Pomegranate-like porous carbon coated CuxSny/Sn/SnO2 submicrospheres as superior lithium ion battery anode

Abstract

The Cu-Sn alloy compounds have low volume expansion but suffer from poor cycling performance as anode materials for lithium ion batteries (LIBs). In order to improve the electrochemical performance, the pomegranate-like porous carbon coated Cu x Sn y /Sn/SnO 2 submicrospheres assembled by nanoparticles (abbreviated as pomegranate-like Cu x Sn y /Sn/SnO 2 /C submicrospheres) were facilely prepared by in situ polymerization of dopamine (DA) on the surface of CuSn(OH) 6 submicrospheres, followed by carbonization and reduction in H 2 /Ar atmosphere. Based on the advantages of nanometer-sized particle, porous structure and amorphous carbon coated, the as-prepared pomegranate-like Cu x Sn y /Sn/SnO 2 /C submicrospheres behaved excellent cycling and rate performance as anode materials for LIBs. At the current density of 200 mA g-1 , the electrode materials could keep a capacity of 604 mAh g-1 after 150 cycles. Importantly, pomegranate-like Cu x Sn y /Sn/SnO 2 submicrospheres could maintain the initial structure after 150 cycles. Relied on the excellent electrochemical performance, the pomegranate-like Cu x Sn y /Sn/SnO 2 /C submicrospheres were expected to become a promising anode material for LIBs.

A Spinel Tin Ferrite with High Lattice-Oxygen Anchored on Graphene-like Porous Carbon Networks for Lithium-Ion Batteries with Super Cycle Stability and Ultra-fast Rate Performances

“…Figure d shows the C 1s XPS spectrum of SFO@C-IV; other samples are shown in Figure S10. The peaks at 284.80, 286.19, and 288.52 eV are related to C–C, C–O, and CO/O–CO bonds, respectively Figure e and Figure S11a–d show the XPS spectra of Fe 2p of SFO@C-IV and other samples.…”

“…The peaks at 284.80, 286.19, and 288.52 eV are related to C−C, C−O, and CO/ O−CO bonds, respectively. 29 Figure 3e and Figure S11a−d show the XPS spectra of Fe 2p of SFO@C-IV and other samples. There are two main peaks at 711.24 and 724.70 eV assigned to Fe 2p 3/2 and Fe 2p 1/2 , along with two satellite peaks at 718.81 and its matched peak at 733.80 eV, respectively.…”

Traditional Electrodeposition Preparation of Nonstoichiometric Tin-Based Anodes with Superior Lithium-Ion Storage

“…The initial charge and discharge capacities were 590.9 and 811.7 mAh g –1 with the initial coulombic efficiency of 72.8%. The irreversible capacity might be assigned to the formation of an SEI film. , In the first discharge step, three flat plateaus for electrode C at about 0.9, 0.4, and 0.1 V correspond to the formation of an solid electrolyte interface (SEI) film, the consecutive formation of an intermediate phase (Li 2 CuSn), and the alloy reaction (Li 4.4 Sn), respectively, and the voltage platforms at 0.2, 0.5, and 0.9 V of the charge curve are assigned to the dealloying reaction. ,− After the initial capacity decay, the charge/discharge profiles maintain a relatively good agreement. As a comparison, the charge and discharge curves of sample A and sample B at different cycles are shown in Supporting Information (Figures S1 and S2).…”

Fe3C-Functionalized 3D Nitrogen-Doped Porous Graphene Nanocomposites as Anode Materials for Lithium-Ion Batteries

“…Recently, the three-dimensional conductive network structure of porous carbon materials has effectively shortened the transport path of lithium ions and provided a larger surface area for the charge transfer reaction, making them a promising LIB anode material. − However, single porous carbon is still not enough to meets the demands for LIBs for its low theoretical capacity and initial Coulombic efficiency. − Doping heteroatoms, such as N, S, or P, into carbonaceous materials has been recognized to further improve the electrochemical performance of carbon materials. − Pan et al have improved the capacity of carbon nanotubes to 390 mA h g –1 at 1.488 A g – 1 for LIBs by doping N atoms (at 6%) . However, the most common method for doping N in graphene is a top-down method which is hard to achieve a high-nitrogen-doping content for the high chemical stability of carbon sources.…”