In situ X-ray diffraction of layered LiCoO2-type cathode materials

被引：0
|
作者：
Rodriguez, MA [1 ]
Ingersoll, D [1 ]
Doughty, DH [1 ]
机构：
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
来源：
INTERCALATION COMPOUNDS FOR BATTERY MATERIALS, PROCEEDINGS | 2000年 / 99卷 / 24期
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D O I：
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中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
We have investigated LiNi0.8Co0.2O2 (Sumitomo) acid LiNi5/8Co1/4Mn1/16Al1/16O2 (Sandia chemical preparation method) cathode powders via in-situ X-ray Diffraction and Cyclic Voltammetry using a "coffee-bag" type electrochemical cell. Both cathode materials did not show a monoclinic distortion during de-intercalation but sustained the hexagonal structure up to 4.3 V. The doping of Co into the LiNiO2 structure appears to stabilize this lattice as the hexagonal structure over the full range of charging (up to 4.3 V). The LiNi5/8Co1/4Mn1/16Al1/16O2 cathode material exhibited a 160 mAh/g capacity (to 4.1 V) on its 1(st) cycle, while displayed a much smaller volume change (as compared to LiNi0.8CO0.2O2) during de-intercalation. This reduced overall volume change (2.5 vol%) may have important implications for cycle life of this material.
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页码：85 / 92
页数：6
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