Transition metal oxides gain considerable research attentions as potential anode materials for lithium ion batteries, but their applications are hindered due to their poor electronic conductivity, weak cycle stability and drastic volume change. Here, a NiO@graphene composite with a unique 3D conductive network structure is prepared through a simple strategy. When applied as anode material for Li-ion batteries, at 50 mA g⁻¹, the NiO@graphene displays a high reversible capacity of 1366 mAh g⁻¹ and a stable cyclability of 205 mAh g⁻¹ after 500 cycles. Even at a high rate of 10 A g⁻¹, it displays a favorable reversible capacity of 711 mAh g⁻¹. Remarkably, when it recovers back to 0.05 A g⁻¹, a reversible capacity of 1741 mAh g⁻¹ is achieved. Thus, the NiO@graphene composite with 3D structure shows good application prospects as an alternative anode for advanced lithium ion batteries.

过渡金属氧化物作为锂离子电池的潜在负极材料受到了广泛的研究关注，但由于其电子导电性差、循环稳定性差和体积变化剧烈，其应用受到阻碍。在这里，通过简单的策略制备了具有独特 3D 导电网络结构的 NiO@graphene 复合材料。当用作锂离子电池的负极材料时，在 50 mA g ^{-1 时}，NiO@石墨烯在 500 次循环后显示出 1366 mAh g ^-1的高可逆容量和 205 mAh g ^-1的稳定循环能力。即使在10 A g ^-1的高倍率下，它也显示出711 mAh g ^-1的良好可逆容量。值得注意的是，当它恢复到 0.05 A g ^-1，实现了1741 mAh g ^-1的可逆容量。因此，具有 3D 结构的 NiO@graphene 复合材料作为先进锂离子电池的替代负极显示出良好的应用前景。