Optimized sodium ion battery (SIB) carbon anodes with high stability supporting high power densities are a much‐needed material class and therefore intensively researched. The optimum graphitization degree to accommodate sodium ions, while providing high conductivity, as well as the influence of particle size distribution or pore sizes on the performance of carbon anodes, is one of the most discussed topics in this field. While a lot of studies have been published discussing these questions, the convoluted nature of these parameters, originating from material synthesis constraints, usually prevents their independent optimization. Based on Mesoporous N‐doped Carbon Nanospheres (MPNC) as model carbon material systems, the graphitization temperaturefor spherical particles with a monomodal particle size distribution (≈280 nm) and a narrow pore size distribution (≈30 nm) is optimized for faradaic sodium ion storage (plateau capacity) and electrodes with a very high power density of 2680 W kg−1 at 1000 mA g−1 and a remarkable capacity retention over 2000 cycles of 86 %, only losing 0.04 % of its specific capacity per cycle, are demonstrated.

中文翻译：

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介孔氮掺杂碳纳米球作为钠离子电池负极材料，具有高倍率性能和卓越的功率密度


优化的钠离子电池（SIB）碳阳极具有高稳定性，支持高功率密度，是急需的材料类别，因此得到了深入研究。容纳钠离子的最佳石墨化程度，同时提供高电导率，以及粒度分布或孔径对碳阳极性能的影响，是该领域讨论最多的话题之一。虽然已经发表了许多研究来讨论这些问题，但这些参数的复杂性质（源于材料合成限制）通常会妨碍它们的独立优化。基于介孔氮掺杂碳纳米球（MPNC）作为模型碳材料体系，针对法拉第钠离子优化了具有单峰粒径分布（约280 nm）和窄孔径分布（约30 nm）的球形颗粒的石墨化温度存储（平台容量）和电极在 1000 mA g−1 时具有 2680 W kg−1 的极高功率密度，并且在 2000 个循环中具有 86% 的显着容量保持率，每个循环仅损失 0.04% 的比容量。