کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
194791 459800 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystal structure studies of thermally aged LiCoO2 and LiMn2O4 cathodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Crystal structure studies of thermally aged LiCoO2 and LiMn2O4 cathodes
چکیده انگلیسی

LiCoO2 and LiMn2O4 cathodes were studied by X-ray diffractometry (XRD) and electron diffraction after ageing in the charged state at elevated temperature. Some cathodes were stopped at different times during ageing and XRD measurements were taken to monitor changes in the crystal structure over ageing time. The results indicate that Li-ions intercalate into the cathodes lattice during ageing thus decreasing the available discharge capacity. Analysis of electron diffraction patterns of LiCoO2 and LiMn2O4 retrieved from the cathodes after ageing shows that irreversible crystallographic transformations have taken place in both electrodes. Dark field imaging illustrates that LiCoO2 forms a layer of spinel phase on its surface. In LiMn2O4 a tetragonal distorted spinel is observed when the cathode has been in the 3 V regime for considerable length of time.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 52, Issue 4, 1 December 2006, Pages 1499–1506
نویسندگان
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