Unique porous yolk-shell structured Co3O4 anode for high performance lithium ion batteries |
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| Affiliation: | 1. Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, PR China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, PR China;1. School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, PR China;2. Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, PR China;1. The Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin 150001, PR China;2. Department of Applied Chemistry Engineering, Jilin Vocational College of Industry and Technology, Jilin, 132013, PR China;3. Institute of Advanced Marine Materials, Harbin Engineering University, Harbin 150001, PR China;1. Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China;2. McNair Technology Company Limited, Dongguan City, Guangdong, 523700, China;1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;2. The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;3. Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, PR China;4. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;5. Chongqing Changan New Energy Vehicles Technology Co., Ltd. Chongqing 401120, China |
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| Abstract: | This paper introduces a unique porous yolk-shell structured Co3O4 microball, which is synthesized by spray pyrolysis from precursor solution with polyvinylpyrrolidone (PVP) additive. PVP acts as an organic template in the pyrolytic reaction facilitating the formation of yolk-shell structure. The electrochemical properties of porous yolk-shell Co3O4 microballs evaluated as anode materials for lithium ion batteries exhibit high initial columbic efficiency of 77.9% and high reversible capacity of 1025 mAh g?1 with capacity retention of 98.8% after 150 cycles at 1 A g?1. In contrast, the hollow microballs obtained without PVP addition show obvious capacity decay from 1033 to 748 mAh g?1 after 150 cycles with the capacity retention of 72.3%. In addition, the microballs with porous yolk-shell structure exhibit better rate performance. The superior electrochemical performance is mainly attributed to the unique porous yolk-shell structure which provides large voids to buffer volume expansion and enlarge the contact area with the electrolyte, shortening the diffusion path of the lithium ions. |
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| Keywords: | Porous yolk-shell structure Anode Electrochemical performance Lithium-ion batteries |
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