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首页> 外文会议>ACS National Meeting Exposition >INVESTIGATIONS OF SOLID ELECTROLYTE INTERHPASE FORMATION ON HIGH-CAPACITY Li- ION BATTERY ANODES
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INVESTIGATIONS OF SOLID ELECTROLYTE INTERHPASE FORMATION ON HIGH-CAPACITY Li- ION BATTERY ANODES

机译：高容量锂离子电池阳极上固体电解质互联蛋白渗透的研究

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Although ubiquitous in consumer electronics, Li-ion batteries can be improved on many levels. Through this work, we aim to understand and control the formation of the solid electrolyte interphase (SEI) between high capacity anodes and non-aqueous battery electrolytes. Additives are routinely used to enhance the cycle life and coulombic efficiency of high capacity anodes (silicon, tin, and lithium, for example), with little understanding of the mechanism underlying the improvements. The high capacity anode chosen for this study is tin. Thin films of tin have been coated onto quartz crystal microbalance sensors and cycled in an electrochemical quartz crystal microbalance (EQCM). The effect of the additive/co-solvent fluoroethylene carbonate (FEC) has been evaluated. Coin cell studies have also been undertaken and confirm that FEC increases couloumbic efficiency, thus decreasing the irreversible capacity loss. The additive amount of 2% FEC is enough to derive the benefits in the cells at a slow cycling rate, while 5% FEC is required for the cells cycled at a higher rate. Using EQCM, the processes of the decomposition of the electrolyte on the electrode surface and Li alloying/dealloying with Sn were characterized quantitatively by surface mass change at the molecular level. EQCM studies demonstrated that the mass accumulated per mole of electrons (mpe) was varied in different electrochemical processes, which reveals that the reduction products of the electrolyte with/without FEC are different. The results of tin studies may have similarities to the effect of FEC on other anode surfaces
机译：虽然在消费电子产品中无处不在，但锂离子电池可以在许多层面上提高。通过这项工作，我们的目标是理解和控制高容量阳极和非水电池电解质之间的固体电解质间（SEI）的形成。添加剂通常用于增强高容量阳极（硅，锡和锂）的循环寿命和库仑效率，几乎没有了解改进的机制。本研究选择的高容量阳极是锡。锡的薄膜已涂覆到石英晶体微稳定传感器上并循环在电化学石英晶体微稳定（EQCM）中。已经评估了添加剂/共溶剂氟乙基碳酸酯（FEC）的作用。还进行了硬币细胞研究并确认FEC增加了Couloumbic效率，从而降低了不可逆的容量损失。添加量为2％FEC足以以缓慢的循环速率从细胞中的益处，而细胞以更高的速率循环的5％FEC。使用EQCM，通过分子水平的表面质量变化，定量地表征电极表面上的电解质和Li合金化/易用的电解质的分解方法。 EQCM研究表明，每摩尔电子（MPE）积聚的质量在不同的电化学过程中变化，这表明电解质的还原产物与/不含FEC是不同的。锡研究的结果可能与FEC对其他阳极表面的影响相似

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