Multilayer NiO@Co₃O₄@graphene quantum dots hollow spheres for high-performance lithium-ion batteries and supercapacitors

Abstract

Multilayer NiO@Co3O4 hollow spheres are modified by graphene quantum dots and exhibit superior performances for lithium-ion batteries and supercapacitors.

Conductive metal‐organic frameworks: Recent advances in electrochemical energy‐related applications and perspectives

“…The change of peak intensity in the ex situ X‐ray diffraction (XRD) pattern during the first charge and discharge also shows its stable crystal structure 72 . More strikingly, the M 3 (HHTP) 2 (M = Cu, Co, and Ni) electrodes all exhibits high lithium‐ion diffusion coefficients ( D Li+ ) of approximately 10 −10 to 10 −9 cm 2 /s during the discharging process (Figure 5F), which are higher than that of hollow Fe–Mn–O/C microspheres, hollow NiO@Co 3 O 4 @graphene quantum dot spheres, ZnCo 2 O 4 @CNTs, and so on 73‐75 . The superb D Li+ values guarantee the remarkable high‐rate reversible capacity and cyclic performance of the M 3 (HHTP) 2 (M = Cu, Co, and Ni) anodes.…”

Construction of 1D conductive Ni-MOF nanorods with fast Li+ kinetic diffusion and stable high-rate capacities as an anode for lithium ion batteries

“…As plotted in Fig. 3b, the D Li values of the Ni-CAT NRs are in the order of 10 À9 cm 2 s À1 for the discharge case, which is much higher than those of other anodes including hollow Fe-Mn-O/C microspheres ($10 À12 cm 2 s À1 ), 10 N-doped yolk-shell carbon nanocages lled with ZnSe/CoSe 2 nanodots ($10 À15 cm 2 s À1 ), 14 hollow NiO@Co 3 O 4 @graphene quantum dot spheres ($10 À15 cm À2 s À1 ), 15 ZnCo 2 O 4 @carbon nanotubes ($10 À11 cm À2 s À1 ), 16 and so on. Notably, the changing trend of the D Li values during charging (Fig.…”

Tailored Synthesis of Coral‐Like CoTiO3/Co3O4/TiO2 Nanobelts with Superior Lithium Storage Capability

“…As shown in Figure c, of note is the discharge capacity fading during the first 100 cycles for CCTNBs, which is normally observed for transitional metal oxide‐based anodes. This phenomenon is generally attributed to the reversible formation of an unstable SEI layer and decomposition of the electrolyte originating from kinetic activation in the electrode . More astoundingly, the specific capacity can rise up to 256.7 mAh g −1 during the subsequent 500 cycles and is kept stable until 1000 cycles without noticeable decay.…”