Amorphous Sn modified nitrogen-doped porous carbon nanosheets with rapid capacitive mechanism for high-capacity and fast-charging lithium-ion batteries
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
Amorphous Sn modified nitrogen-doped porous carbon nanosheets with rapid capacitive mechanism for high-capacity and fast-charging lithium-ion batteries
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.
amorphous Sn / rapid capacitive mechanism / lithium-ion storage / nitrogen-doped carbon / fast charging
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