Effects of CNT/acetylene black composite conductive agent on LiNi0.5 Co0.2 Mn0.3 O2
In order to solve the problem of self-agglomeration of acetylene black single conductive agent,a conductive slurry containing carbon nanotubes(CNT)is used for modification.After compounding,spherical acetylene black particles with a diameter of 80-100 nm are evenly dispersed on the surface of CNT with a diameter of 20 nm,the specific surface area is increased to 107.96 m2/g.Compared with acetylene black conductive agent battery,CNT/acetylene black battery has smaller electrochemical impedance and larger CV curve area.The potential difference between the oxidation peak and reduction peak is smaller(0.19 V).When cycled at 200 mA/g in 2.75-4.20 V,the initial charge/discharge specific capacities of the CNT/acetylene black battery are 151.8 mAh/g and 155.5 mAh/g respectively,the initial Coulombic efficiency is 97.6%.After 200 cycles,the specific discharge capacity of CNT/acetylene black battery is 141.9 mAh/g,the capacity retention rate is 92.4%,the specific discharge capacity at 5.0 C is 116.9 mAh/g,the rate capability is better.
万方数据
