Evolution of solid electrolyte interphase and active material in the silicon wafer model system

JOURNAL OF POWER SOURCES

卷:482

Article

Stetson, Caleb^1,2  Yin, Yanli²  Norman, Andrew²  Harvey, Steven P.²  Schnabel, Manuel²  Ban, Chunmei²  Jiang, Chun-Sheng²  DeCaluwe, Steven C.¹  Al-Jassim, Mowafak² 

[1] Colorado Sch Mines, 1500 Illinois St, Golden, CO 80401 USA

[2] Natl Renewable Energy Lab, 15013 Denver W Pkwy, Golden, CO 80401 USA

关键词: Lithium-ion batteries;    Silicon anode;    Solid electrolyte interphase;    Scanning probe microscopy;    Time-of-flight secondary ion mass spectrometry;    Scanning transmission electron microscopy;   

DOI  :  10.1016/j.jpowsour.2020.228946

来源: Elsevier

【 摘 要 】

Alloying anode materials for lithium-ion batteries, such as silicon (Si), are an important focus of materials research due to the demand for increased energy density for electric vehicles and stationary grid storage. However, progress towards next generation anode materials has been hindered by poor capacity retention due to the instability of the Si active material and the solid electrolyte interphase (SEI). In this work, the evolution of the active Si material and the SEI are simultaneously investigated from the perspective of chemical, structural, morphological, and electronic evolution in the Si wafer model system through its cycling life, using time-of-flight secondary ion mass spectrometry (TOF-SIMS), scanning transmission electron microscopy (STEM), atomic force microscopy (AFM), and scanning spreading resistance microscopy (SSRM). The results illustrate a dynamic evolution of the SEI and active Si material through cycling. Through an improved understanding of evolution of SEI and Si active material within the Si wafer model system, mitigation strategies may be designed to extend the lifetime of Si anodes.

【 授权许可】

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