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Highly uniform Fe3O4 nanoparticle–rGO composites as anode materials for high performance lithium-ion batteries

机译：高度均匀的Fe 3 O 4 纳米颗粒-rGO复合材料作为高性能锂离子电池的负极材料

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Current lithium-ion batteries (LIBs) based on carbonaceous anodes are close to their theoretical performance limits and can hardly meet the demand for high energy applications. Anode materials based on transition metal oxides are promising alternatives to graphite, stemming from their high lithium storage capacity. Among them, iron oxides have the advantages of rich raw materials, low prices, and high theoretical capacities. Herein, we report a facile strategy of improving the capacity and cycling stability of LIBs via the use of reduced graphene oxide-doped Fe3O4 nanoparticles (around 6.45 nm) as anode materials. Galvanostatic cycling measurements show that cells with Fe3O4/rGO nanocomposites deliver a reversible specific capacity of 1108 mA h g?1 at a current density of 0.5 A g?1 even after 400 cycles. The unique structure of Fe3O4/rGO nanocomposites is responsible for the high cycling performance. The rGO component enables high electrical conductivity while the homogeneous distribution of nano-sized Fe3O4 in rGO favors the diffusion and charge transfer of ions. The void space amongst the nanoparticles and the rGO nanosheets can accommodate volume expansion during cycling. This novel tactic can be used in the preparation of other transition metal oxides with ultra-small and uniform nanoparticles such as SnO2, Co2O3, TiO2 and RuO2 for high-energy LIBs.
机译：当前基于碳质阳极的锂离子电池（LIB）接近其理论性能极限，几乎无法满足高能应用的需求。基于锂的高存储容量，基于过渡金属氧化物的阳极材料有望替代石墨。其中，氧化铁具有原料丰富，价格低廉，理论容量高的优点。本文中，我们报告了一种通过使用还原的氧化石墨烯掺杂的Fe 3 O < / em>来提高LIB容量和循环稳定性的简便策略。 small> 4 纳米粒子（约6.45 nm）作为阳极材料。恒电流循环测量表明，具有Fe 3 O 4 / rGO纳米复合材料的细胞可提供1108 mA的可逆比容量hg ？1 的电流密度为0.5 A g ？1 ，即使经过400次循环也是如此。 Fe 3 O 4 / rGO纳米复合材料的独特结构是其高循环性能的原因。 rGO组分可实现高电导率，而rGO有利于纳米尺寸的Fe 3 O 4 的均匀分布离子的扩散和电荷转移。纳米颗粒和rGO纳米片之间的空隙空间可以适应循环过程中的体积膨胀。这种新颖的策略可用于制备具有超小且均匀的纳米粒子的其他过渡金属氧化物，例如SnO 2 ，Co 2 O 3 ，TiO 2 和RuO 2 用于高能LIB。

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