A γ-Boehmite Nanowhiskers - Polyethylene Glycol 10000/Polyethylene Separator for Lithium-Ion Batteries

Graphical Polyethylene glycol 10000 (PEG-10000) was selected as a dispersant for γ-AlOOH nanowhiskers in the PE coating slurry. The AlOOH-PEG/PE separator maintains its structural integrity even after a 0.5 hour test at 200 degrees Celsius, and lithium-ion battery half-cells assembled with it exhibited a capacity of 73.9 % at a 5 C rate. In this study, a γ-boehmite (γ-AlOOH) – PEG/polyethylene (PE) lithium-ion battery separator was fabricated using a dip-coating method, with γ-AlOOH nanowhiskers being synthesized directly through a hydrothermal process,and polyethylene glycol 10000 (PEG-10000) was chosen for the first time as a dispersant for the γ-AlOOH nanowhiskers in the PE coating slurry{Lee, 2014 #7}. Simultaneously, the membrane's performance was characterized, confirming the significant dispersion effect of PEG-10000, resulting in a porosity as high as 64 % in the AlOOH-PEG/PE, a substantial increase compared to the PE separator (40 %). The AlOOH-PEG/PE separator maintains its structural integrity even after a 0.5 h test at 200 °C, showcasing outstanding stability and significantly improved safety. Besides, the LIB half cells assembled with the PE/AlOOH-PEG separator exhibited remarkable performance, with a capacity of 73.9 % in power capability (at 5 C rate) and a 97.1 % discharge capacity retention rates in cycle performance (after 400 cycles, at 2 C rate). Furthermore, lithium iron phosphate (LiFePO 4 ) batteries utilizing the AlOOH-PEG/PE separator demonstrated significantly enhanced cycling stability and rate capacity.