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The influence of surface morphology of aluminum foil in lithium battery on battery performance

by:dcfpower     2021-02-25
Abstract: 10-20μm thick aluminum foil is often used in the cathode of lithium batteries. The chemically corroded aluminum foil with a rough surface was compared with a smooth and flat aluminum foil to investigate the influence of the surface morphology of the aluminum foil on the lithium battery pack. For LiCoO2 lithium battery pack materials with high conductivity and larger particles, there is no significant difference in the lithium battery pack performance of the two aluminum foils. However, for LiFePO4 materials with low conductivity and small particles, there is a big difference in high-rate discharge performance. By optimizing the surface morphology of the aluminum foil and the particle size of the battery material, the performance of the battery can be improved. Keywords: lithium battery; battery performance; surface treatment; conductivity; smooth aluminum foil; rough aluminum foil lithium-ion secondary battery is now considered to be the most promising power energy product in the future, hybrid vehicles and electric vehicles will use lithium-ion storage Electric devices can store more energy, and wind energy and solar energy will be the main focus of household electricity research. u003cpu003eu003c/pu003e Figure 1 shows a battery cell including two electrodes: one electrode is laminated to an aluminum foil current collector by a coated cathode active material (such as lithium cobalt oxide, lithium manganate, and lithium iron phosphate) The other is composed of a coated anode active material (such as natural graphite) laminated to a copper foil current collector, and the sandwich layer between the two electrodes is a separator (such as polyethylene or polypropylene), therefore, The electrode acts as an organic electrolyte due to the movement of electrons and lithium ions (such as ethylene carbonate (EC) and diethyl carbonate (DEC) in secondary batteries). On the other hand, for batteries, lithium iron phosphate active materials and rough aluminum foils, significant differences in morphology have been confirmed to affect high-rate cycling characteristics. The improved performance of the cathode electrode sheet with rough aluminum foil exhibits because of the increased contact with the active and conductive materials on the surface. If it is possible to create an active and conductive material with an optimal pit size, the rough aluminum foil is believed to have a positive impact on battery performance. Report in English: u003cpu003eDownload information [File size: 2.27 MB Downloads: Times] Click to download the file: The influence of the surface morphology of aluminum foil in lithium batteries on battery performance.pdfu003c/pu003eu003cpu003eu003c/pu003eu003c /pu003e
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