A SnO_x Quantum Dots Embedded Carbon Nanocage Network with Ultrahigh Li Storage Capacity

Abstract

Tin-based materials with high specific capacity have been studied as high-performance anodes for energy storage devices. Herein, a SnO x (x = 0, 1, 2) quantum dots@carbon hybrid is designed and prepared by a binary oxide-induced surface-targeted coating of ZIF-8 followed by pyrolysis approach, in which SnO x quantum dots (under 5 nm) are dispersed uniformly throughout the nitrogen-containing carbon nanocage. Each nanocage is cross-linked to form a highly conductive framework. The resulting SnO x @C hybrid exhibits a large BET surface area of 598 m2 g–1, high electrical conductivity, and excellent ion diffusion rate. When applied to LIBs, the SnO x @C reveals an ultrahigh reversible capacity of 1824 mAh g–1 at a current density of 0.2 A g–1, and superior capacities of 1408 and 850 mAh g–1 even at high rates of 2 and 5 A g–1, respectively. The full cell assembled using LiFePO4 as cathode exhibits the high energy density and power density of 335 Wh kg–1 and 575 W kg–1 at 1 C based on the total active mass of cathode and anode. Combined with in situ XRD analysis, the superior electrochemical performance can be attributed to the SnO x -ZnO-C asynchronous and united lithium storage mechanism, which is formed by the well-designed multifeatured construction composed of SnO x quantum dots, interconnected carbon network, and uniformly dispersed ZnO nanoparticles. Importantly, this designed synthesis can be extended for the fabrication of other electrode materials by simply changing the binary oxide precursor to obtain the desired active component or modulating the type of MOFs coating to achieve high-performance LIBs.

Zn2SiO4@C submicro-ellipsoids assembled from oriented nanorods with outstanding rate performance for Li-ion capacitors

“…Then the nuclei grew to short nanorods and further formed the Zn 2 SiO 4 submicro-ellipsoids by self-assembly in the same direction as the reaction temperature was increased to 200 °C and maintained for 3 h. Through the modification process with polydimethyl diallyl ammonium chloride (PDDA) and poly(styrene sulfonic acid) sodium (PSS), the negatively charged Zn 2 SiO 4 precursor can attract Zn 2+ and react with 2-methylimidazole to generate the uniform ZIF-8 coating layers. 4 During the pyrolysis, the original structure of the submicro-ellipsoids within Zn 2 SiO 4 was preserved very well. The conductive ZIF-8 derived carbon layers were not only coated on the surface of the Zn 2 SiO 4 submicro-ellipsoids, but also permeated into the interior of the Zn 2 SiO 4 submicro-ellipsoids and were coated on the surface of the short nanorods, producing a highly conductive network.…”

“…The high Li + diffusion coefficient of ZSC-2 is also better than that reported by some previous studies (SnO x @C: 4.02 Â 10 À10 ; LVO/GA-2h: 3.15 Â 10 À13 ; cNiCo 2 O 4 : 1 Â 10 À6 to 8 Â 10 À6 ; M-Co 9 S 8 @NCF: 2.48 Â 10 À12 ; KHPC-600: 4.7 Â 10 À11 ). 4,[41][42][43][44] Fig. S8 † provides a comprehensive comparison of the properties of the Zn 2 -SiO 4 @C hybrids, which shows that ZSC-2 possesses the optimal electrochemical performance.…”

“…The tremendous energy demand of new-generation transportation promotes the continuous advancement of fascinating energy storage devices (ESDs). [1][2][3][4][5] Building a bridge between lithium-ion batteries (LIBs) with enhanced capacity and supercapacitors (SCs) with considerable rate capability, lithium-ion capacitors (LICs) provide an enhanced and balanced high energy and power density, and are thus regarded as a potential candidate for next-generation ESDs. [6][7][8] The charge storage mechanism in LICs at the anode is a lithium-ion faradaic reaction process, which is different from the adsorption/ desorption of anion species at the cathode.…”

ZIF-8-Derived Carbon In Situ Modification of High-Content Manganese Oxide for a High-Capacity Lithium-Ion Battery

“…Our previous studies proved that in situ growth and controllable coating of ZIF-8 could be achieved by employing binary oxide (ZnSnO 3 ) as a precursor, to obtain high-performance tin-based nanohybrids. , Inspired by previous work, herein, ZIF-8-derived carbon-coated MnO x particles composed of conductive connection-structured nanohybrid material was designed and prepared through a binary oxide (ZnMn 2 O 4 ) induced ZIF-8 modification followed by a pyrolysis strategy. Cross-linked ZnMn 2 O 4 acts as a bridge for reacting with 2-methylimidazole to realize the in situ growth of ZIF-8 around the ZnMn 2 O 4 precursor.…”

Correction to “A SnOx Quantum Dots Embedded Carbon Nanocage Network with Ultrahigh Li Storage Capacity”

“…The XRD and Raman curves of SQD@C-1 were incorrect. The modified image is shown below, and this change does not alter the results or conclusion of the paper …”