Effect of Conductive Material Morphology on Spherical Lithium Iron Phosphate

Abstract

As an integral part of a lithium-ion battery, carbonaceous conductive agents have an important impact on the performance of the battery. Carbon sources (e.g., granular Super-P and KS-15, linear carbon nanotube, layered graphene) with different morphologies were added into the battery as conductive agents, and the effects of their morphologies on the electrochemical performance and processability of spherical lithium iron phosphate were investigated. The results show that the linear carbon nanotube and layered graphene enable conductive agents to efficiently connect to the cathode materials, which contribute to improving the stability of the electrode-slurry and reducing the internal resistance of cells. The batteries using nanotubes and graphene as conductive agents showed weaker battery internal resistance, excellent electrochemical performance and low-temperature dischargeability. The battery using carbon nanotube as the conductive agent had the best overall performance with an internal resistance of 30 mΩ. The battery using a carbon nanotube as the conductive agent exhibited better low-temperature performance, whose discharge capacity at −20 °C can reach 343 mAh, corresponding to 65.0% of that at 25 °C.

Designing High‐mass Loading 2D Ni‐TiO2/graphene Pellet Electrodes for Lithium Metal Batteries

“…Incorporating conductive carbon into electrode materials is an effective method for drastically reducing impedance and enhancing the battery's performance [47,48] . While preparing pellets, we optimized the addition of pPDA within the range of 0–40 % (denoted as NTO/Gr+PA%) in terms of impedance, Young's modulus, micromorphology, crystal structure, and electrochemical performance.…”

Binary carbon-based additives in LiFePO4 cathode with favorable lithium storage

“…The cycling performance and rate capability of the LiFePO 4 cathodes with different binary conductive compositions are shown in Figure 7. It can be found that the electrodes with binary conductive agents displayed better electrochemical performance than those with SP only, while the electrodes with the CNT-GN combination achieved both high capacity and good cycling stability (Figure 7a-c), which may be related to their respective merits and the synergistic effect [38,54]. Based on Figure 7b, as expected, the electrode with 5% GN (SP-GN-5:5) showed the highest reversible capacity, but the electrode capacity dropped sharply with further increase in the GN content (SP-GN-3:7), probably due to the steric effect from the large planar structure of GN nanosheets [55].…”

“…And the mechanism for enhancing the electrical conductivity of the electrodes is based on forming conduction bridges among active material particles. In this regard, a range of carbon materials such as carbon black (Super-P, SP), conducting graphite, and acetylene black are commonly adopted as the conductive agents to increase the capacity, rate capability, and cycling performance of the cathode system [29][30][31][32][33][34][35][36][37][38][39].…”

Improvement of Lithium Storage Performance of Silica Anode by Using Ketjen Black as Functional Conductive Agent

“…The literature has reported that conductive agents could be used as the mediator [31] to form a conductive network in electrodes, reducing the contact resistance of the electrode and improving the electron transport rate. Commercial carbon black, such as acetylene black (AB) and Super-P (SP), have been used as conductive agents in LIBs [32,33]. Compared with AB and SP, Ketjen Black (KB) has the advantages of large specific surface area, excellent electrical conductivity, and relatively narrow pore size distribution, when used as the conductive agent [34].…”