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Enhanced rate capability of a lithium ion battery anode based on liquid–solid-solution assembly of Fe2O3 on crumpled graphene

机译:基于Fe2O3的液 - 固液组合对皱巴巴的石墨烯的液固 - 固溶液组装提高锂离子电池阳极的速率能力

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We report a liquid–solid-solution assemble strategy to fabricate Fe _(2) O _(3) @graphene (Fe _(2) O _(3) @rGO) composites at the oil/water interface, where the Fe _(2) O _(3) nanoplates with thickness of about 100 nm are anchored on crumpled graphene sheets. The in situ nucleation and growth process can ensure intimate contact between Fe _(2) O _(3) nanoplates and graphene sheets, while the oil shell on Fe _(2) O _(3) can prevent the aggregation of the Fe _(2) O _(3) @rGO composite. The crumpled structure and the relatively thin Fe _(2) O _(3) nanoplates can shorten the electron diffusion path and enhanced the utilization rate of the active material. When used as the anode material, the Fe _(2) O _(3) @rGO anode shows a high reversible capacity of 1160 mA h g ~(?1) at 0.2 A g ~(?1) after 100 cycles, as well as a high cycling stability (101.3% capacity retention after 300 cycles at 1 A g ~(?1) ). Moreover, with ~156 s charging time (at a current density of 12.8 A g ~(?1) ), the anode can deliver a significant capacity of 552 mA h g ~(?1) , indicating its promising application as a high-rate lithium ion battery anode.
机译:我们报告了液体固溶液组装策略,用于制造FE _(2)O _(3)@Graphene(Fe _(2)O _(3)@ Rgo)复合材料在油/水界面,Fe _ (2)厚度为约100nm的O _(3)纳米板锚固在皱巴巴的石墨烯片上。原位成核和生长过程可以确保Fe _(2)O _(3)纳米板和石墨烯片之间的紧密接触,而FE _(2)O _(3)的油壳可以防止FE _的聚合(2)o _(3)@rgo复合材料。弄皱的结构和相对薄的Fe _(2)O _(3)纳米板可以缩短电子扩散路径并提高活性材料的利用率。当用作阳极材料时,Fe _(2)O _(3)@RGO阳极显示在100次循环后的0.2A G〜(α1)的高可逆容量为1160mA Hg〜(α1)作为高循环稳定性(在1A(β1)的300次循环后的101.3%的容量保留)。此外,通过〜156秒的充电时间(在电流密度为12.8Ag〜(α1)),阳极可以提供552 mA Hg〜(?1)的显着容量,表明其有前途的应用作为高速率锂离子电池阳极。

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