As the anode of sodium-ion batteries (SIBs), SnO2 has been attracted considerable attention due to its high theoretical specific capacity. However, these shortcomings of SnO2 anode seriously restrict its practical use for high-performance SIBs due to its poor conductivity, volume expansion and agglomeration of the active material during cycling. In this paper, carbon aerogel (CA) is a three-dimensional porous material with glucose as carbon source and freeze-dried hydrogel method is used to retain three-dimensional network structure by calcination. SnO2 is prepared by hydrothermal method with nanoparticles and distributed on the CA homogeneously to prepare CA/SnO2. The CA/SnO2 is prepared for SIB, in which CA can alleviate the problem of volume expansion and improve poor conductivity of SnO2 as a good carrier. Moreover, the porous structure of CA is beneficial to increase the contact between the electrolyte and the electrode, and accelerates the transmission speed of ions and electrons. Nano-sized SnO2 also contributes to cycle stability. The CA/SnO2 exhibits superior electrochemical performance and maintains a reversible discharge specific capacity of 235[Formula: see text]mAh[Formula: see text]g[Formula: see text] at a current density of 50[Formula: see text]mA[Formula: see text]g[Formula: see text] after 100 cycles.

中文翻译：

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碳气凝胶/SnO2 作为钠离子电池的先进负极

作为钠离子电池 (SIB) 的负极，SnO2因其具有较高的理论比容量而备受关注。然而，SnO 的这些缺点2由于其导电性差、体积膨胀和循环过程中活性材料的团聚，负极严重限制了其在高性能 SIB 中的实际应用。本文研究的碳气凝胶（CA）是以葡萄糖为碳源的三维多孔材料，采用冻干水凝胶法通过煅烧保留三维网络结构。二氧化锡2采用水热法制备纳米颗粒并均匀分布在CA上制备CA/SnO2. CA/SnO2为SIB制备，CA可以缓解体积膨胀问题，改善SnO导电性差的问题2作为一个很好的载体。此外，CA的多孔结构有利于增加电解质与电极的接触，加快离子和电子的传输速度。纳米级二氧化锡2也有助于循环稳定性。CA/SnO2在电流密度为 50[公式：见文本]mA[公式：见文本]g[公式：见文本] 100 次循环后。