Stepwise charging and calcination atmosphere effects for iron and nickel substituted lithium manganese oxide positive electrode material
| Autor: | Kyosuke Doumae, Hiroyuki Kageyama, Hideka Shibuya, Mitsuharu Tabuchi, Noriyuki Tamura, Ryota Yuge |
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| Rok vydání: | 2016 |
| Předmět: |
Electrode material
Renewable Energy Sustainability and the Environment 020209 energy Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Electrochemistry law.invention Atmosphere Nickel chemistry law Lithium manganese oxide Air atmosphere 0202 electrical engineering electronic engineering information engineering Calcination Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 313:120-127 |
| ISSN: | 0378-7753 |
| Popis: | Fe- and Ni-substituted Li 2 MnO 3 (Li 1+x (Fe y Ni y Mn 1−2y ) 1−x O 2 , 0 x y = 0.1, 0.15, 0.2) was prepared using coprecipitation–calcination. Its electrochemical properties were sensitive to the calcining atmosphere or the charging mode. Calcination in N 2 atmosphere or selecting stepwise charging mode respectively engender better electrochemical performance than calcination in an air atmosphere or selecting galvanostatic charging mode. In fact, the sample for which y = 0.15 calcined in N 2 atmosphere exhibited higher discharge capacity than that for the sample calcined in air atmosphere when stepwise charging mode was selected. By selecting stepwise charging mode instead of galvanostatic charging mode, the initial discharge capacity was increased and cyclability was improved. Among the samples calcined in N 2 atmosphere, samples for which y = 0.1 and 0.15 were found to have attractive composition as positive electrode materials by selecting stepwise charging mode. |
| Databáze: | OpenAIRE |
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