Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li0.2Mn0.54Ni0.13Co0.13]O2

In order to improve the initial charge/discharge efficiency and rate performance of Li[Li0.2Co0.13Ni0.13Mn0.54]O-2, we used citric acid and ammonium citrate tribasic to treat the materiel Li[Li0.2Co0.13Ni0.13Mn0.54]O-2, which was synthesized by carbonation co-precipitated method. After surface modification, Emission Spectrometer (ICP-AES) analysis showed that lithium is the major element of the filtrate, 16.37wt% and 13.14wt% of lithium elements dissolved out during the pretreatment stage respectively, and a small amount of transition metals desorpted in this process. The charging/discharging test revealed that the materials treated by 20% of citric acid and ammonium citrate tribasic performed higher initial efficiency (80.2% and 80.7%), After 40 cycles with 0.2C cycle, the capacity retention rate increased to 97.42% and 92.70% from 91.43%,and the capacity at 1C increased to 179.5 mAh.g(-1), 181.5 mAh.g(-1), respectively. The results showed that after the treatment of citric acid and ammonium citrate tribasic, material properties and the rate performance were both improved.