利用 SECM 和 SICM 研究锂离子电池电极中的质量传输

Anjana Raj Raju, Andrew Danis, Steen B. Schougaard
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引用次数: 0

摘要

在全球能源生产向可持续生产转型的过程中,锂离子电池(LIB)是不可或缺的。然而,由于锂离子电池的功率密度有限,在可再生能源存储应用中使用锂离子电池具有挑战性。要理解这一限制的根源,研究电极结构对其孔隙(溶液相)内 Li+ 离子传输的影响至关重要。在这项工作中,使用扫描离子传导显微镜(SICM)和扫描电化学显微镜(SECM)研究了各种多孔 Li4Ti5O12(LTO)薄膜中的溶液相传输。当 LTO 薄膜的孔隙率增加时,SECM 和 SICM 方法曲线显示电流增加。这归因于离子通过薄膜孔隙的传输。使用这两种技术绘制的二维地形图显示了它们检测 LTO 薄膜异质性的能力。最重要的是,这项工作让人们深入了解了这两种扫描探针技术的互补性,可比较的 MacMullin 数证明了这一点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigating mass transport in Li-ion battery electrodes using SECM and SICM

Investigating mass transport in Li-ion battery electrodes using SECM and SICM

Lithium-ion batteries (LIBs) are indispensable as global energy production transitions to sustainable production. Nevertheless, the use of LIBs in renewable energy storage applications is challenging due to their limited power densities. To comprehend the origin of this limitation, it is crucial to investigate the effect of electrode architecture on the Li+ ion transport within their pores (solution-phase). In this work, the solution phase transport in various porous Li4Ti5O12 (LTO) films was investigated using scanning ion conductance microscopy (SICM) and scanning electrochemical microscopy (SECM). When the porosity of LTO film increases, SECM and SICM approach curves show an increase in current. This is attributed to the ion transport through the film pores. The 2D topographical mapping using both techniques shows their ability to detect the LTO film's heterogeneity. Most importantly, this work gives insight into the complementary nature of the two scanning probe techniques as demonstrated by the comparable MacMullin numbers.

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