Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 33, Pages 37047-37053Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c07250
Keywords
scanning electrochemical microscopy; solid electrolyte interface; graphite anode; lithium-ion batteries; in situ
Funding
- National Nature Science Foundation of China [51872157]
- Dongguan Core Technology Key Funding Project [2019622119003]
- Shenzhen Key Laboratory on Power Battery Safety Research [ZDSYS201707271615073]
- Shenzhen Technical Plan Project [KQJSCX20160226191136, JCYJ20170412170911187, JCYJ20170817161753629]
- Special Fund Project for Strategic Emerging Industry Development of Shenzhen [20170428145209110]
- Guangdong Technical Plan Project [2015TX01N011, 2017B090907005]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
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A well-formed solid electrolyte interface (SEI) is critical for achieving long-term cycling stability in lithium-ion batteries (LIBs). However, the SEI remains the poorly understood component in LIBs especially under dynamic conditions. Here, scanning electrochemical microscopy (SECM) was applied to study the spontaneous reaction on a graphite electrode, SEI formation in the first cycle, SEI evolution during 10 cycles, and the stability of the as-formed SEI in the electrolyte. The conversion, dissolution, stabilization, and growth behaviors of the SEI were determined. Moreover, the SECM results were analyzed in combination with ex situ material characterization to understand the SEI on the graphite electrode comprehensively.
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