Synthesis of snowflake-shaped Co3O4 with a high aspect ratio as a high capacity anode material for lithium ion batteries

Wang, Bin2; Lu, Xiao-Ying1; Tang, Yuanyuan3

2015

10.1039/c5ta00140d

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

In this study, snowflake-shaped Co3O4 nanosheets (Co3O4-SF) are successfully fabricated by a facile ammonia-assisted hydrothermal route followed by calcination at 450 degrees C. Material characterizations indicate that the as-prepared Co3O4-SF shows an ultrathin structure with 10 mu m width and 100 nm thickness, suggesting micro-/nanostructures and a high aspect ratio of 100. Reactant concentration and reaction duration are considered as important synthesis parameters for snowflake-shaped Co3O4 fabrication. It is also found that ammonia plays critical roles in the formation of the snowflake structure. By simply manipulating the ammonia amount, the material structure can be easily changed to hexagonal nanosheets (Co3O4-HX). More importantly, when Co3O4 anodes with these two interesting structures are evaluated in a coin cell, the snowflake-shaped Co3O4 electrode delivers remarkable capacities (1044 mA h g(-1) at 500 mA g(-1)) with better retention (86-98% at 500-1000 mA g(-1)) after 100 cycles and excellent rate performance (977 mA h g(-1) at 3000 mA g(-1)) at various current densities. Due to the unique structure and properties, snowflake-shaped Co3O4 anodes with superior battery performance demonstrate great potential in lithium ion batteries.

SCI ; EI

英语

其他

Technological and Higher Education Institute of Hong Kong Seed Grant Scheme[1415103] ; Technological and Higher Education Institute of Hong Kong Seed Grant Scheme[14151112]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000353927500044

ROYAL SOC CHEMISTRY

20151900825393

Ammonia ; Anodes ; Aspect ratio ; Nanosheets ; Snow

Precipitation:443.3 ; Electron Tubes:714.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Solid State Physics:933

Web of Science

1.Technol & Higher Educ Inst Hong Kong, Fac Sci & Technol, Hong Kong, Hong Kong, Peoples R China
2.Hong Kong Appl Sci & Technol Res Inst Co Ltd, Green Energy, Hong Kong, Hong Kong, Peoples R China
3.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen, Peoples R China

Wang, Bin,Lu, Xiao-Ying,Tang, Yuanyuan. Synthesis of snowflake-shaped Co3O4 with a high aspect ratio as a high capacity anode material for lithium ion batteries[J]. Journal of Materials Chemistry A,2015,3(18):9689-9699.

Wang, Bin,Lu, Xiao-Ying,&Tang, Yuanyuan.(2015).Synthesis of snowflake-shaped Co3O4 with a high aspect ratio as a high capacity anode material for lithium ion batteries.Journal of Materials Chemistry A,3(18),9689-9699.

Wang, Bin,et al."Synthesis of snowflake-shaped Co3O4 with a high aspect ratio as a high capacity anode material for lithium ion batteries".Journal of Materials Chemistry A 3.18(2015):9689-9699.