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Lithium-rich layered Li[Li0.2Ni0.15Mn0.55Co0.1-xAlx]O2 (0≤x<0.1) cathode materials have been synthesized by a sol-gel method followed by high temperature annealing at two stages of 850°C and 900°C, respectively. Thermal gravity analysis (TGA), Powder X-ray diffraction (XRD) and Scanning electron microscope (SEM) characterizations prove that the materials have a typical α-NaFeO2 structure, uniform...
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