Preparation of SnO₂-Nanocrystal/Graphene-Nanosheets Composites and Their Lithium Storage Ability

Abstract

To improve the performance of SnO 2 as anode materials for lithium battery, a facile and efficient method to prepare the composites of SnO 2 -nanocrystal/graphene-nanosheets was developed on the basis of the reduction of graphene oxide (GO) by Sn 2+ ion. Changing the ratio of Sn 2+ and GO led to the morphology changes of SnO 2 /graphene-nanosheets composite. The performance as anode materials for lithium battery was studied in this report. The results showed that the electrochemical performance of composites was greatly enhanced, indicating that the composites might have a promising future as application in Li-ion battery.

High reversible capacity of SnO2/graphene nanocomposite as an anode material for lithium-ion batteries

“…The initial coulombic efficiency of the SnO 2 /graphene is 59%, but it is above 94% after 5 cycles. The large irreversible capacity during the first cycle can be attributed to irreversible lithium loss due to the formation of thick solid-electrolyte interface (SEI) layer on the electrode surface [5,17,35], and the fact that some Sn(0) cannot be re-oxidized back to Sn(IV) [9,19]. Table 1 shows a comparison of the reversible specific capacity at a low current density between the SnO 2 /graphene nanocomposites reported before and in this work.…”

“…Such excellent rate capability should be attributed to the highly conducting 3D graphene electronic conductive network and porous structure of the SnO 2 /graphene nanocomposite. The highly conducting 3D graphene electronic conductive network could increase electronic conductivity of the nanocomposite and the porous structure can facilitate liquid electrolyte diffusion into the bulk materials [7,30,34,35,41]. In addition, the shorten path length for Li + transport due to nanosized SnO 2 particles in as-prepared SnO 2 /graphene nanocomposite can also favor the high rate capability [7,41].…”

“…Therefore, graphene is an ideal carbon nanostructure which can be used to design high performance SnO 2 /carbon nanocomposite electrodes. So far, there have been a few reports about the preparation of SnO 2 /graphene nanocomposite [30][31][32][33][34][35][36] [38] developed the gas-liquid interfacial synthesis approach and prepared Fe 3 O 4 /graphene nanocomposite. The Fe 3 O 4 /graphene nanocomposite prepared by the gas-liquid interfacial synthesis approach exhibited a very high reversible capacity.…”

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

“…Alongside with the fi rst examples of Si-containing graphene composites, [ 38,41,52,118 ] few other electrochemical studies on graphene/Li 4 Ti 5 O 12 (i.e., RGO/LTO) hybrid [ 119 ] (where graphene was only used as conductive matrix, similarly to the graphene/TiO 2 composites previously mentioned), and graphene-containing composites (i.e., RGO/nitridated-TiO 2 , [ 120 ] RGO/SnO 2 , [ 49,50,121,122 ] arc-discharged graphene/SnO 2 [ 123 ] and RGO/SnSb, [ 124 ] hybrids) were performed in this period (Table 2 ). Unfortunately, except for the RGO/LTO hybrid [ 119 ] which showed an excellent stability at high current for more than 1300 cycles (maybe also due to the minimal RGO content, i.e., 1 wt%), none of the proposed systems overcame the previously mentioned drawbacks of graphene.…”

Nitrogen doped Graphene Nickel Ferrite Magnetic Photocatalyst for the Visible Light Degradation of Methylene Blue

“…[1][2][3][4][5][6][7] Graphene has attracted the attention due to various applications. [8][9][10][11] Graphene has sp 2 hybridized carbon and one atom thick (2-D) sheet of conjugated system and extraordinary physical and chemical properties. [12][13][14][15][16] There has been so much focus to develop graphene-metal oxide photocatalysts such as TiO 2 -graphene and ZnOgraphene for the photodegradation of organic dye by the irradiation of visible light.…”