Surface stabilized LiNi0.5Mn1.5O4 cathode materials with high-rate capability and long cycle life for lithium ion batteries

► Li4P2O7 coated LiNi0.5Mn1.5O4 was prepared and characterized. ► Stoichiometric LiNi0.5Mn1.5O4 was synthesized as a control. ► Li4P2O7 coated and stoichiometric LiNi0.5Mn1.5O4 has different space groups. ► Li4P2O7 coated LiNi0.5Mn1.5O4 shows enhanced rate performance in Li half cells. ► Li4P2O7 coated LiNi0.5Mn1.5O4 full cells exhibit stable long cycling performance.