2024-03-29T07:19:21Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00016414
2023-01-16T05:07:21Z
488:489:490
Studies of Capacity Losses in Cycles and Storages for a Li1.1Mn1.9 O 4 Positive Electrode
Saitoh, Motoharu
49084
Sano, Mitsuru
49085
Fujita, Miho
49086
Sakata, Makoto
49087
Takata, Masaki
49088
Nishibori, Eiji
49089
lithium compounds
electrochemical electrodes
secondary cells
electron density
bonds (chemical)
A spinel-type of lithium-rich lithium manganese oxide, Li1.1Mn1.9O4, was prepared and studied electrochemically and structurally as a positive electrode of a Li-ion battery. In cycle performance tests, capacity losses were 3 and 11 mAh/g after 75 cycles at 25 and 55°C, respectively, corresponding to 15 and 50 mAh/g for a normal lithium manganese oxide, LiMn2O4. Their losses were divided into two parts; one resulting from the deterioration of the active material itself and the other due to the poor conduction of the active material to the collector. The former and latter contributions to the losses at 55°C were 2 and 9 mAh/g, respectively for the Li-rich spinel, and 18 and 32 mAh/g, respectively for the normal spinel. The capacity loss by the poor conduction was apparently much larger for both spinels of positive electrodes. Cycle performance tests in each region of the charge states divided into five regions show that relatively larger capacity losses were observed in lower potential states. However, in every region, a capacity loss for the Li-rich spinel was much smaller than that of the normal spinel. There was a close relation found between capacity losses in the storage and those in the cycle. Electron densities spreading between manganese and oxygen atoms were larger in the Li-rich than in the normal spinels. Thus, it turned out that the structure of the Li-rich spinel was made more stable because of strong Mn-O bonds.
journal article
The Electrochemical Society
2004
application/pdf
Journal of The Electrochemical Society
1
151
A17
A22
http://dx.doi.org/10.1149/1.1630038
http://hdl.handle.net/2237/18423
0013-4651
https://nagoya.repo.nii.ac.jp/record/16414/files/J_Electrochem_Soc_2004-Saitoh-A17-22.pdf
eng
https://doi.org/10.1149/1.1630038
© The Electrochemical Society, Inc. 2003. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of The Electrochemical Society. v.151, n.1, 2004, p.A17-A22.