Realizing high capacitance at high current densities is one of the challenges for battery electrode materials towards practical applications, especially for metal oxide electrode materials. By designing a specific structure that can alleviate volume expansion and accelerate the diffusion of the ions is an effective way to achieve this goal. Herein, a multilayer porous core-shell structured manganese cobalt oxide (MnCo2O4/C) was obtained by using a simple route that combines the hydrothermal method with calcination. The structure is similar to the Russian doll, which is nested by three to four layers of concentric porous shells. The porous multilayer core-shell structures can relieve volume expansion during discharge/charge, and also enable the diffusion path of lithium ions to be reduced. In addition, it can provide a richer active site. When used as an anode material, MnCo2O4/C showed satisfactory electrochemical performance. After 800 cycles at a current density of 1 A g- 1 a specific capacity of 978 mAh g-1 was able to be achieved. Even at a high current density of 10 A g-1, the electrode could still deliver a specific capacity of 251 mAh g-1, which made it more likely for powering large equipment such as electric vehicles.

中文翻译：

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俄罗斯娃娃架构实现了高倍率和长寿命的 MnCo2O4/C-锂电池

在高电流密度下实现高电容是电池电极材料走向实际应用的挑战之一，尤其是金属氧化物电极材料。通过设计可以减轻体积膨胀并加速离子扩散的特定结构是实现这一目标的有效途径。在此，采用水热法与煅烧相结合的简单路线获得了多层多孔核壳结构的锰钴氧化物（MnCo2O4/C）。结构类似于俄罗斯娃娃，由三至四层同心多孔壳嵌套而成。多孔多层核壳结构可以缓解放电/充电过程中的体积膨胀，还可以减少锂离子的扩散路径。此外，它还可以提供更丰富的活动站点。当用作负极材料时，MnCo2O4/C 表现出令人满意的电化学性能。在 1 A g-1 的电流密度下循环 800 次后，能够实现 978 mAh g-1 的比容量。即使在 10 A g-1 的高电流密度下，该电极仍可提供 251 mAh g-1 的比容量，这使其更有可能为电动汽车等大型设备供电。