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High-performance mesoporous gamma-Fe2O3 sphere/graphene aerogel composites towards enhanced lithium storage

机译：高性能中孔Gamma-Fe2O3球/石墨烯气凝胶复合材料朝向增强型锂储存

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摘要

Transition metal oxides have recently been demonstrated as highly attractive anodes for high-capacity lithium ion batteries, whose electrochemical properties could be further improved through rational architecture design and incorporating reliable conductive network. Herein, mesoporous gamma-Fe2O3 spheres/graphene aerogel composites were synthesized via a solvothermal pathway followed by suitable annealing. Experimental results reveal the uniform mesoporous structure and well-dispersed gamma-Fe2O3 spheres with the size of 300-400 nm embedded in the mesopores of the graphene aerogel network. Compared with alpha-Fe2O3/graphene aerogel and pure gamma-Fe2O3, the as-synthesized composite delivers, at the first cycle, a high discharging capacity of 1080 mAh g(-1) at current density of 200 mA g(-1). Even at much higher current density of 8000 mA g(-1), satisfactory discharging capacities of 421.5 mAh g(-1) can still be achieved. Upon 100 charging-discharging cycles, the specific capacity of as high as 890.5 mAh g(-1) at 200 mA g(-1) is maintained. The enhanced electrochemical properties could be attributed to their favorable three-dimensional graphene aerogel network, which accounts for the improved structural stability and electronic conductivity of gamma-Fe2O3 during the lithiation/delithiation process.
机译：最近已被证明过渡金属氧化物作为高容量锂离子电池的高度吸引力的阳极，其电化学特性通过理性架构设计可以进一步改善，并包含可靠的导电网络。在此，通过溶剂热途径合成介孔γ-Fe2O3球体/石墨烯气体复合材料，然后合适的退火合成。实验结果揭示了均匀的中孔结构和分散的γ-Fe2O3球体，其尺寸为300-400nm，嵌入石墨烯气凝胶网络的中孔中。与α-Fe2O3 /石墨烯气凝胶和纯γ-Fe2O3相比，在第一个循环中提供的AS合成的复合材料在电流密度为200mA g（-1）时提供高放电容量为1080mAhg（-1）。甚至在8000 mA g（-1）的电流密度高度，仍然可以实现421.5mahg（-1）的令人满意的放电容量。在100个充电排出循环上，维持在200mA G（-1）的高达890.5mAhg（-1）的比容量。增强的电化学特性可归因于其有利的三维石墨烯气凝胶网络，其考虑了锂化/脱水过程中γ-Fe2O3的改进的结构稳定性和电子电导率。

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