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Title: Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery

Abstract

Nonstoichiometric spinel oxides, LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} (x=0.1,0.2), were synthesized under controlled partial pressure of oxygen, and their elecrochemical performances were investigated. As an Al content increases, solubility limit of the oxygen nonstoichiometry, {delta}, increased, while partial molar enthalpy {delta}H-bar {sub O{sub 2}} of the formation of oxygen nonstoichiometry decreased. Cycle performance of LiAl{sub x}Mn{sub 2-x}O{sub 4} showed significant improvement comparing with that of LiMn{sub 2}O{sub 4} cathode. However, the decrease of theoretical capacity was accompanied with Al doping. Nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed the increase in capacity with keeping good cycle performances as well as stoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4}. Although the introduction of oxygen nonstoichiometry leads to the increase of Mn{sup 3+} which is known as Jahn-Teller ion, DSC curves for LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed no exothermic peak due to phase transition arising from Jahn-Teller distortion around room temperature.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Department of Applied Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552 (Japan)
Publication Date:
OSTI Identifier:
20902479
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 179; Journal Issue: 11; Other Information: DOI: 10.1016/j.jssc.2006.07.023; PII: S0022-4596(06)00418-X; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; ELECTRIC BATTERIES; ELECTROCHEMISTRY; ENTHALPY; LITHIUM COMPOUNDS; LITHIUM IONS; MANGANESE COMPOUNDS; MANGANESE IONS; OXIDES; PARTIAL PRESSURE; PERFORMANCE; PHASE TRANSFORMATIONS; SPINELS; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Cho, Woosuk, Ra, Wonkyung, Shirakawa, Junichi, Nakayama, Masanobu, and Wakihara, Masataka. Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2006.07.023.
Cho, Woosuk, Ra, Wonkyung, Shirakawa, Junichi, Nakayama, Masanobu, & Wakihara, Masataka. Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery. United States. doi:10.1016/j.jssc.2006.07.023.
Cho, Woosuk, Ra, Wonkyung, Shirakawa, Junichi, Nakayama, Masanobu, and Wakihara, Masataka. Wed . "Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery". United States. doi:10.1016/j.jssc.2006.07.023.
@article{osti_20902479,
title = {Synthesis and electrochemical properties of nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} as cathode materials for rechargeable lithium ion battery},
author = {Cho, Woosuk and Ra, Wonkyung and Shirakawa, Junichi and Nakayama, Masanobu and Wakihara, Masataka},
abstractNote = {Nonstoichiometric spinel oxides, LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} (x=0.1,0.2), were synthesized under controlled partial pressure of oxygen, and their elecrochemical performances were investigated. As an Al content increases, solubility limit of the oxygen nonstoichiometry, {delta}, increased, while partial molar enthalpy {delta}H-bar {sub O{sub 2}} of the formation of oxygen nonstoichiometry decreased. Cycle performance of LiAl{sub x}Mn{sub 2-x}O{sub 4} showed significant improvement comparing with that of LiMn{sub 2}O{sub 4} cathode. However, the decrease of theoretical capacity was accompanied with Al doping. Nonstoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed the increase in capacity with keeping good cycle performances as well as stoichiometric LiAl{sub x}Mn{sub 2-x}O{sub 4}. Although the introduction of oxygen nonstoichiometry leads to the increase of Mn{sup 3+} which is known as Jahn-Teller ion, DSC curves for LiAl{sub x}Mn{sub 2-x}O{sub 4-{delta}} showed no exothermic peak due to phase transition arising from Jahn-Teller distortion around room temperature.},
doi = {10.1016/j.jssc.2006.07.023},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 11,
volume = 179,
place = {United States},
year = {2006},
month = {11}
}