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Lithium-rich layered oxide Li[Li0.23Ni0.15Mn0.62]O2 and its Al-doped product Li[Li0.23Ni0.15Mn0.52Al0.10]O2 are synthesized via a sol−gel and calcining method, and are used as the cathode materials for lithium-ion batteries. Both samples show a layered α-NaFeO2 structure with R m symmetry. Compared with Li[Li0.23Ni0.15Mn0.62]O2, Li[Li0.23Ni0.15Mn0.52Al0.10]O2 shows better crystallinity, and exhibits more stable capacities and better rate performance during cycling. It possesses a capacity of >180 mAh g −1 at the current density of 20 mA g −1 , and displays nice capacity retention after rapid charging/discharging. Although the doped aluminum in Li[Li0.23Ni0.15Mn0.52Al0.1]O2 does not show obvious redox during cycling, it enhances the structural and electrochemical stability of the lithium-rich layered oxide.

Effect of Aluminum Doping on the Stability of Lithium-Rich Layered Oxide Li[Li0.23Ni0.15Mn0.52Al0.10]O2 as Cathode Material