Kondo Yasuyuki, Abe Takeshi, Yamada Yuki
SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka, Ibaraki 567-0047, Osaka, Japan.
Graduate School of Engineering, Kyoto University, Nishikyo-ku 615-8510, Kyoto, Japan.
ACS Appl Mater Interfaces. 2022 May 25;14(20):22706-22718. doi: 10.1021/acsami.1c21683. Epub 2022 Feb 15.
The development of high-rate lithium-ion batteries is required for automobile applications. To this end, internal resistances must be reduced, among which Li transfer resistance at electrode/electrolyte interfaces is known to be the largest. Hence, it is of urgent significance to understand the mechanism and kinetics of the interfacial Li transfer. This Spotlight on Applications presents recent progress in the analysis and mechanical understanding of interfacial Li transfer. First, we review the reported activation energies () at various solid/liquid interfaces. On this basis, the mechanism and rate-determining step of the interfacial Li transfer are discussed from the viewpoints of the desolvation of Li, the nature of the solid electrolyte interphase (SEI), and the surface structural features of electrodes. After that, we introduce promising strategies to reduce the , highlighting some specific cases that give remarkably low . We also note the variations in frequency factors or pre-exponential factors () of the interfacial Li transfer, which are primarily dominated by the number of Li intercalation sites on electrode surfaces. The current understanding and improvement strategies of interfacial Li transfer kinetics presented herein will be a foundation for designing high-rate lithium-ion batteries.
汽车应用需要开发高功率锂离子电池。为此，必须降低内阻，其中电极/电解质界面处的锂转移电阻已知是最大的。因此，了解界面锂转移的机制和动力学具有迫切的意义。本应用聚焦介绍了界面锂转移分析和力学理解方面的最新进展。首先，我们回顾了在各种固/液界面报道的活化能（）。在此基础上，从锂的去溶剂化、固体电解质界面（SEI）的性质以及电极的表面结构特征等角度讨论了界面锂转移的机制和速率决定步骤。之后，我们介绍了降低的有前景的策略，突出了一些给出极低的具体案例。我们还注意到界面锂转移的频率因子或指前因子（）的变化，其主要由电极表面锂嵌入位点的数量决定。本文介绍的界面锂转移动力学的当前理解和改进策略将为设计高功率锂离子电池奠定基础。
