Nanoscale TiO2 membrane coating spinel LiNi0.5Mn1.5O4 cathode material for advanced lithium-ion batteries

Spinel LiNi0.5Mn1.5O4 (LNMO) is one of the most promising high voltage cathode materials for future application. Herein, we report a simple method to prepare nanoscale TiO2- coated LNMO composites (LNMO-T). The thin TiO2 coating layer was pasted on the surface of host material, which favors Li+ ions diffusions. Compared to the bare LNMO, the surface modified composites LNMO-T shows outstanding rate capability and excellent cycling ability. In particularly, a discharge capacity of 74.5mAh/g can be still delivered at 15 degrees C and about 88.5% capacity retention at 2 degrees C after 500 cycles. These results suggest that the TiO2 coating can not only suppress the dissolution of manganese in the electrolyte but also enhance the conductivity of cathode. This study demonstrates that the potential of developing high energy density cathode materials by surface modification with TiO2 membrane at nanoscale for future applications. (C) 2017 Elsevier B.V. All rights reserved.