%0 Journal Article
%T Influence of lithium hexafluorophosphate/ethylene carbonate/dimethyl carbonate electrolyte soaking on heat seal strength of polyamide 6/aluminum/cast
%A Shiyu Du
%A Yang Fan
%A Zhansheng Guo
%J Journal of Plastic Film & Sheeting
%@ 1530-8014
%D 2018
%R 10.1177/8756087916686141
%X The heat-seal strength of polymer¨Cmetal¨Cpolymer laminates, widely used in the packaging industry and more recently for pouch lithium-ion batteries, is a critical factor for the integrity of flexible package structures during service. The influences of lithium hexafluorophosphate/ethylene carbonate/dimethyl carbonate (LiPF6/EC/DMC) electrolyte soaking time and storage temperature on heat-seal strength were investigated through T-peel testing using a universal testing machine. Sealed multilayer laminates¡¯ heat-seal strength and their failure modes were measured for specimens sealed at various heat-sealing temperatures and dwell times before and after exposure to room temperature and 60¡æ soaking conditions. The soaking condition significantly influences heat-seal strength, especially for the packages heat-sealed at low temperatures and short heat-sealing times. Higher storage temperature during electrolyte-soaking accelerates the heat-seal strength decrease. Failure modes are affected by the soaking conditions and become more complicated than the packages without soaking. The optimized heat-sealing processing window is obtained under a certain soaking condition. The electrolyte hydrogen ion concentration (pH) decreases with longer soaking time and higher storage temperature, indicating that acidification may also contribute to decreased heat-seal strength. The results are important for understanding how stored lithium-ion batteries deteriorate and can help to guide battery design to maximize their shelf life
%K Polymer¨Cmetal¨Cpolymer laminates
%K heat-seal strength
%K electrolyte soaking time and storage temperature
%K failure mode
%K pH value
%U https://journals.sagepub.com/doi/full/10.1177/8756087916686141