Enhancing the cycle stability of Li–O₂ batteries via functionalized carbon nanotube-based electrodes

Abstract

3,5-Bis(trifluoromethyl)phenylmaleimide functionalized CNT buckypapers are prepared as a binder-free oxygen electrode for Li–O2 batteries with increased capacity and enhanced stability.

Polyethyleneimine-Functionalized Carbon Nanotube/Graphene Oxide Composite: A Novel Sensing Platform for Pb(II) Acetate in Aqueous Solution

“…The high-resolution band associated with the electron C 1s core-level of unmodified CNTs and PEI-functionalized CNTs are shown in Figure c,d, respectively. The band related to the C 1s electron of the unmodified CNTs displays the main peak near 284.3 eV, which can be resolved mainly by deconvolution into two peaks, generally attributed to sp 2 (284.2 eV) and sp 3 (284.9 eV) hybridized graphitic carbon atoms . The peak at 286 eV can be due to C–O–C bonds from impurities.…”

“…The band related to the C 1s electron of the unmodified CNTs displays the main peak near 284.3 eV, which can be resolved mainly by deconvolution into two peaks, generally attributed to sp 2 (284.2 eV) and sp 3 (284.9 eV) hybridized graphitic carbon atoms. 39 The peak at 286 eV can be due to C−O−C bonds from impurities. The C−C maximum peak of PEI-CNTs shows a significant up-shift from 284.3 to 285.0 eV compared to that of CNTs (Figure 2d), indicating rehybridization of sp 2 carbon to sp 3 carbon.…”

Electron-redistributed Ni–Co oxide nanoarrays as an ORR/OER bifunctional catalyst for low overpotential and long lifespan Li–O2 batteries

“…12 When the ORR/OER processes occur in the three-phase interface of a porous cathode, electrolyte, and O 2 , the porous cathode surface plays a crucial role in catalyzing the redox reactions of lithium peroxide, which determines the overpotential, redox reversibility, and lifespan. 5,[13][14][15] To reduce the overpotential of the lithium-oxygen batteries and enhance their cycling life, numerous catalysts have been designed to develop practical oxygen cathodes, such as carbonbased materials, [16][17][18] noble metals, [19][20][21] metal oxides, [22][23][24][25][26][27] metal nitrides, and suldes. [28][29][30] Among them, transition metal oxides stand out because of their adjustable chemical reactivity, satisfactory stability, and cost-effectiveness.…”

Performance and Sustainability Tradeoffs of Oxidized Carbon Nanotubes as a Cathodic Material in Lithium‐Oxygen Batteries

“…Carbon‐based LOB cathodes have been constructed using carbon nanofibers, [8,9] carbon black, [10,11] graphene, [12–14] and carbon nanotubes [10,15,16] . Of these materials, multi‐walled carbon nanotubes (MWCNTs) are particularly promising and have attracted significant interest as a result; [17–19] however, previous studies have reported widely variable specific discharge capacities at the same experimental conditions for MWCNT cathodes (Figure 1), [15,16,20–26] while there are very few systematic studies to explicitly evaluate the cycling life of MWCNT cathodes as it relates to their material properties. While some of this variation may stem from differences in cathode preparation methods, binders, and electrolytes, efforts to identify the MWCNT material properties that impact performance are complicated by a lack of robust characterization.…”

“… Specific discharge capacity of “pristine” (black) and “oxygen‐functionalized” (blue) MWCNT cathodes used in LOBs from 2011–2020 with a current density of 100 mA g −1 carbon and a final discharge potential of 2.0–2.4 V [15,16, 20–26] …”