酸化マンガン多孔体への含浸処理によるリチウムイオン電池正極材料の合成と電池特性

概要

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Spherical porous Mn2O3 powders were prepared by spray pyrolysis. Lithium and aluminum nitrate solution were immersed to porous Mn2O3 powders to obtain LiAlXMn2-XO4 powders. Homogeneous LiAlXMn2-XO4 powders were formed by the calcination at 800°C. SEM observation showed that they had spherical morphology with dense microstructure. XRD revealed that the spinel phase was formed by the calcination at 700°C. LiAlXMn2-XO4 cathode obtained by this method exhibited higher rechargeable capacity and cycle stability than that of LiMn2O4. The rechargeable capacity of LiAl0.05Mn1.95O4 exhibited 120mAh/g at 1C and 90mAh/g at 10C, respectively. 91% of initial discharge capacity was maintained after 500 cycles at a rate of 1C. The doping of aluminum ion was effective for the cycle stability of LiMn2O4 cathode at 50°C.