کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5127241 | 1489008 | 2017 | 6 صفحه PDF | دانلود رایگان |
- First study of SEI formers effect on Li distribution within the SEI layer.
- Li content was 2.5Â x greater within the SEI resulting from EC versus VC after 600Â h.
- Li loss from the positive electrode was unaffected by electrolyte composition.
Lithium loss resulting from positive electrode deterioration and lithium accumulation within the solid electrolyte interphase (SEI) at the negative electrode leads to charge capacity loss in lithium-ion batteries (LIBs). We present a novel method to quantify origins of capacity loss resulting from positive electrode degradation and lithium immobilization within the SEI by comparative lithium depth profiles using Lithium Nuclear Reaction Analysis (Li-NRA). Li(Ni0.4Mn0.4Co0.2)O2/artificial graphite (NMC442/AG) pouch cells were cycled with electrolytes containing 1Â M LiPF6 in either 1:1 ethylene carbonate (EC)/dimethyl carbonate (DMC) or DMC with 3% vinylene carbonate (VC) SEI former. Lithium accumulated rapidly within the SEI in cells containing EC as compared to cells containing VC. Lithium loss from the positive electrode occurred at a linear rate, after formation, which was independent of electrolyte composition tested. The technique and methods provide quantitative insight into the impact of materials on capacity loss.
Journal: Journal of Energy Storage - Volume 14, Part 1, December 2017, Pages 106-111