Journal
CHEMPHYSCHEM
Volume 18, Issue 23, Pages 3402-3406Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201700921
Keywords
cathode; electrochemistry; HF scavenger; Lithium ion battery; silyl functional group
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1A6A1A06015181]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2016R1C1B1009452, 2017M1A2A2044506]
- Materials and Components Technology Development Program of MOTIE/KEIT [10076731]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10076731] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017M1A2A2044504] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Dimethoxydimethylsilane (DODSi) is used as an interface stabilizing additive through a selective HF scavenging reaction for layered Ni-rich oxide cathodes. Exsitu NMR analyses demonstrated that DODSi effectively removes HF from the electrolyte based on the matched chemical reactivity of Si with F- and O with H+. The cells employing DODSi exhibit higher specific capacity with retention than those cycled with a DODSi-free electrolyte even under insitu HF generating conditions. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-mass spectroscopy (ICP-MS) analyses indicate that DODSi effectively protects the Ni-rich oxide cathodes against HF corrosion, resulting in improved surface stability of Ni-rich cathodes.
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