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Blocky Sb/C Anodes with Enhanced Diffusion Kinetics for High-Rate and Ultra-Long Cyclability Sodium Dual-Ion Batteries
ChemElectroChem ( IF 4 ) Pub Date : 2021-07-23 , DOI: 10.1002/celc.202100769
Hong‐Ji Li 1 , Jing‐Jing Li 1 , Zhe Chen 1 , Zhen‐Zhen Wang 2 , Jin Qu 2 , Yi‐Qian Chen 3 , Li‐Jun Zhu 4 , Fei Jiang 4
Affiliation  

Sodium ion-based dual ion batteries (SDIBs) have attracted increasing attentions for their high operative voltages and low cost, but their poor long-term cycling stability and rate capability largely hinder their practical applications. Here, an optimized anode-antimony/carbon/graphene (Sb/C/G) composite for SDIBs is designed. Sb nanoparticles (NPs) not only can enhance the specific capacity but also facilitate the Na+ diffusion kinetics. The continuous conductive carbon matrix can promote the electron transfer process and accommodate volume changes of Sb NPs during sodiation/desodiation. Therefore, superior electrochemical performance, for example, a high discharge capacity of 376 mA h g−1 with a higher ICE (69.1 %) at current density of 500 mA g−1, an excellent cycling stability (73 mA h g−1 is retained even after 1400 cycles at current density of 1000 mA g−1), and high stable CE of 99.0 %. Our study offers a suitable design for Na+-based batteries anode structure and accelerates their practical applications.

中文翻译:

具有增强扩散动力学的块状 Sb/C 阳极,用于高速和超长循环钠双离子电池

基于钠离子的双离子电池(SDIBs)因其高工作电压和低成本而受到越来越多的关注,但其长期循环稳定性和倍率能力差在很大程度上阻碍了其实际应用。在这里,设计了一种用于 SDIB 的优化阳极-锑/碳/石墨烯(Sb/C/G)复合材料。Sb 纳米粒子 (NPs) 不仅可以提高比容量,还可以促进 Na +扩散动力学。连续的导电碳基体可以促进电子转移过程并适应钠化/脱钠过程中 Sb NPs 的体积变化。因此,优异的电化学性能,例如在 500 mA h g -1 的电流密度下具有376 mA h g -1的高放电容量和更高的 ICE (69.1 %),优异的循环稳定性(73毫安ħ克-1是在千毫安克电流密度保持即使经过1400次循环-1,和99.0%的高稳定CE)。我们的研究为基于Na +的电池负极结构提供了合适的设计,并加速了它们的实际应用。
更新日期:2021-09-13
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