Capacity fading of the acid-treated lithium manganese oxides in high-temperature storage |
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| Affiliation: | 1. Graduate School of Human Informatics, Nagoya University, Nagoya 464-8601, Japan;2. Graduate School of Natural Sciences, Nagoya City University, Nagoya 467-8501, Japan;3. Faculty of Science, Osaka Women University, Sakai 590-0035, Japan;1. Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Université de Tunis El-Manar, Campus Universitaire Farhat Hached d''El-Manar, Tunis 2092, Tunisia;2. Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Facultad de Ciencias, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain;1. Universidade de Franca – UNIFRAN, CP 82, Franca, SP 14404-600, Brazil;2. Centre d’Elaboration de Matériaux et d’Etudes Structurales, Université de Toulouse-UPS, 29 rue Jeanne Marvig, B.P. 4347, 31055 Toulouse CEDEX 4, France;1. NICHe, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, 9808579 Japan;2. Institute of Physics AS CR, Cukrovarnicka 10, Prague 6,16200, Czech Republic;3. Tokuyama Corporation, Kasumigaseki Common Gate West Tower 2-1, Kasumigaseki 3-chome, Chiyoda-ku, Tokyo, 1008983, Japan;4. Institute for Materials Research, 2-1-1 Katahira, Aoba-ku, Sendai, 9808577 Japan;1. College of Chemistry and Materials science, Sichuan Normal University, Chengdu 610066, China;2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;1. Research and Development Centre, Bharathiar University, Coimbatore, Tamilnadu, India;2. Periyar Arts College, Cuddalore-607001, Tamilnadu, India |
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| Abstract: | We have studied capacity fadings of acid-treated lithium manganese oxides in high-temperature storage. The amounts of dissolved lithium and manganese ions and consumed acids were determined in the reaction of lithium manganese oxides with acids. Discharge capacities of the acid-treated samples were measured and the small capacity fadings were observed. X-ray diffraction patterns of the acid-treated samples were almost the same as the one before the acid-treatment.After the acid-treated samples were stored in the EC/DMC solutions without Mn and Li ions at 80 °C for 24 h, they gave no further capacity fadings. On the other hand, after the storage under the same condition but in the EC/DMC solution containing both Mn and Li ions, the same acid-treated samples as above showed large capacity fadings. Thus, the following mechanism is deduced; the acid-treated lithium manganese oxide would react with Mn and Li ions in the solution, and its spinel structure would partly be fractured to result in the severe capacity fading. |
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