Effectively enhance high voltage stability of LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode material with excellent energy density via La 2 O 3 surface modified

La2O3-coated LiNi1/3Mn1/3Co1/3O2 has been successfully synthesized via a wet chemical process followed. The 3 wt% La2O3-coated LiNi1/3Mn1/3Co1/3O2 illustrated highest rate capability, lowest voltage decay, outstanding cycling performance, and excellent energy density at the range of 2.5–4.5 V. The discharge capacity of LiNi1/3Mn1/3Co1/3O2 at a 5C rate increases from 86.9 to 137.5 mA h g−1 upon coating with La2O3 particles. The decrements of the average discharge voltages for 3 wt% La2O3-coated LiNi1/3Mn1/3Co1/3O2 electrode is 10.3 mV over 100th cycle and 26.9 mV over 200th cycle compared to 407 mV over 100th cycle for bare nickel cobalt manganese. The energy densities retention of 3 wt% La2O3-coated LiNi1/3Mn1/3Co1/3O2 is 96.5% after 100 cycles and 89.7% after 200 cycles compared to 34.5% after 100 cycles for bare LiNi1/3Mn1/3Co1/3O2. Universal but efficient, it can also be suitable to coat other layered cathode materials to ameliorate their electrochemical properties.