High capacity silicon/carbon composite anode materials for lithium ion batteries |
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| Affiliation: | 1. Engineering Laboratory for Next Generation Power and Energy Storage Batteries, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;2. Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;3. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China;3. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China |
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| Abstract: | ![]()
Silicon/carbon composite materials are prepared by pyrolysis of pitch embedded with graphite and silicon powders. As anode for lithium ion batteries, its initial reversible capacity is 800–900 mAh/g at 0.25 mA/cm2 in a voltage range of 0.02/1.5 V vs. Li. The material modification by adding a small amount of CaCO3 into precursor improves the initial reversibility (η1=84%) and suppresses the capacity fade upon cycling. A little higher insertion voltage of the composites than commercial CMS anode material improves the cell safety in the high rate charging process. |
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