کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
189984 | 459691 | 2010 | 5 صفحه PDF | دانلود رایگان |
Spinel lithium manganese oxide was synthesized via co-precipitation. The prepared lithium manganese oxide powder was further heated at 700 °C for 15 h under pressurized (3 bar) oxygen atmosphere. The resultant exhibited a highly crystalline cubic spinel phase with space group Fd3m, as confirmed by X-ray diffraction. The spinel compound exhibited a slightly smaller lattice constant than a conventional spinel compound, even though the cationic ratio of Li/Mn is the same for both compounds. Chemical titration of the Mn component showed that heat treatment under a 3 bar oxygen atmosphere resulted in slightly higher average Mn oxidation state, indicating that the amount of Mn4+ increased after the treatment. The Li1.05Mn1.95O3.99 electrode exhibited improved cycling performance, namely, 96.3% of capacity retention during 100 cycles at elevated temperature (60 °C). The details of the structure and electrochemistry of the electrode are discussed.
Journal: Electrochimica Acta - Volume 55, Issue 28, 1 December 2010, Pages 8397–8401