화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.84, 72-81, April, 2020
DOI10.1016/j.jiec.2019.12.022  Export Citation
Water-processable, sprayable LiFePO4/graphene hybrid cathodes for high-power lithium ion batteries
Ju-Won Jeon1, 2, †, Manik C. Biswas3, Corey L. Patton3, and Evan K. Wujcik3, 4
  • 1Department of Chemistry, Kookmin University, Seoul, Republic of Korea
  • 2Department of Chemical & Biological Engineering, The University of Alabama, Tuscaloosa, AL 35487, United States, Korea
  • 3Department of Chemical & Biological Engineering, The University of Alabama, Tuscaloosa, AL 35487, United States, USA
  • 4Materials Engineering and Nanosensor [MEAN] Laboratory, Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, AL 35487, United States, USA
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Here, we demonstrate facile water-processable and sprayable electrode fabrication methods for LiFePO4/graphene hybrid cathodes in LIBs, without using an organic solvent. The multi-functionality of graphene oxide (GO), as a dispersant, binder, and precursor for the conductive graphene, was exploited in this fabrication process. Additional polymeric binders or conductive carbons were unnecessary. At high current rates, this water-processed LiFePO4/reduced graphene oxide (LFP/rGO) can store a larger amount of charges than conventional LFP cathodes produced by the previously formulated organic slurry-based blade coating method. The LFP/rGO electrode consisting of 80 wt.% LFP and 20 wt.% rGO showed capacity of 37 mA h g-1 at a very high current rate (2040 mA g-1). In contrast, the conventional LFP-based electrodes fabricated with poly(vinylidene fluoride), and carbon black in an organic solvent, exhibited negligible capacity (<1 mA h g-1) at such a high current rate. The cycling stability of the sprayed LFP/rGO electrode was also significantly higher than that of the conventional LFP-based electrodes under harsh electrochemical conditions. After 1000 cycles at 3400 mA g-1 from 1.5 to 4.5 V (vs. Li/Li+), the sprayed LFP/rGO and conventional LFP/PVdF/carbon electrode exhibited capacity retention levels of 88% and 38%, respectively.
Keywords:Water-processable;Lithium iron phosphate;Graphene;Lithium ion battery;Cathode;Energy storage
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