Advanced Carbon Cloth as Current Collector for Enhanced Electrochemical Performance of Lithium‐Rich Layered Oxide Cathodes

Abstract

In this study, pristine and modified carbon cloth replaced with Al foil as current collector for lithium‐rich layered oxide cathodes (Li1.2Mn0.6Ni0.2O2, LLO). The modified carbon cloths were prepared by modification of the pristine carbon cloth with phenolic resin (PR) and carbon nanotubes (CNT), followed by carbonization at 1000oC in nitrogen atmosphere. The first charge‐discharge capacities of the lithium‐rich layered oxide cathodes using the carbon cloth as current collector were 312 mAhg−1 and 252 mAhg−1, respectively, which was comparable with Al foil. Interestingly, an improved rate capability was obtained. After 100 cycles, the capacity of the carbon cloth was 138 mAhg−1 and 78 mAhg−1 in comparison with that of Al foil, 125 mAhg−1 and 50 mAhg−1 under 1 C and 5 C rate, respectively. In addition, after 100 cycles, no significant changes on the morphology and Id/Ig value of Raman spectra were observed. According to electrochemical impedance spectra (EIS), the charge transfer resistance of the carbon cloth, 12 ohm, was significantly lower than that of Al foil, 166 ohm. As a consequence, the enhanced rate capability was obtained. The lower resistance was associated with the increased surface area, better adhesion between the slurry and current collector interface and formation of semi‐ionic C−F bonds.

High Mass‐Loading Biomass‐Based Porous Carbon Electrodes for Supercapacitors: Review and Perspectives

“…Wang et al investigated the lithium-rich layered oxide cathode with carbon cloth as the current collector, which has achieved good rate performance (Figure 18b). [235] Gu et al reported that commercial CC could be activated simply by heating in air at a moderate temperature. [239] Pristine CC is not an attractive electrochemically active material due to its low areal specific capacitance arising from the poor electrochemical activity and small surface area.…”

“…investigated the lithium‐rich layered oxide cathode with carbon cloth as the current collector, which has achieved good rate performance (Figure 18b). [ 235 ] Gu et al. reported that commercial CC could be activated simply by heating in air at a moderate temperature.…”

A review of current collectors for lithium-ion batteries

“…Current collectors can greatly influence the performance of LIBs. For example, improving the electrical conductivity, reducing contact resistance and increasing the corrosion resistance of current collectors are beneficial to increase the capacity, rate capability, efficiency and cycle stability of LIBs [15]. Considering current collectors are essentially non-active materials in LIBs, reducing the thickness of current collectors can reduce the weight percentage and thus increase the energy density of LIBs.…”

Tensile Property and Corrosion Performance of Ag Microalloying of Al-Cu Alloys for Positive Electrode Current Collectors of Li-Ion Batteries

“…[ 11 ]. For example, the improvement of conductivity and corrosion resistance of the current collector contributes to the improvement of capacity, charge and discharge efficiency, and cycle stability of LIBs [ 12 ]. Aluminum alloys are widely employed as current collectors in LIBs due to their excellent conductive properties.…”