期刊
CHEMICAL SCIENCE
卷 10, 期 46, 页码 10749-10754出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc03569a
关键词
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资金
- National Science Foundation [NSF CHE 1709391]
- ACS Division of Analytical Chemistry Summer Fellowship
- Hinoree T. and Mrs Kimiyo Enta Fellowship
- China Scholarship Council [CSC201706130031]
Ions at battery interfaces participate in both the solid-electrolyte interphase (SEI) formation and the subsequent energy storage mechanism. However, few in situ methods can directly track interfacial Li+ dynamics. Herein, we report on scanning electrochemical microscopy with Li+ sensitive probes for its in situ, localized tracking during SEI formation and intercalation. We followed the potential-dependent reactivity of edge plane graphite influenced by the interfacial consumption of Li+ by competing processes. Cycling in the SEI formation region revealed reversible ionic processes ascribed to surface redox, as well as irreversible SEI formation. Cycling at more negative potentials activated reversible (de)intercalation. Modeling the ion-sensitive probe response yielded Li+ intercalation rate constants between 10(-4) to 10(-5) cm s(-1). Our studies allow decoupling of charge-transfer steps at complex battery interfaces and create opportunities for interrogating reactivity at individual sites.
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