Freeze‐Drying‐Assisted Synthesis of Porous SnO2/rGO Xerogels as Anode Materials for Highly Reversible Lithium/Sodium Storage,ChemElectroChem

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Freeze‐Drying‐Assisted Synthesis of Porous SnO2/rGO Xerogels as Anode Materials for Highly Reversible Lithium/Sodium Storage
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-20 , DOI: 10.1002/celc.201800610
Chao Ma _{1,

2} , Jialin Jiang _{1,

2} , Tingting Xu ₂ , Hongmei Ji ₂ , Yang Yang ₂ , Gang Yang _{1,

2}

Affiliation

Three‐dimensional porous SnO₂/rGO xerogels with superior cycling performance in lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs) are fabricated through a freeze‐drying‐assisted method. SnO₂ nanoparticles (5 nm in diameter) are homogeneously attached to the surface of graphene sheets without self‐aggregation. The heterostructured SnO₂/rGO xerogel possesses numerous micron‐sized pores that can efficiently buffer the volumetric change of SnO₂ during the charge/discharge process and provide multidimensional channels, improving the conductivity between active materials and electrolyte. The SnO₂/rGO xerogel exhibits excellent electrochemical performance, both in LIBs and SIBs, owing to its particular porous structure. For LIBs, it delivers a high initial discharge capacity of 1670.5 mAh g⁻¹ in the first cycle and remains at 1139.4 mAh g⁻¹ after 166 cycles at a current density of 0.1 A g⁻¹. The SnO₂/rGO xerogel also delivers a high discharge capacity of 189.4 mAh g⁻¹ without capacity loss over 266 cycles at a current density of 0.5 A g⁻¹ for SIBs. The SnO₂/rGO xerogel can be used as an electrode material in both LIBs and SIBs, and can maintain an excellent rate performance and cyclic performance, owing to the abundant porosity and high conductivity.

中文翻译：

SnO2 / rGO多孔凝胶的冻干合成作为阳极材料，用于高度可逆的锂/钠存储

通过冷冻干燥辅助方法制造了在锂离子电池（LIB）和钠离子电池（SIB）中具有优异循环性能的三维多孔SnO ₂ / rGO干凝胶。SnO ₂纳米颗粒（直径5 nm）均匀地附着在石墨烯片的表面，而不会自聚集。异质结构的SnO ₂ / rGO干凝胶具有许多微米级的孔，可以有效地缓冲充放电过程中SnO ₂的体积变化，并提供多维通道，从而改善了活性物质与电解质之间的电导率。SnO ₂/ rGO干凝胶由于其特殊的多孔结构，在LIB和SIB中均表现出出色的电化学性能。对于LIBS，它提供的1670.5毫安g的高的初始放电容量^-1在1139.4毫安克在第一次循环和遗体^-1在0.1 A g的电流密度166个循环之后^-1。SnO ₂ / rGO干凝胶在SIBs的电流密度为0.5 A g ^-1的情况下，在266个循环中也提供了189.4 mAh g ^-1的高放电容量，而没有容量损失。SnO ₂/ rGO干凝胶可以用作LIB和SIB中的电极材料，并且由于其丰富的孔隙率和高电导率而可以保持出色的倍率性能和循环性能。

更新日期：2018-06-20

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