XPS Study on Al2O3- and AlPO4-Coated LiCoO2 Cathode Material for High-Capacity Li Ion Batteries

The impact of aluminum oxide coatings on LiCoO 2 materials for commercial lithium ion batteries has been investigated by X-ray photoelectron spectroscopy (XPS). A low binding energy component in the Al 2p core peak spectra was observed and attributed to the formation of a LiAl x Co (1-x) O 2 solid solution interphase for both Al 2 O 3 - and AlPO 4 -coated LiCoO 2 . The surface chemistry of pristine and Al 2 O 3 -coated LiCoO 2 cathodes and graphite anodes have been investigated after cycling up to 4.2 V or 4.4 V cutoff voltage and after various levels of capacity fade. The Al 2 O 3 coating enhances the capacity retention at both 4.2 V and 4.4 V cutoff voltages. XPS analyses provided evidence of the inhibition of cobalt dissolution from the LiCoO 2 positive electrode by the aluminum coatings. Moreover, the Al 2 O 3 coating lowers the kinetics of degradation of electrolyte species, especially the LiPF 6 salt.

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