Abstract
We developed a lithium ion nanobattery consisting of LiMn 2 O 4 nanowires cathode, ionic liquid electrolyte and Li 4 Ti 5 O 12 crystalline anode (see figure) and observed the structural change of the LiMn 2 O 4 nanowires by a transmission electron microscope simultaneously with monitoring the cyclic voltammogram [ 1 , 2 ] ( operand TEM observation). Cyclic voltammetry (CV) was performed by scanning voltage from 3.50 to 5.50 V vs Li/Li+ at 0.55 mV/s, which was relatively high rate. We found that at early stage of the discharge process, the cubic phase of LiMn 2 O 4 structure changed to mixing of the orthorhombic and cubic phases and to the tetragonal phase perfectly at 3.9V. The orthorhombic phase suggests that large amount of lithium ions must be accumulated at the interface region even at early stage. Our results suggest inhomogeneous lithium distribution in the cathode during the battery working.
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