期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 20, 页码 22706-22718出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c21683
关键词
lithium-ion battery; ion transfer; electrode/electrolyte interface; activation energy; frequency factor
资金
- JST, PRESTO, Japan. [JPMJPR20AF]
This article presents the recent progress in understanding the mechanism and kinetics of interfacial Li+ transfer in high-rate lithium-ion batteries. It reviews the reported activation energies at different interfaces, discusses the mechanism and rate-determining step of the interfacial Li+ transfer, and introduces promising strategies to reduce the activation energy.
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 (E-a) 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 E-a, highlighting some specific cases that give remarkably low E-a. We also note the variations in frequency factors or pre-exponential factors (A) 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.
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