Affiliation:
1. Qinghai Provincial Key Laboratory of New Light Alloys, School of Mechanical Engineering Qinghai University Xining 810016 China
2. Qinghai Beijie new material technology Co., LTD Xining 810016 China
3. Institute of Materials China Academy of Engineering Physics Jiangyou 621908 China
4. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150080 China
Abstract
AbstractIn 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 (LiFePO4) batteries utilizing the AlOOH‐PEG/PE separator demonstrated significantly enhanced cycling stability and rate capacity.
Funder
Natural Science Foundation of Sichuan Province