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A stable TiO2–graphene nanocomposite anode with high rate capability for lithium-ion batteries

机译：锂离子电池具有高速率能力的稳定TiO2-石墨烯纳米复合阳极

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摘要

A rapid microwave hydrothermal process is adopted for the synthesis of titanium dioxide and reduced graphene oxide nanocomposites as high-performance anode materials for Li-ion batteries. With the assistance of hydrazine hydrate as a reducing agent, graphene oxide was reduced while TiO _(2) nanoparticles were grown in situ on the nanosheets to obtain the nanocomposite material. The morphology of the nanocomposite obtained consisted of TiO _(2) particles with a size of ～100 nm, uniformly distributed on the reduced graphene oxide nanosheets. The as-prepared TiO _(2) –graphene nanocomposite was able to deliver a capacity of 250 mA h g ~(?1) ± 5% at 0.2C for more than 200 cycles with remarkably stable cycle life during the Li ~(+) insertion/extraction process. In terms of high rate capability performance, the nanocomposite delivered discharge capacity of ca. 100 mA h g ~(?1) with >99% coulombic efficiency at C-rates of up to 20C. The enhanced electrochemical performance of the material in terms of high rate capability and cycling stability indicates that the as-developed TiO _(2) –rGO nanocomposites are promising electrode materials for future Li-ion batteries.
机译：采用了一种快速微波水热法用于合成二氧化钛和将石墨烯氧化物纳米复合材料作为锂离子电池的高性能阳极材料的合成。随着肼水合物作为还原剂的辅助，将石墨烯氧化物降低，而TiO _（2）纳米颗粒在纳米片上生长以获得纳米复合材料。得到的纳米复合材料的形态由尺寸为〜100nm的TiO _（2）颗粒，均匀地分布在还原的石墨烯氧化物纳米晶片上。制备的TiO _（2）-Graphene纳米复合物能够在0.2℃下以0.2℃的容量在0.2℃下递送250mA Hg〜（α1）±5％，在Li〜（+）期间具有显着稳定的循环寿命。插入/提取过程。就高速率能力性能而言，纳米复合材料提供了CA的放电容量。 100 mA H g〜（α1）> C-rates的CULOMBIC效率高达20℃。在高速率能力和循环稳定性方面，材料的增强电化学性能表明，AS开发的TiO _（2）-RGO纳米复合材料是未来锂离子电池的电极材料。

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