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Silicon/reduced graphene oxide films as high performance anodes for Li-ion batteries

Researchers from the East China University of Science and Technology, Shanghai have synthesized a flexible freestanding silicon/reduced graphene oxide (Si/rGO) hybrid film anode for Li-ion batteries. The Si/rGO films, when applied as a free-standing LIBs anode, exhibit a high reversible specific capacity of 904 mAh g−1 at 200 mA g−1 (about 2 times higher than theoretical value of graphite anode), and maintain a long cycle life (650 mAh g−1 after 150 cycles).

A full flexible battery assembled based on the flexible film anode and commercial LiCoO2 as a cathode delivered a high specific capacity of 700 and 613 mAh g−1 at 50 mA g−1 after 15 cycles in flat and bent states, respectively.

They attributed the electrochemical performance mainly to the two-dimensional hollow nanostructure of silicon and the strong synergistic effect with rGO.

The researchers first synthesized hollow silicon nanosheets using a simple magnesiothermic reduction strategy. These hybridize with rGO into flexible films in a layer-by-layer assembly process.

A paper on their work in published in the Journal of Power Sources.

Resources

  • Haoxuan Zhang, Shilong Jing, Yanjie Hu, Hao Jiang, Chunzhong Li (2016) “A flexible freestanding Si/rGO hybrid film anode for stable Li-ion batteries,” Journal of Power Sources, Volume 307, Pages 214-219, doi: 10.1016/j.jpowsour.2015.12.107

Comments

HarveyD

Another step towards 3X future batteries?

Brotherkenny4

It looks like the decay in capacity with cycles slows after 15 cycles. 150 cycles is not enough to know that the performance is stable.

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