Advanced Li-Ion Batteries with High Rate,Stability, and Mass Loading Based on Graphene Ribbon Hybrid Networks |
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Authors: | Dr. Longhai Zhang Prof. Tong Wei Dr. Zimu Jiang Prof. Zhuangjun Fan |
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Affiliation: | 1. College of Science, Harbin Engineering University, Harbin, 150001 China;2. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001 China |
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Abstract: | To optimize the cycle life and rate performance of lithium-ion batteries (LIBs), ultra-fine Fe2O3 nanowires with a diameter of approximately 2 nm uniformly anchored on a cross-linked graphene ribbon network are fabricated. The unique three-dimensional structure can effectively improve the electrical conductivity and facilitate ion diffusion, especially cross-plane diffusion. Moreover, Fe2O3 nanowires on graphene ribbons (Fe2O3/GR) are easily accessible for lithium ions compared with the traditional graphene sheets (Fe2O3/GS). In addition, the well-developed elastic network can not only undergo the drastic volume expansion during repetitive cycling, but also protect the bulk electrode from further pulverization. As a result, the Fe2O3/GR hybrid exhibits high rate and long cycle life Li storage performance (632 mAh g−1 at 5 A g−1, and 471 mAh g−1 capacity maintained even after 3000 cycles). Especially at high mass loading (≈4 mg cm−2), the Fe2O3/GR can still deliver higher reversible capacity (223 mAh g−1 even at 2 A g−1) compared with the Fe2O3/GS (37 mAh g−1) for LIBs. |
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Keywords: | graphene ribbon Li-ion batteries superior cyclability ultra-fine Fe2O3 nanowires |
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