A new Li-rich layered cathode with low lattice strain for lithium-ion batteries.

A new layered C 2/ m oxide, Li 2 Ni 0.2 Mn 0.4 Ru 0.4 O 3 (LNMR), is introduced as a cathode for lithium-ion batteries, which undergoes a low volume variation of 1.5% in the voltage window of 2.0-4.6 V studied via in situ X-ray diffraction. Compared with the contrast sample Li 2 MnO 3 , LNMR displays superior capacity, a more stable capacity retention rate, and higher energy density and average discharge voltage.