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A series of Al-doped Li1+xNi0.5AlxMn1.5-xO4 cathode materials for lithium ion batteries are successfully synthesized via a co-precipitation method. Raman spectroscopy studies reveal that the cation-disordered tends to increase with the content of Al. The data of X-ray photoelectron spectroscopy (XPS) depth profiles reveal that the inert Al3+ ions segregates preferentially to the surface during the...
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