Quantifying Sodiation Kinetics in Alloying Tin Electrodes for Sodium-Ion Batteries
Quantifying Sodiation Kinetics in Alloying Tin Electrodes for Sodium-Ion Batteries
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DOI：
10.1149/1945-7111/ac2708
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发表时间：
2021-09
影响因子：
3.9
通讯作者：
S. Sarkar;A. Verma;P. Mukherjee
中科院分区：
文献类型：
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作者：
S. Sarkar;A. Verma;P. Mukherjee
钠离子电池（SIB）是有前途的下一代能量存储设备，因为元素丰富和低钠成本。然而，由于固有的电极材料和电解质相互作用，SIB的较低的存储容量和较短的寿命需要对钠化/脱钠动力学络合的基本理解。本研究全面研究了锡（Sn）电极，一个有前途的阳极，依靠基于GITT（恒电流间歇滴定技术）分析的钠合金化和去合金化机制的动力学。这项研究包括一个有限的组合分析的钠盐，即NaPF 6和NaClO 4，结合不同的碳酸盐溶剂。这一全面的分析eleconize的盐/溶剂组合的扩散性，电荷转移电阻，嵌入速率常数，和交换电流密度的比较范例。总的来说，NaClO 4表现出更好的动力学和传输性能相比，NaPF 6。本研究进一步阐明了由于添加剂过量的氟贡献，离子迁移率和反应速率随界面钝化的变化。活性颗粒尺寸的影响表明，纳米颗粒表现出减少的电化学（充电/放电）滞后比微粒。总的来说，这项研究表明了更可观的电荷转移电阻，交换电流密度，和反应速率常数的扩散率相比的灵敏度。
Sodium-ion batteries (SIBs) are promising next-generation energy storage devices because of the elemental abundance and low sodium cost. However, the lower storage capacity and short lifespan of SIBs necessitate the need for a fundamental understanding of the sodiation/de-sodiation kinetics complexation due to the inherent electrode materials and electrolyte interactions. This study comprehensively studied the kinetics of the sodium alloying and de-alloying mechanism in tin (Sn) electrodes, a promising anode, relying on GITT-based (galvanostatic intermittent titration technique) analytics. This study includes a limited combinatorial analysis of sodium salts, namely, NaPF 6 and NaClO 4, in conjunction with different carbonate solvents. This comprehensive analysis elicits a comparative paradigm of diffusivity, charge transfer resistance, intercalation rate constant, and exchange current density for the salt/solvent combinations. Overall, NaClO 4 exhibits better kinetic and transport properties as compared to NaPF 6. This study further elucidates the variation of ionic mobility and reaction rate with interfacial passivation due to excess fluorine donation from additives. The effect of active particle size reveals that nanoparticles exhibit reduced electrochemical (charge/discharge) hysteresis than microparticles. Overall, this study demonstrates a more considerable sensitivity of the charge transfer resistance, exchange current density, and reaction rate constants compared to the diffusivity.