Abstract
Layered metastable lithium manganese oxides, Li 2/3[Ni 1/3− x Mn 2/3− y M x+ y ]O 2 ( x = y = 1/36 for M = Al, Co, and Fe and x = 2/36, y = 0 for M = Mg) were prepared by the ion exchange of Li for Na in P2-Na 2/3[Ni 1/3− x Mn 2/3− y M x+ y ]O 2 precursors. The Al and Co doping produced the T #2 structure with the space group Cmca. On the other hand, the Fe and Mg doped samples had the O6 structure with space group R-3 m. Electron diffraction revealed the 1:2 type ordering within the Ni 1/3− x Mn 2/3− y M x+ y O 2 slab. It was found that the stacking sequence and electrochemical performance of the Li cells containing T #2-Li 2/3[Ni 1/3Mn 2/3]O 2 were affected by the doping with small amounts of Al, Co, Fe, and Mg. The discharge capacity of the Al doped sample was around 200 mAh g −1 in the voltage range between 2.0 and 4.7 V at the current density of 14.4 mA g −1 along with a good capacity retention. Moreover, for the Al and Co doped and undoped oxides, the irreversible phase transition of the T #2 into the O2 structure was observed during the initial lithium deintercalation.
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