Sulfate Ion Influence of LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> as Cathode Material for Lithium-Ion Batteries

The residue sulfate ions (SO 4 2 - ) occurs in an adsorption and complex salt manner which are significant influence the electrochemical properties of LiNi 1/3 Co 1/3 Mn 1/3 O 2 as cathodes materials for lithium-ion batteries. Compare with different SO 4 2 - concentration electrochemical performance reveals that low SO 4 2 - concentration (0.28%) demonstrated a better charge/discharge cycle performance than the high SO 4 2 - concentration (0.48%) of LiNi 1/3 Co 1/3 Mn 1/3 O 2 , it maintains a capacity of 148.9 mAh·g −1 with a coulomb efficient of 91 % after 100 cycles which superior to the SO 4 2- concentration (0.48%) circulation coulomb efficient of 87%, respectively.