Sodium‐ion batteries have recently attracted intensive attention due to their natural abundance and low cost. Antimony is a desirable candidate for an anode material for sodium‐ion batteries due to its high theoretical capacity (660 mA h g⁻¹). However, the utilization of alloy‐based anodes is still limited by their inherent huge volume changes and sluggish kinetics. The Sb‐embedded silicon oxycarbide (SiOC) composites are simply synthesized via a one‐pot pyrolysis process at 900 °C without any additives or surfactants, taking advantage of the superior self‐dispersion properties of antimony acetate powders in silicone oil. The structural and morphological characterizations confirm that Sb nanoparticles are homogeneously embedded into the amorphous SiOC matrix. The composite materials exhibit an initial desodiation capacity of around 510 mA h g⁻¹ and maintained an excellent capacity retention above 97% after 250 cycles. The rate capability test reveals that the composites deliver capacity greater than 453 mA h g⁻¹, even at the high current density of 20 C rate, owing to the free‐carbon domain of SiOC material. The electrochemical and postmortem analyses confirm that the SiOC matrix with a uniform distribution of Sb nanoparticles provides the mechanical strength without degradation in conductive characteristics, suppressing the agglomeration of Sb particles during the electrochemical reaction.

中文翻译：

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用于高性能钠离子电池的锑嵌入碳化硅材料的一锅法合成

钠离子电池由于其天然的丰富性和低成本最近受到了广泛的关注。锑是钠离子电池负极材料的理想候选材料，因为它具有很高的理论容量（660 mA hg ^-1）。但是，基于合金的阳极的使用仍然受到其固有的巨大体积变化和缓慢的动力学的限制。利用乙酸锑粉末在硅油中的超强自分散性能，可以在900°C下通过单锅热解工艺简单地合成嵌入Sb的碳氧化硅（SiOC）复合材料。结构和形态特征证实Sb纳米颗粒均匀地嵌入非晶SiOC基质中。该复合材料表现出约510mA hg ^-1的初始消沉容量，并且在250次循环后保持优异的容量保持率高于97％。速率能力测试表明，复合材料的输送能力大于453 mA hg ^-1由于SiOC材料的自由碳域，即使在20 C的高电流密度下也是如此。电化学和验尸分析证实，具有均匀分布的Sb纳米颗粒的SiOC基质可提供机械强度而不会降低导电性能，从而抑制了Sb颗粒在电化学反应过程中的团聚。