Effect of electrode structure on performance of Si anode in Li-ion batteries: Si particle size and conductive additive |
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| Affiliation: | 1. Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, ROC;2. Materials Research Laboratories, ITRI, Chutung, Hsin-Chu, Taiwan 310, ROC;1. School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People''s Republic of China;2. BUCT-CWRU International Joint Laboratory, College of Energy, Beijing University of Chemical Technology, Beijing 100029, People''s Republic of China;1. Polymers and Composites Division, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Zhenhai District, Ningbo 315201, Zhejiang Province, PR China;2. Physik-Department, Lehrstuhl für Funtionelle Materielien, Technische Universität MÜnchen, James-Franck-Strasse 1, 85748 Garching, Germany;3. Department of Materials, University of Oxford, Parks Rd, OX1 3PH Oxford, United Kingdom;1. Foundation for Research and Technology-Hellas, Institute of Chemical Engineering Sciences, 26504, Patras, Greece;2. Department of Environmental Engineering, Democritus University of Thrace, Greece;3. Department of Electrical and Computer Engineering, Democritus University of Thrace, Greece;1. Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea;2. Korea Institute of Industrial Technology, 6 Cheomdan-gwagiro 208, Buk-gu, Gwangju 61012, Republic of Korea;1. Centre for Nanoscale Science and Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Materials Science and Engineering, Nankai University, Tianjin 300071, China;2. Key Laboratory of Functional Polymer Materials and the Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China |
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| Abstract: | The effects of Si particle size and the amount of carbon-based conductive additive (CA) on the performance of a Si anode in a Li-ion battery are investigated by adopting combinations of two different Si particle sizes (20 and 3 μm on average) and CA contents (15 and 30 wt.%), respectively. The CA contains graphitic flakes and nano-sized carbon black. Cyclic voltammetry, charge–discharge tests, scanning electron microscopy and X-ray diffraction establish that the CA content has a profound effect on the cycle-life and irreversible capacity of the Si anode. The former increases, while the latter decreases significantly with increasing CA content. Reducing the particle size of Si, on the other hand, facilitates the alloying/de-alloying kinetics. For instance a cycle-life of over 50 cycles with >96% capacity retention at a charge capacity of 600 mAh per g-Si has been demonstrated by adopting of 30 wt.% CA and 3 μm Si particles. |
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