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Tawaddod Alkindi1 Rahmat Susantyoko1 Hamda Al Shibli1 Amarsingh Kanagaraj1 Boo Hyun An1 Saif Al Mheiri1 Daniel Choi1

1, Masdar Institute of Science and Technology part of Khalifa University of Science and Technology, Abu Dhabi, , United Arab Emirates

Although Li-ion batteries are very promising for energy storage applications, their areal capacity is quite low (2.09 mAh cm-2 for conventional LiFePO4 on aluminum foil). The aim of this work is to enhance the areal capacity of LiFePO4 cathode via Surface-Engineered Tape-Casting (SETC) technique. SETC technique enables fabrication of strong stand-alone structured carbon nanotube (CNT) sheet with tunable thickness and composition. The CNTs form electrically conductive networks that also result in enhancing the charge transport of Li-ions. In addition, areal capacity will be increased by using the following approaches: increasing the thickness of CNT-LiFePO4 sheet and changing the CNT/LiFePO4 ratio. We will determine the optimum thickness and composition of the CNT-LiFePO4 sheet. Batteries will be assembled in a glove box and characterized (CV, charge-discharge, EIS) using a potentiostat/galvanostat. Investigation of the multi-layered CNT-LiFePO4 sheets by scanning electron microscopy, Raman scattering spectroscopy and X-ray diffraction is also in progress. Preliminary results show 0.4 mAh cm-2 for 2 layers of CNT-LiFePO4 (CNT:LiFePO4 = 1:1, w/w ratio). Fabrication of the electrodes with more than 10 layers of CNT-LiFePO4 is in progress. Such thick CNT-LiFePO4 electrodes is very good candidate for applications which is very sensitive to weight but not sensitive to size, such as space applications and electrical vehicles.

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