Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 169, Issue 4, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac6831
Keywords
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Funding
- NSERC [HZ2022-KF07]
- Tesla [HZ2022-KF07]
- Opening Fund of State Key Laboratory of Fire Science (SKLFS) [HZ2022-KF07]
- China Scholarship Council
- USTC Center
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Electrolyte additives significantly affect the performance of lithium-ion cells. In comparative studies, lab-made 95% pure PDO outperformed commercial 99.8% pure PDO in certain tests. Among the PDO-containing cells, the blend of 2%PDO+ 1%LFO showed the best performance in NMC811 cells. PDO-based blends are more promising in cells with higher nickel content.
Electrolyte additives, as a small proportion of the electrolyte, greatly affect the performance of lithium-ion cells. This work performs a comparative study to reveal the difference between commercial 99.8% pure 3-phenyl-1,4,2-dioxazol-5-one (PDO) additive and lab-made 95% pure PDO in NMC622/graphite cells. In addition, a set of experiments were conducted to evaluate the performance of 99.8% pure PDO and its binary blends with vinylene carbonate (VC), 1,3,2-dioxathiolane-2,2-dioxide (DTD) or lithium difluorophosphate (LFO) in NMC811/graphite cells. 99.8% Pure PDO and 95% pure PDO show little difference in the NMC622 cells, with the latter presenting relatively better performance in the best-performing blends for long-term cycling and high-temperature storage tests. Considering all the tests including ultra high precision coulometry (UHPC) cycling, long-term cycling, and high-temperature storage, the NMC811 cells with 2%PDO+ 1%LFO outperformed the other PDO-containing cells. The PDO-based blends were confirmed to be more promising in cells with higher nickel content; that is, PDO could be a useful additive in high-nickel content cells.
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