Tham khảo tài liệu 'lithium-ion batteries part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Plasma-Modified Polyethylene Separator Membrane for Lithium-ion Polymer Battery 63 The cathode was prepared by coating the slurry consisting of 96 lithium cobalt oxide LiCoO2 with 2 poly vinylidene fluoride PVDF as a binder and 2 acetylene black as a conducting agent in a N-methyl pyrrolidone NMP solvent onto aluminum foils. The graphite anode was prepared by coating the slurry of 94 graphite with 6 PVDF onto copper foils. The lithium-ion polymer cells were assembled in the form of the aluminum pouch by sandwiching PE or PiAN-PE membrane between LiCoO2 cathode and graphite anode. After assembling the cell polymer precursor solution was injected into the aluminum pouch which then was vacuum-sealed. Polymer precursor in the cell was thermally cured in the heating oven at 75oC for 4 h to form cross-linked gel polymer electrolytes. The prepared cells were cycled once at C rate to improve the wetting of gel polymer electrolytes and to form stable solid electrolyte interphase SEI layers on the electrode surface. XPS spectra were obtained on a VG ESCALAB 220-I system using Mg Ka X-radiation as the excitation source with a pass energy of eV. XPS analysis was performed under high vacuum conditions 10-9 Torr . All binding energies were referenced to the C1s neutral carbon peak at eV. The membrane surfaces were characterized by contact angle measurements. Water contact angle was determined by means of the sessile drop method and the water droplet was limited to about pl to prevent gravitational distortion of its spherical profile. The surface energies of PE and PiAN-PE membranes were calculated by measuring the contact angle of two testing liquids water and diiodomethane on the surface of the membranes at room temperature using a contact anglemeter G-1 model ERMA Inc. . The morphology of PE and PiAN-PE membranes were observed using a JEOL JSM-6340F SEM. The peel strength was measured at room temperature by a T-peel test using an Instron 4465 testing .
