Electrical Vehicles (EVs) are very important in reducing fossil oil consumption and carbon emission in cities. Spinel LiNi0.5Mn1.5O4 is one promising cathode material for lithium ion batteries used in EVs owing to its high power density. Here AlF3 coated LiNi0.5Mn1.5O4 is prepared through an newly developed method. The spinel oxide sintered at 900 ̊C presents the best electrochemical performance with a specific discharge capacity of 132.4 mAh/g at 0.5 C. 81.0% of the initial specific capacity can be retained after 50 cycles. AlF3 coating can further improve the electrochemical performance. The initial specific capacity at 10 C is enhanced from 104.6 to 109.1 mAh g-1 with the capacities retention increasing from 80.6 to 92.1% after 100 cycles.