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首页> 外文期刊>Bulletin of the Korean Chemical Society >Cyclic Properties of Li[Co_(0.17)Li_(0.28)Mn_(0.55)]O_2 Cathode Material
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Cyclic Properties of Li[Co_(0.17)Li_(0.28)Mn_(0.55)]O_2 Cathode Material

机译：Li [Co_（0.17）Li_（0.28）Mn_（0.55）] O_2阴极材料的循环特性

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摘要

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)A and c=14.228(4)A.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.
机译：采用简单燃烧法制备了Li [Co_（0.17）Li_（0.28）Mn_（0.55）O_2正极化合物。X射线衍射图谱表明该化合物可以归类为α-NaFeO_2结构类型，其晶格常数为a = 2.8405（9）A和c = 14.228（4）A。根据XANES分析，化合物中Mn和Co离子的氧化态分别为4+和3+。在第一次充电过程中，不可逆电压在Li_2MnO_3和LiMnO_2（M = Ni，Cr ...）之间的其他固溶体系列的初始充电曲线中观察到了大约4.65 V的平稳电压峰。第一次放电容量为187 mAh / g和二次放电容量增加到204 mAh / g。随着循环次数的增加，一个平滑的放电曲线转变为两个不同的亚高原，放电容量缓慢下降。从Co和Mn K边缘XANES光谱测量不同的循环过程，可以得出结论：在连续循环过程中发生相位变化。

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