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In situ fabrication of porous graphene electrodes for high-performance lithiumoxygen batteries
Authors:Xin Ji  Xingbao Zhu  Xiqiang Huang  Yuanguo Wu  Weihua Wan  Tian Yang  Yingzhang Yan  Yu Wang  Zhe Lü
Affiliation:1. Department of Physics, Harbin Institute of Technology, Harbin 150080, China;2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150000, China;3. State Key Laboratory of Advanced Chemical Power Sources, Zunyi 563000, China
Abstract:These years, Li/>O<sub>2</sub> batteries attract wide interest because of its high theoretical energy density. However, the catalytic activity and porous structure of cathode remains a great challenge. In this work, we developed a hierarchical porous graphene foam to serve as a battery cathode, which has much richer active sites for cathodic reaction and channels for Li<sup>+</sup> transfer and O<sub>2</sub> diffusion. The cathode exhibits a superior specific capacity as high as 9559 mAh g<sup>?1</sup> at 57 mA g<sup>?1</sup> and remains a high-rate capability of 3988 mAh g<sup>?1</sup> at an increased current density of 285 mA g<sup>?1</sup>. Benefiting from the well-designed cathode structure, the battery can be stably operated for 150 cycles with a stable voltage profile and voltage efficiency up to 65%. The well-designed graphene has a potential to be a superior free-standing cathode to other carbon-based materials due to its good combination of its hierarchical and porous structure, large surface area, abundant defects and excellent mechanical stability.</td> </tr> <tr> <td align=
Keywords:Lithium-air battery  Porous graphene  In situ synthesis  Chemical vapor deposition  Cathode structure
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