类石榴状结构的氧化铁基超结构微球材料的合成与储能应用

Synthesis and Energy Storage Application of Pomegranate-like Iron Oxide-based Super-structured Microspheres Materials

目前,科学家们往往采用纳米材料作电极,以提高比表面积、改善其内部结构,从而提高Li+的扩散速度,进而提升电极材料的倍率性能。上述“纳米化”的高度分散型结构的电极的综合性能(充放电性能、倍率特性、体积能量密度等)、制备成本等关键指标实际上并不能得到工业界接受。本文中,介绍了几篇典型的类石榴状结构的氧化铁基超结构微球材料,这种超结构可以看作是以单个氧化铁基复合微球为基本构筑单元,进一步紧密堆积组装,从而形成的三维微米级的块体材料。这种结构可以提高电极材料整体的体积能量密度,抑制电解质与纳米颗粒之间过多的副反应,并减少电解质的消耗。本文探讨了这种独特的结构在电化学储能应用中的独到优势,希望能给相关领域的研发人员带来一定的借鉴。

Currently,scientists often use nanomaterials as electrodes to increase the specific surface area and tune its internal structure,thus the diffusion speed of Li+can be enhanced and the rate capability are improved.The key indicators such as comprehensive performance(charge-discharge performance,rate performance,volume energy density,etc.)and fabrication cost of the above highly dispersed nanosized electrode structures are not actually accepted by the industry.In this paper,several typical iron oxide-based materials with pomegranate-like structure are introduced.This three-dimensional micron-level superstructured bulk materials are formed by closely packing of dispersed iron oxide-based primary composite microspheres as the basic building units.The overall volume energy density of electrode materials can be increased by this way.Meanwhile,excessive side reactions between electrolytes and nanoparticles are inhibited,reducing electrolyte consumption.The advantages of this unique structure in the application of electrochemical energy storage are discussed,hoping to bring some reference to the researchers in related fields.