Charge/discharge behavior of Li[Ni0.20U0.20Mn0.60]O2 and Li[Co0.20Li0.27Mn0.53]O2 cathode materials in lithium secondary batteries

被引:57
作者
Hong, YS [1 ]
Park, YJ [1 ]
Ryu, KS [1 ]
Chang, SH [1 ]
机构
[1] Elect & Telecommun Res Inst, Ion Device Team, Taejon 305350, South Korea
关键词
lithium secondary battery; cathode;
D O I
10.1016/j.ssi.2005.02.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Layered cathode materials Li[Ni0.20Li0.20Mn0.6]O-2 and Li[Co0.20Li0.27Mn0.53]O-2 were prepared by a simple combustion method and their structural changes on charge/discharge cycling were investigated by ex situ X-ray diffraction (XRD) method and galvanostatic charge/discharge cycling. Rietveld refinement showed that both compounds adopt the same crystal structure, isostructural with Li2MnO3. A structural difference is that a small amount of Ni2+ ions occupies the lithium layers, resulting in [Li0.98Ni0.02](3a)[Ni0.18Li0.22Mn0.60](3b)[O-2](6c), while all the Co3+ ions the transition metal layers. After the 1st charge, the crystal structure of Li[Co0.20Li0.27Mn0.53]O-2 was transformed from layered into spinel phase. Interestingly, the Li[Co0.20Li0.27Mn0.53]O-2 exhibited an exceptionally high 1st charge capacity of 360 mA h/g and large irreversible capacity loss of 153 mA h/g. The discharge capacity of Li[Co0.20Li0.27Mn0.53]O-2 was also largely decreased from 207 to 110 mA h/g at the 30th cycle while that of Li[Ni0.20Li0.20Mn0.60]O-2 was stabilized from 288 to 213 m Ah/g. These results indicate the charge/discharge process is clearly different from each other and related to the structural difference. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:1035 / 1042
页数:8
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