Fibrous network of highly integrated carbon nanotubes/MoO3 composite bundles anchored with MoO3 nanoplates for superior lithium ion battery anodes

Porous Microspheres Comprising CoSe2 Nanorods Coated with N-Doped Graphitic C and Polydopamine-Derived C as Anodes for Long-Lived Na-Ion Batteries

“…However, a substantial decrease in the R ct (P-CoSe 2 @PDA-C NR: 81 Ω, P-CoSe 2 @NGC NR: 88 Ω, and bare CoSe 2 hollow microspheres: 83 Ω) was observed for all samples after five cycles due to the formation of ultrafine CoSe 2 nanocrystals in the structure after the first cycle (Fig. 7b) [66][67][68]. After the 300th cycle (Fig.…”

Growth, characterization and performance of bulk and nanoengineered molybdenum oxides for electrochemical energy storage and conversion

“…The anode composite has high specific capacities of 972 mAh g -1 after 100 cycles at 1 A g -1 and 905 mAh g -1 after 800 long-term cycles at 2 A g -1 . Rate capability tests show discharge capacities of 599 and 374 mAh g -1 at 5 and 10 mAh g -1 rate, respectively [279]. The ternary composite MoO3/V2O5/C having the morphology of nanofibers with the diameter of 200~500 nm was synthesized by electrospinning combined with heat treatment.…”

Porous nanofibers comprising hollow Co 3 O 4 / Fe 3 O 4 nanospheres and nitrogen‐doped carbon derived by Fe@ ZIF ‐67 as anode materials for lithium‐ion batteries

“…The semicircles observed at the medium-frequency range in Nyquist plots indicate the charge-transfer resistance (R ct ) of electrodes. 53 The R ct values of samples were 1650, 399, 288, and 203 Ω for A200NF, A300NF, A400NF, and A500NF, respectively, before cycling (Figure 7A). The R ct values of the samples decreased to 42 Ω for A300NF, 41 Ω for A400NF, and 42 Ω for A500NF after the first cycle because of the doped C matrix improve the electrical conductivity as well as structural stability of A300NF.…”

“…The superior Li + storage activity of A300NF is further supported by the electrochemical impedance spectroscopy (EIS) analyses before and after 1, 100, and 150 cycles in the fully charged state, which is fitted with a Randle‐type equivalent‐circuit model (Figure S16A,B) shown in Figure 7. The semicircles observed at the medium‐frequency range in Nyquist plots indicate the charge‐transfer resistance (R ct ) of electrodes 53 . The R ct values of samples were 1650, 399, 288, and 203 Ω for A200NF, A300NF, A400NF, and A500NF, respectively, before cycling (Figure 7A).…”