Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 161, Issue 10, Pages A1634-A1641Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0541410jes
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Funding
- 3M Canada
- NSERC under the Industrial Research Chairs program
- National Basic Research Program of China (973)
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The effectiveness of Prop-1-ene-1,3-sultone (PBS) and Vinylene carbonate (VC) as electrolyte additives in Li(Ni1/3Mn1/3Co1/3)O-2 (NMC)/graphite pouch cells was studied using in situ measurements of gas evolution, ultra high precision coulometry (UHPC), automated storage experiments and electrochemical impedance spectroscopy (EIS). Gas measurements show that cells containing PBS produce less gas than cells containing 2% VC during formation and much less gas during elevated temperature storage (60 degrees C) at 4.2 V. UHPC cycling and storage results show that cells containing 2% PBS have higher coulombic efficiency, lower charge end point capacity slippage and smaller voltage drop during storage than cells containing 2% VC. The combination of VC and PES shows even better cycling performance than the single additives, however, at the expense of much higher impedance. EIS studies of positive and negative electrode symmetric cells show that the introduction of PBS or VC to control electrolyte affects the individual electrode impedances in a similar way: both increase the negative electrode impedance and decrease the positive electrode impedance. Based on these experiments we suggest that PES is a very useful additive for NMC/graphite Li-ion pouch cells that may encounter high temperatures during storage and cycling. (C) 2014 The Electrochemical Society. All rights reserved.
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