三维多孔碳负载氧化锡并协同氟化锂制备高性能锂离子阳极

新型多孔碳纳米片/碳纳米管(PC/CNT)材料表现出丰富的分级孔隙结构,具有较高的氧化锡(SnO₂)负载量。通过PC和CNT交联形成的三维结构能够有效地提高锂离子传输速率和电子的传导。此外,在电极中掺杂的氟化锂(LiF)不仅能够降低SnO₂-PC/CNT-LiF电极的电荷转移电阻,而且还能补充SEI膜形成时消耗的Li+,降低不可逆容量,增强SEI膜的稳定性。研究表明,SnO₂-PC/CNT-LiF电极在电流密度为100 mA·g^-1时,首次可逆比容量达到1642.98 mAh·g^-1,活性物质的利用率高达90.12%,循环100次后,放电比容量仍然达到745.11 mAh·g^-1,且库仑效率仍然保持在95.1%以上,显示出优异的倍率和循环性能。

Three-Dimensional Porous Carbon Loading Tin Oxide and Cooperating with Lithium Fluoride to Prepare High Performance Lithium Ion Anode

New porous carbon nanosheets/carbon nanotubes (PC/CNT) materials showed a rich hierarchical pore structure with high tin oxide (SnO₂) loading. The three-dimensional structure formed by the cross-linking of PC and CNT can improve Li⁺ transmission rate and electron conduction. In addition, lithium fluoride (LiF) doped in the electrode can not only reduce the charge transfer resistance of the SnO₂-PC/CNT-LiF electrode, but also supplement the Li+ consumed during the formation of the SEI film, reduce the irreversible capacity and enhance the stability of the SEI film. The first reversible specific capacity of SnO₂-PC/CNT-LiF electrode reached 1 642.98 mAh·g^-1 at current density of 100 mA·g^-1, and the utilization rate of active material was as high as 90.12%. After 100 cycles, the specific discharge capacity still reached above 745.11 mAh·g^-1, and the coulombic efficiency remained above 95.1%, showing excellent rate and cycle performance.