Recently, CoCO3 has attracted enormous attention as anodes for lithium-ion batteries (LIBs), benefiting from its high theoretical capacity and simple synthesis. However, the modest electronic conductivity and structural instability over cycling hinder its wider applications. To well address the intrinsic issues, we explored a precipitant-free hydrothermal methodology for mass production of spindle-like CoCO3/reduced graphene oxide (S-CoCO3/rGO) toward advanced LIBs as a hybrid anode. The dimethylformamide plays a significant role of “two birds (i.e., solvent and precipitant) with one stone” in the formation of the S-CoCO3/rGO, greatly improving its practical applicability. The purposeful introduction of rGO nanosheets as a two-dimensional flexible conductive network enhances the conductivity and stability of the S-CoCO3. It is the structural and compositional merits for LIBs that endow the S-CoCO3/rGO with remarkable lithium-storage performance in terms of enhanced interfacial storage capacity, high-rate reversible capacities (803 mAh·g−1 at 2.0 A·g−1) and long-duration capacity retention of 82.1% over 2000 consecutive cycles at 2.0 A·g−1. More significantly, the simple yet efficient avenue here promises enormous commercial prospect of the S-CoCO3/rGO in next-generation LIBs.

中文翻译：

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纺锤状CoCO3/还原氧化石墨烯混合阳极的无沉淀溶剂热结构构建高性能锂离子电池

最近，CoCO3 作为锂离子电池（LIBs）的负极，因其高理论容量和简单的合成而备受关注。然而，循环过程中适度的电子导电性和结构不稳定性阻碍了其更广泛的应用。为了很好地解决内在问题，我们探索了一种无沉淀剂的水热方法，用于大规模生产纺锤状 CoCO3/还原氧化石墨烯（S-CoCO3/rGO），并将其用作高级 LIBs 作为混合阳极。二甲基甲酰胺在S-CoCO3/rGO的形成过程中起到了“一石两鸟”的作用，大大提高了其实际适用性。有目的地引入 rGO 纳米片作为二维柔性导电网络增强了 S-CoCO3 的导电性和稳定性。LIBs 的结构和组成优势赋予 S-CoCO3/rGO 在增强的界面存储容量、高倍率可逆容量（803 mAh·g-1 at 2.0 A·g-1 ) 和在 2.0 A·g-1 下连续 2000 次循环的长期容量保持率为 82.1%。更重要的是，这里简单而高效的途径为 S-CoCO3/rGO 在下一代 LIB 中的巨大商业前景提供了可能。