Oxalate co-precipitation synthesis of LiNi_0.45Cr_0.05Mn_1.5O₄/Ag composite for lithium-ion batteries

The rate capability and cyclic performance of the LiNi_0.5Mn_1.5O₄ under high current density have been significantly improved by doping a small amount of chromium (Cr). Specifically, LiNi_0.45Cr_0.05Mn_1.5O₄ and LiNi_0.45Cr_0.05Mn_1.5O₄/Ag synthesized by co-precipitation reaction can respectively deliver a discharge capacity of 122 and 128 mA h g^–1 at 5 °C rate. At 0.5 C discharge rate, LiNi_0.45Cr_0.05Mn_1.5O₄ and LiNi_0.45Cr_0.05Mn_1.5O₄/Ag can maintain 94.6% and 98.5% of their initial capacity after 200 cycles respectively. The result demonstrates that Cr-doping and Ag-coating could be a way to enhance the electrochemical performance of spinel LiNi_0.5Mn_1.5O₄.