Amorphous Sn modified nitrogen-doped porous carbon nanosheets with rapid capacitive mechanism for high-capacity and fast-charging lithium-ion batteries |
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Authors: | Chong Xu Guang Ma Wang Yang Sai Che Neng Chen Ni Wu Bo Jiang Ye Wang Yankun Sun Sijia Liao Jiahao Yang Xiang Li Guoyong Huang Yongfeng Li |
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Affiliation: | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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Abstract: | Sn-based materials are considered as a kind of potential anode materials for lithium-ion batteries (LIBs) owing to their high theoretical capacity. However, their use is limited by large volume expansion deriving from the lithiation/delithiation process. In this work, amorphous Sn modified nitrogen-doped porous carbon nanosheets (ASn-NPCNs) are obtained. The synergistic effect of amorphous Sn and high edge-nitrogen-doped level porous carbon nanosheets provides ASn-NPCNs with multiple advantages containing abundant defect sites, high specific surface area (214.9 m2·g−1), and rich hierarchical pores, which can promote the lithium-ion storage. Serving as the LIB anode, the as-prepared ASn-NPCNs-750 electrode exhibits an ultrahigh capacity of 1643 mAh·g−1 at 0.1 A·g−1, ultrafast rate performance of 490 mAh·g−1 at 10 A·g−1, and superior long-term cycling performance of 988 mAh·g−1 at 1 A·g−1 after 2000 cycles with a capacity retention of 98.9%. Furthermore, the in-depth electrochemical kinetic test confirms that the ultrahigh-capacity and fast-charging performance of the ASn-NPCNs-750 electrode is ascribed to the rapid capacitive mechanism. These impressive results indicate that ASn-NPCNs-750 can be a potential anode material for high-capacity and fast-charging LIBs. |
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Keywords: | amorphous Sn rapid capacitive mechanism lithium-ion storage nitrogen-doped carbon fast charging |
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