Enhanced electrochemical performance of ion-beam-treated 3D graphene aerogels for lithium ion batteries |
| |
| Affiliation: | 1. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China;2. Do-Fluoride Chemicals Co., Ltd, Jiaozuo 454000, China;3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;4. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;1. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China;2. Do-Fluoride Chemicals Co., Ltd, Jiaozuo 454000, China;3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;4. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China;2. Department of Chemical Engineering and Technology, Shanghai University, Shanghai 200444, PR China;3. School of Chemical and Material Engineering, Chizhou University, Chizhou, PR China |
| |
| Abstract: | High energy light-ion (3.8 MeV He) bombardment is used to introduce lattice defects in a 3-dimensional (3D) interconnected network of graphene aerogels (GAs). When these materials are used as anodes for lithium ion batteries, we observe improved percentage reversible capacity and cycle stability compared to those without ion-beam treatment. Furthermore, all ion-beam treated 3D graphene samples exhibit substantially higher Coulombic efficiencies, suggesting at beneficial role of vacancy-type defects in stabilizing solid-electrolyte interphases. Although 3D graphene exhibits initial reversible capacities that are 2–3 times higher than that of graphite (∼372 mAh/g), fast capacity fading is observed but becomes more stable after ion-beam treatment. Our experimental results demonstrate that ion-beam treatment is an effective route to tune and produce good-performance graphene electrodes, and that vacancy-type defects help to promote reversible lithium storage capacity in graphene. We further observe that 3D GAs irradiated to the highest dose studied (1016 cm−2) fail rapidly upon electrochemical cycling, likely caused by the excessive ion-beam damage and graphene restacking. Raman I(D)/I(D′) signature is considered linked to defect type in graphene and thus is proposed, for the first time, as an indicator of the reversible capacity for GAs. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
