Abstract
MgAl 2 O 4 -doped LiMn 2 O 4 spinels, (LiMn 2 O 4 ) 1 - x (MgAl 2 O 4 ) x (x = 0, 0.02, 0.05, 0.10), were synthesized and the cycle performance as cathode material for lithium-ion secondary battery was investigated. Doping with MgAl 2 O 4 improved the cycle performance of LiMn 2 O 4 spinel. For (LiMn 2 O 4 ) 0 . 9 5 (MgAl 2 O 4 ) 0 . 0 5 the capacity fading was markedly suppressed compared to nondoped LiMn 2 O 4 . It is considered that stable Mg-O-Al bonds dispersed into the LiMn 2 O 4 matrix stabilized the whole crystal lattice through the common oxygen arrangement between MgAl 2 O 4 spinel and LiMn 2 O 4 spinel and inhibited the deterioration of the crystal structure due to the repetition of lithium insertion and deinsertion, resulting in the improvement of cycle performance.
Published Version
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