Synthesis and electrochemical performance of reduced graphene oxide/maghemite composite anode for lithium ion batteries |
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| Affiliation: | 1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;2. Department of Biomedical Engineering, The School of Medicine and the UAB Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA;1. College of Communications and Electronics Engineering, Qiqihar University, Heilongjiang 161006, China;2. College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, China;1. Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Viet Nam;2. Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang City 550000, Viet Nam;3. Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea;4. Department of Mechanical Engineering, University of Nevada, Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV 89154, United States;5. Advanced Analysis Center, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea;6. Center for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh City 700000, Viet Nam;1. College of Engineering Technology, Can Tho University, Campus II, 3/2 Street, Ninh Kieu District, Can Tho City, Viet Nam;2. Department of Chemical and Biological Engineering, Gachon University, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea;3. Department of Chemical Engineering, Ethiopian Institute of Technology-Mekelle (EIT-M), Mekelle University, Mekelle, Tigray, 231, Ethiopia;4. Duong Bach Mai High School, Ba Ria-Vung Tau Province, Viet Nam;5. Faculty of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, 700000, Viet Nam;6. Department of Physical Chemistry, Faculty of Chemistry, VNUHCM-University of Science, Viet Nam;7. Applied Physical Chemistry Laboratory (APCLAB), VNUHCM-University of Science, Viet Nam;8. Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam;9. Laboratory of Biofuel and Biomass Research, Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam;10. Ho Chi Minh City University of Technology and Education, 01 Vo Van Ngan Street, Linh Chieu Ward, Thu Duc District, Ho Chi Minh City, 720100, Viet Nam;11. Department of Renewable Energy, Faculty of Vehicle and Energy Engineering, Ho Chi Minh City University of Technology and Education, Viet Nam;12. Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, 700000, Viet Nam;13. Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Viet Nam;1. Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 13120, Republic of Korea;2. Department of Mechanical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, 156-743, Republic of Korea;3. Department of Applied Chemistry, Dongduk Women’s University, Seoul, Republic of Korea 136-714;4. School of Integrative Engineering, Chung-Ang University, Seoul 156-756, South Korea;5. Department of Mechanical Engineering, Gachon University, Seongnam, Gyeonggi 13120, Republic of Korea |
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| Abstract: | Reduced graphene oxide (rGO) tethered with maghemite (γ-Fe2O3) was synthesized using a novel modified sol–gel process, where sodium dodecylbenzenesulfonate was introduced into the suspension to prevent the undesirable formation of an iron oxide 3D network. Thus, nearly monodispersed and homogeneously distributed γ-Fe2O3 magnetic nanoparticles could be obtained on surface of graphene sheets. The utilized thermal treatment process did not require a reducing agent for reduction of graphene oxide. The morphology and structure of the composites were investigated using various characterization techniques. As-prepared rGO/Fe2O3 composites were utilized as anodes for half lithium ion cells. The 40 wt.%-rGO/Fe2O3 composite exhibited high reversible capacity of 690 mA h g?1 at current density of 500 mA g?1 and good stability for over 100 cycles, in contrast with that of the pure-Fe2O3 nanoparticles which demonstrated rapid degradation to 224 mA h g?1 after 50 cycles. Furthermore, the composite showed good rate capability of 280 mA h g?1 at 10C (～10,000 mA g?1). These characteristics could be mainly attributed to both the use of an effective binder, poly(acrylic acid) (PAA), and the specific hybrid structures that prevent agglomeration of nanoparticles and provide buffering spaces needed for volume changes of nanoparticles during insertion/extraction of Li ions. |
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