Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 167, Issue 11, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/aba4e7
Keywords
Lithium-ion battery; Mixed salts electrolyte; Li(Ni0; 8Co0; 1Mn0; 1)O2; High temperature
Funding
- National Key Projects for Fundamental Research and Development of China [2017YFB0102000]
- National Natural Science Foundation of China [51922099]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-JSC011]
- Major Program of National Natural Science Foundation of China [21890762]
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The long-term cycle performance of NCM811/Li batteries at high temperature was achieved by mixing LiDFOB and LiPF(6)salts into the ethylene carbonate (EC) and ethyl methyl carbonate (EMC) solution (EC/EMC = 3:7 by volume). The differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) tests indicate 0.8 M LiPF6/0.2 M LiDFOB electrolyte system could improve thermal stability. The NCM811 cell with the mixed lithium salts electrolyte shows superior high temperature cycling performance, as demonstrated by the high capacity retention (89.00%) after 100 cycles at 0.5 C, which is much better than that of the 1.0 M LiPF(6)electrolyte (51.34%). Inductively coupled plasma (ICP), Scanning electron microscopy (SEM) and other spectroscopic analyses reveal that adding LiDFOB salt could suppress Ni/Co/Mn dissolution into the electrolyte, due to the LiDFOB salt can be decomposed to produce a protective CEI layer on NCM811 surface. These results show that mixed lithium salts (LiDFOB and LiPF6) is an efficient solution to enhance the high temperature performance of nickel-rich based lithium-ion batteries.
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