Preparation and Electrochemical Properties of Multicomponent Conductive-Nanocarbon Additives for LFP Battery

The conductive additives are often used to improve the conductivity of the electrode in lithium iron phosphate battery. In this work, a series of carbon-based conductive slurries of acetylene black, carbon nanotubes and graphene were obtained by the ball milling method and applied to the cathodes of lithium iron phosphate batteries. The conductivity of the ternary conductive slurry reaches 11.98[Formula: see text]S[Formula: see text]cm[Formula: see text] and the result of Zeta potential indicates that the ternary conductive slurry has the best deposit stability. The average discharge capacity of lithium batteries with ternary conductive additive is 111.3[Formula: see text]mAh[Formula: see text]g[Formula: see text] at the current density of 10C, which is 1.9 times higher than that of acetylene black conductive additive batteries widely used nowadays. The specific capacity of the battery is 129.2[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 200 cycles at the current density of 5C, and the capacity retention rate is 99.7%. The ternary conductive materials can form a continuous “point-line-surface” conductive network, increase the contact sites between lithium iron phosphate particles and conductive materials and provide a more efficient transmission path.