Influence of Conductive Carbon Content Using a Three-Dimensional Foam-Type Current Collector for Lithium Ion Battery

Abstract

LiFePO 4 electrodes using three-dimensional NiCrAl metal foam of different conductive carbon content were prepared. Increasing the carbon black content greatly enhanced the rate performance, with a severe capacity fade shown for lower carbon black content with increases current rate. The electrode with no addition of carbon black showed very poor electrochemical performance, due to the high charge transfer resistance (R ct ) and high diffusion limitation of Li-ion. The electrodes of increased carbon black loadings enhanced the kinetic performance and dramatically decreased the R ct , due to the large effective contact area between the conductive carbon material and the LiFePO 4 particles. However, lower carbon black loading resulted in much higher areal capacity (mAh cm −2 ) at 0.2 and 0.5 C, due to increases in the amount of LiFePO 4 particles from reducing the carbon black loading. According to the results for 8 mA cm −2 , the specific capacity of 15 wt.%-electrode was higher than 10 wt.%-electrode. However, electrode polarization of 15 wt.%-electrode was more high than for 10 wt.%-electrode, due to high over-potential by the high current rate. That is to say the optimal conductive carbon content differs according to the intended use.

Electrode Architecture Design to Promote Charge‐Transport Kinetics in High‐Loading and High‐Energy Lithium‐Based Batteries

“…The effect of calendaring and conductive agent content on the electrochemical performance using the 3D Ni-Cr-Al foam were also discussed. [112][113][114] Besides Ni-based metal foam, the use of Cu foam and Al foam in thick electrodes were also reported. [115] The battery safety performance by using 3D metal foams was also investigated.…”

Ultra-Thick Cathodes for High-Energy Lithium-Ion Batteries Based on Aluminium Foams—Microstructural Evolution during Densification and Its Impact on the Electrochemical Properties

“…In spite of foam-type electrodes providing many significant advantages, few publications deal with this topic. Some of them consider inter alia the effect of electrode thickness [29] or the impact of the carbon content on the electrochemical performance of the electrode [30]. Even though it is well known that the microstructure of layered electrodes has a huge effect on the electrochemical performance [31][32][33] and Yang et al [34] postulated that the gravimetric and volumetric capacity can be adjusted by controlling the electrode density through a calendaring process, a detailed study of the correlation between electrode microstructure and the electrochemical performance is still missing to the best of our knowledge.…”

Structural Effect of Conductive Carbons on the Adhesion and Electrochemical Behavior of LiNi0.4Mn0.4Co0.2O2 Cathode for Lithium Ion Batteries

“…In addition, the particle size, structure, and aspect ratio of the active material and the conductive material greatly impact the adhesion strength and the electrochemical performance of the electrode [15,16]. Besides conducting electrons between the particles of the composite film, CC also forms an electronic conductive channel between the current collector surface and the composite film [17][18][19]. Tensile pull test [20], 180 o peeling test [21] and push-out bond strength technique [22] have been developed and employed in measuring the adhesion property of coated materials.…”