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http://dx.doi.org/10.5012/bkcs.2004.25.4.511

Cyclic Properties of Li[Co0.17Li0.28Mn0.55]O2 Cathode Material  

Park, Yong-Joon (Power Source Device Team, Electronics and Telecommunications Research Institute)
Hong, Young-Sik (Power Source Device Team, Electronics and Telecommunications Research Institute)
Wu, Xiang-Lan (Power Source Device Team, Electronics and Telecommunications Research Institute)
Kim, Min-Gyu (Beamline Research Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology)
Ryu, Kwang-Sun (Power Source Device Team, Electronics and Telecommunications Research Institute)
Chang, Soon-Ho (Power Source Device Team, Electronics and Telecommunications Research Institute)
Publication Information
Abstract
A Li$[Co_{0.17}Li_{0.28}Mn_{0.55}]O_2$ cathode compound was prepared by a simple combustion method. The X-ray diffraction pattern showed that this compound could be classified as ${\alpha} -NaFeO_2$ structure type with the lattice constants of a = 2.8405(9) ${\AA}$ and c = 14.228(4) ${\AA}$. According to XANES analysis, the oxidation state of Mn and Co ions in the compound were 4+ and 3+, respectively. During the first charge process, the irreversible voltage plateau at around 4.65 V was observed. The similar voltage-plateau was observed in the initial charge profile of other solid solution series between $Li_2MnO_3\;and\;LiMnO_2$ (M=Ni, Cr...). The first discharge capacity was 187 mAh/g and the second discharge capacity increased to 204 mAh/g. As the increase of cycling number, one smooth discharge profile was converted to two distinct sub-plateaus and the discharge capacity was slowly decreased. From the Co and Mn K-edge XANES spectra measured at different cyclic process, it can be concluded that irreversible transformation of phase is occurred during continuous cycling process.
Keywords
Cathode; Layered structure; Lithium battery; XANES; Cyclic properties;
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