Synergistic Interactions of Different Electroactive Components for Superior Lithium Storage Performance

Abstract

The fusion of different electroactive components of lithium-ion batteries (LIBs) sometimes brings exceptional electrochemical properties. We herein report the reduced graphene-oxide (rGO)-coated Zn2SnO4z @NiO nanofibers (ZSO@NiO@G NFs) formed by the synergistic fusion of three different electroactive components including ZnO, SnO2, and NiO that exhibit exceptional electrochemical properties as negative electrodes for LIBs. The simple synthetic route comprised of electrospinning and calcination processes enables to form porous one-dimensional (1D) structured ZSO, which is the atomic combination between ZnO and SnO2, exhibiting effective strain relaxation during battery operation. Furthermore, the catalytic effect of Ni converted from the surface-functional NiO nanolayer on ZSO significantly contributes to improved reversible capacity. Finally, rGO sheets formed on the surface of ZSO@NiO NFs enable to construct electrically conductive path as well as a stable SEI layer, resulting in excellent electrochemical performances. Especially, exceptional cycle lifespan of more than 1600 cycles with a high capacity (1060 mAh g–1) at a high current density (1000 mA g–1), which is the best result among mixed transition metal oxide (stannates, molybdates, cobaltates, ferrites, and manganates) negative electrodes for LIBs, is demonstrated.

Study on the Electrochemical Features of Carbon-Coated GeS2 and GeSe2 Anodes toward Application in Sodium-Ion Battery

“…The profiles of GeS 2 /C and GeSe 2 /C were very similar because of the similar molecular structure of GeS 2 and GeSe 2 and reaction-type anode electrode. The reaction mechanisms of GeS 2 and GeSe 2 were also clarified in recent studies. ,,, According to the reports, the oxidation and reduction peaks beyond 0.6 V are the multi-step conversion reactions and the peaks located between 0 and 0.6 V are the alloying/dealloying reactions between Ge and Na. The detail electrochemical reaction mechanisms of GeS 2 /C and GeSe 2 /C can be written by the following equations (eqs –): With similar reaction mechanisms, the circle area of GeSe 2 /C, however, was larger than that of GeS 2 /C, as shown in panels a and b of Figure .…”

“…The reaction mechanisms of GeS 2 and GeSe 2 were also clarified in recent studies. 25,26,28,29 According to the (2)…”

Nanoscale Phase Engineering in Two-Dimensional Niobium Pentoxide Anodes toward Excellent Electrochemical Lithium Storage

“…The lattice fringes with spacings of 0.355 and 0.367 nm can be assigned to the (103) crystal plane of the M-Nb 2 O 5 phase and the (011) crystal plane of the H-Nb 2 O 5 phase, respectively. The formation of different phases and interfaces provides effective strain relaxation during battery cycling . The characterizations for other calcinate samples are displayed in Figure S7, showing that the samples also keep similar 2D sheetlike morphology with mixed phases.…”

“…This unique structure can not only increase electrode−electrolyte contact but also enhance the Li + diffusion kinetics. 45,46 For quantification of the thickness of different Nb 47 The characterizations for other calcinate samples are displayed in Figure S7, showing that the samples also keep similar 2D sheetlike morphology with mixed phases. In addition, the HRTEM image (Figure 2f) also shows that there is a high concentration of dislocations that seem to accumulate in distinct crystal planes.…”

Effects of Pulverization and Dead Sn Accumulation in SnO2 Nanorods Grown on Carbon Cloth on Their Electrochemical Performances as the Anode in Lithium Ion Batteries

“…Thus, more recently, the ultrafine nanosized SnO 2 materials have been employed in anodes of LIBs to avoid the aggregation of dead Sn. − However, preparing SnO 2 nanoparticles with sizes less than 3 nm in bulk scale is laborious. Moreover, creating physical barriers within the SnO 2 anode to prevent the diffusion of Sn is also an effective strategy to suppress the Sn aggregation, and nanosized carbon materials, ,, metal, and metal oxide , have been used as physical barriers in SnO 2 anodes.…”