Synthesis of Nanostructured SnO₂/C Microfibers with Improved Performances as Anode Material for Li-Ion Batteries

Abstract

Nanostructured SnO2/C microfibers were prepared by thermal decomposition of tin alginate fibers produced via wet-spinning technique. Results of X-ray diffraction and scanning electron microscopy show that the as-obtained SnO2/C microfibers consist of nano-sized SnO2 crystals with a mean diameter of 10-15 nm. Transmission electron microscopy visualization reveals that the composite fibers exhibit a porous structure consisting of both micropores and mesopores. Electrochemical evaluations of cyclic voltammetry and galvanostatic charge-discharge indicate that the SnO2/C microfibers possess a high capacity and good rate capability compared with commercial SnO2. The improved performances of SnO2/C fibers can be attributed to the nano-size of SnO2 particles dispersed in carbon matrix and the existing nanopores in the SnO2/C microfibers.

Metal Oxides and Oxysalts as Anode Materials for Li Ion Batteries

“…They reported reversible capacities in the range 602–632 mA·h g –1 , cycled in the voltage range 0.005–1.0 V and at a current rate of 100 mA g –1 (Table ). Heat-treated sample at 500 °C retained a capacity of 480 mA·h g –1 at the end of the 50th cycle, and they proposed an electrochemical alloying/dealloying reaction mechanism (voltage range 0.005–1.0 V) that was similar to previous original work by the group of Dahn and Retoux et al Results from the recent studies on the Li cycling of nanostructured SnO 2 , carbon, CNT, and graphene composites − and capacity values of a few slected references are summarized in Table .…”

Synthesis and electrochemical performance of nanocrystalline Al0.4Mg0.2Sn0.4O1.6 and Al0.25Mg0.38Sn0.38O1.5 investigated by in situ XRD, 27Al/119Sn MAS NMR, 119Sn Mössbauer spectroscopy, and galvanostatic cycling

“…Furthermore, these quaternary compounds exhibit a better cycling performance compared to a number of carbon coated tin dioxides. [60][61][62] This fact shows that the extremely small crystallite sizes are benecial. were synthesized with a very small particle size of around 4 nm by a co-precipitation method.…”

Sn-encapsulated N-doped porous carbon fibers for enhancing lithium-ion battery performance

“…[9][10][11] To address this drawback, two strategies have been proposed: one is to prepare small-sized Sn particles to reduce the absolute volume; [12][13][14] and the other is to design a hollow structure in electrodes to provide the space for volume expansion. [15][16][17][18] For example, some core/shell, yolk-shell, and multilayer structure Sn/carbon materials have been reported. [19][20][21][22] Nevertheless, when they are used as electrode materials, it is oen necessary to add binders and conductors to improve the electron transport ability, even though they make no contribution to the improvement of capacity.…”