Abstract Graphene encapsulated Co2GeO4 (CGO) nanoplates are investigated as a potential anode for sodium ion battery applications for the very first time. Herein, we design and synthesize nanoplates like Co2GeO4/graphene (CGO/G) composite to enable efficient sodium storage behavior while retaining the general advantages of nano structures. The complete wrapping of Co2GeO4 (CGO) nanoplates by graphene sheets is clearly evidenced from HRTEM analysis. Our exclusively designed architecture offers the required electronic web for the fast and facile diffusion of electrons and can effectively accommodate the volume changes of electroactive Co2GeO4 (CGO) materials during cycling. As a result, the as prepared Co2GeO4 (CGO) nanoplates with graphene wrapping shows acceptable specific capacity of 319 mAh g-1 at 100 mA g-1 current density after 100 cycles, stable cyclability 84% capacity retention is achieved after 100 cycles and delivers rate capability of 151 mAh g-1 at 1 A g-1.

中文翻译：

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Co2GeO4/石墨烯异质结构作为钠离子电池的潜在负极

摘要 石墨烯封装的 Co2GeO4 (CGO) 纳米板首次被研究作为钠离子电池应用的潜在阳极。在此，我们设计并合成了 Co2GeO4/石墨烯 (CGO/G) 复合材料等纳米板，以实现高效的钠储存行为，同时保留纳米结构的一般优势。HRTEM 分析清楚地证明了石墨烯片对 Co2GeO4 (CGO) 纳米板的完全包裹。我们专门设计的架构为电子的快速和轻松扩散提供了所需的电子网络，并且可以有效地适应循环过程中电活性 Co2GeO4 (CGO) 材料的体积变化。结果，制备的具有石墨烯包裹的 Co2GeO4（CGO）纳米板在 100 次循环后在 100 mA g-1 电流密度下显示出可接受的 319 mAh g-1 比容量，