α-Fe2O3 nanoparticles anchored on graphene with 3D quasi-laminated architecture: in situ wet chemistry synthesis and enhanced electrochemical performance for lithium ion batteries
α-Fe2O3 nanoparticles anchored on graphene with 3D quasi-laminated architecture: in situ wet chemistry synthesis and enhanced electrochemical performance for lithium ion batteries
复制标题
DOI：
10.1039/c2nj40151g
复制
发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
Guo, Lin
中科院分区：
文献类型：
--
作者：
Chen, Dezhi;Wei, Wei;Guo, Lin
采用简单的原位湿化学方法制备了一种新型的α-Fe 2 O3/石墨烯复合材料。直径约为130 nm的α-Fe 2 O3颗粒均匀地锚定在石墨烯纳米片上，形成3D准层状结构。这种组织良好的柔性结构可以提供足够的空隙空间以促进电解质渗透，减轻α-Fe 2 O3颗粒的体积变化的影响，并避免在锂插入/脱离期间的颗粒-颗粒聚集。此外，石墨烯不仅提高了复合电极的导电性，而且在长期循环期间保持了复合电极的结构完整性。作为锂离子电池的负极材料，α-Fe 2 O3/石墨烯复合电极表现出742 mAh g（-1）的稳定容量，长达50次循环。该合成技术适用于石墨烯基金属氧化物复合材料的实际大规模生产，作为可充电锂离子电池的先进电极材料。
A novel alpha-Fe2O3/graphene composite is prepared by a simple in situ wet chemistry approach. The alpha-Fe2O3 particles with diameter around 130 nm are homogeneously anchored on graphene nanosheets to form a 3D quasi-laminated architecture. Such a well-organized flexible structure can offer sufficient void space to facilitate the electrolyte penetration, alleviate the effect of the volume change of alpha-Fe2O3 particles and avoid particle-particle aggregation during lithium insertion/desertion. In addition, graphene not only improves the electric conductivity of the composite electrode but also maintains the structural integrity of the composite electrode during long-term cycling. As anode material for Li-ion batteries, the alpha-Fe2O3/graphene composite electrode exhibits a stable capacity of 742 mAh g(-1) up to 50 cycles. The synthesis technique is suitable for practical large-scale production of graphene-based metal oxide composites as advanced electrode materials for rechargeable Li-ion batteries.