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In situ prepared V2O5/graphene hybrid as a superior cathode material for lithium-ion batteries

机译：原位制备的V2O5 /石墨烯杂交作为锂离子电池的优良阴极材料

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摘要

Developing synthetic methods for graphene based cathode materials, with low cost and in an environmentally friendly way, is necessary for industrial production. Although the precursor of graphene is abundant on the earth, the most common precursor of graphene is graphene oxide (GO), and it needs many steps and reagents for transformation to graphite. The traditional approach for the synthesis of GO needs many chemicals, thus leading to a high cost for production and potentially great amounts of damage to the environment. In this study, we develop a simple wet ball-milling method to construct a V _(2) O _(5) /graphene hybrid structure in which nanometre-sized V _(2) O _(5) particles/aggregates are well embedded and uniformly dispersed into the crumpled and flexible graphene sheets generated by in situ conversion of bulk graphite. The combination of V _(2) O _(5) nanoparticles/aggregates and in situ graphene leads the hybrid to exhibit a markedly enhanced discharge capacity, excellent rate capability, and good cycling stability. This study suggests that nanostructured metal oxide electrodes integrated with graphene can address the poor cycling issues of electrode materials that suffer from low electronic and ionic conductivities. This simple wet ball-milling method can potentially be used to prepare various graphene based hybrid electrodes for large scale energy storage applications.
机译：为工业生产开发基于石墨烯的阴极材料的合成方法，具有低成本和环境友好的方式。虽然石墨烯的前​​体在地球上丰富，但石墨烯最常见的前体是石墨烯氧化物（GO），并且需要许多步骤和试剂用于转化为石墨。传统的合成方法的方法需要许多化学品，从而导致生产成本高，对环境造成的损害很大。在这项研究中，我们开发了一种简单的湿球磨方法，构建V _（2）O _（5）/石墨烯混合结构，其中纳米大小的V _（2）O _（5）颗粒/聚集体很好嵌入并均匀地分散到通过原位转化的散装石墨而产生的褶皱和柔性石墨烯片。 V _（2）O _（5）纳米颗粒/聚集体和原位石墨烯的组合引发了杂交物，表现出显着提高的放电容量，优异的速率能力和良好的循环稳定性。该研究表明，与石墨烯集成的纳米结构金属氧化物电极可以解决患有低电子和离子电导率的电极材料的差的循环问题。这种简单的湿球铣削方法可以用于制备用于大规模能量存储应用的各种石墨烯的混合电极。

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