科研之友
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摘要
Spinel LiMn2O4 is an attractive cathode material for rechargeable lithium-ion batteries. However, its cycling and rate performance need further improvement. Herein, we present a novel LiMn2O4 hollow microsphere cathode fabricated via a simple solid-state reaction utilizing MnO2 hollow microspheres and LiOH center dot H2O as the reactants. Interestingly, the as-prepared LiMn2O4 hollow microspheres are assembled by LiMn2O4 octahedral nanoparticles with exposed {111} planes, exhibiting abundant void spaces for the stress buffering and larger diffusion coefficient (1.570 x 10(-7) cm(2)s(-1)) for fast lithium ion transfer as compared to the simply aggregated LiMn2O4 nanoparticles. As a result, the LiMn2O4 hollow microspheres exhibit much improved cycling stability and deliver a specific discharge capacity of 86.3 mAh g(-1), at a high rate of 10C, higher than that of the aggregated LiMn2O4 (73.9 mAh g(-1)). Our work suggests that the electrochemical performance of LiMn2O4 cathode can be manipulated by the design of unique hollow sphere structure.
