High Coulomb Efficiency Sn–Co Alloy/rGO Composite Anode Material for Li–ion Battery with Long Cycle–Life

Abstract

The low cycle performance and low Coulomb efficiency of tin-based materials confine their large–scale commercial application for lithium–ion batteries. To overcome the shortage of volume expansion of pristine tin, Sn–Co alloy/rGO composites have been successfully synthesized by chemical reduction and sintering methods. The effects of sintering temperature on the composition, structure and electrochemical properties of Sn–Co alloy/rGO composites were investigated by experimental study and first-principles calculation. The results show that Sn–Co alloys are composed of a large number of CoSn and trace CoSn2 intermetallics, which are uniformly anchored on graphene nanosheets. The sintering treatment effectively improves the electrochemical performance, especially for the first Coulomb efficiency. The first charge capacity of Sn–Co alloy/rGO composites sintered at 450 °C is 675 mAh·g−1, and the corresponding Coulomb efficiency reaches 80.4%. This strategy provides a convenient approach to synthesizing tin-based materials for high-performance lithium–ion batteries.

Design and Performance of a New Zn0.5Mg0.5FeMnO4 Porous Spinel as Anode Material for Li-Ion Batteries

“…Recently, the extensive demand for consumer electronics and electric vehicles has led to a significant increase in the demand for rechargeable lithium-ion batteries (LIBs) owing to their high energy density, long cycle life, environmental friendliness, and no memory effect [1][2][3]. Since the 1990s, LIBs have been regarded as one of the systems with the most energy storage and have gained widespread applications in mobile electronic devices such as handheld computers, tablets, and mobile phones.…”

GeO2 Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode

“…Briefly, many transition metal elements are regarded as inactive, while their oxides, such as Fe 2 O 3 , MnO, NiO and CoO [ 9 , 10 , 11 , 12 , 13 ], are active and can reversibly react with lithium at a relatively high potential (the corresponding conversion reaction equation is MO + Li ↔ M + Li 2 O, where M represents transition metal). In addition, some group 3 elements (Ga, In) [ 14 , 15 ], group 4 elements (Si, Ge, Sn) [ 16 , 17 , 18 ] and group 5 elements (Sb, Bi) [ 19 , 20 , 21 ] can form alloys with lithium at relatively low potentials (the corresponding alloying equation is N + Li ↔ NLi, where N presents transition group 3, 4 and 5 elements) [ 22 , 23 ]. However, the lithium storage mechanism of group 3–5 element-based oxides is rather complicated, and the related electrochemical reaction consists of alloying and conversion reaction processes [ 24 , 25 , 26 , 27 ].…”

Exploring the Potential of Ag1–xNix/RGO Nanocomposites for Spintronic Application

“…On the other hand, the charge transfer effect at the graphene/transition metal interface has been reported by researchers. , Alloy nanoparticles (NPs) decorated with RGO have attracted attention due to their excellent catalyst, optical, electronic, and magnetic properties. For instance, Sn–Co alloy/RGO, Cu x Ni 1– x /RGO, Ru x Pd y @RGO, PdNi/RGO/EVA, and NiPt/RGO nanocomposites have shown their great importance in the field of Li-ion batteries, catalysis, EMI shielding, and interface applications. − The phase diagram of a Ag–Ni system demonstrates the immiscibility of these two metals and does not tend to form any solid solution . The thermodynamically assessed Ag–Ni system showed 1% mutual solid solubility.…”