Kim, Sa Heum; Im, Wan M.; Hong, Jin K.; Oh, Seung M.
Issue Date
2000
Publisher
Electrochemical Society
Citation
J. Electrochem. Soc., 147, 413 (2000)
Abstract
Cathode properties of two layered manganese dioxides (AxMnO2+·yH2O, where A is the pillaring alkali cations) having different crystal structures were compared in 3 V Li secondary batteries. The materials were prepared from the mixture of KNO3, LiOH, and MnO at 800 and 1050°C, respectively. The 800°C-prepared MnO2 has a trigonal Rm space group with an O3-type oxide-packing pattern, whereas the 1050°C material has an orthorhombic Cmcm symmetry with a P2-type oxide-packing pattern. The gallery space where the pillaring cations and water molecules reside is wider in the case of the 800°C material. Due to the higher mobility of pillaring cations in the 800°C material and similarity in the oxide-packing pattern (O3-type) to the spinel phases, the pillaring cations are easily leached out during cell cycling, which ultimately leads to a lattice collapse and structural transition to the spinel-related phases. By contrast, as the 1050°C material has rather immobile pillaring cations and its oxide-packing pattern (P2-type) is far different from that of the spinel phases, this cathode shows better cycling performance, with its structural integrity being well maintained.
ISSN
0013-4651
Language
English
URI
http://hdl.handle.net/10371/5706
DOI
https://doi.org/10.1149/1.1393211

https://doi.org/10.1149/1.1393211
Files in This Item:
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse