通过静电纺丝技术制备了NCM523纳米纤维纱线电极,创新采用炭黑(0D)、碳纳米管(1D)与还原氧化石墨烯(2D)的二元复配策略,协同碳纤维柔性基底构建多维导电网络。结果表明:电极(NCM523-1/2/3)具有良好纤维取向性与活性物质负载,X射线衍射(XRD)证实纺丝过程未破坏NCM523晶体结构。电化学测试表明,含碳纳米管/石墨烯的NCM523-3电极性能最优,其电荷转移电阻低至87.18Ω,循环容量达145.99mAh/g(100.09%保持率),5C倍率下容量仍为91.9mAh/g,容量保持率(62.4%)与回复率(96.4%)同步提升,这归因于1D/2D导电剂构建的三维网络显著降低离子扩散阻抗(Warburg因子221)。该网络通过电子/离子双通道协同传输及机械互锁效应,有效提升了导电效率并维持了电极结构完整性。可为高稳定性柔性锂电电极设计提供多维导电剂拓扑优化新思路,揭示了维度协同效应对高倍率性能的关键作用。
This study fabricated NCM523 nanofiber yarn electrodes via electrospinning technology.Innovatively employing a binary compounding strategy of carbon black (0D),carbon nanotubes (1D),and reduced graphene oxide (2D) synergized with a carbon fiber flexible substrate to construct a multidimensional conductive network.Characterization revealed that the electrodes (NCM523-1/2/3) exhibited excellent fiber orientation and active material loading.XRD confirmed the preservation of the NCM523 crystal structure during the spinning process.Electrochemical tests demonstrated that the NCM523-3 electrode containing carbon nanotube/graphene delivered optimal performance,with a charge transfer resistance as low as 87.18Ω,a cycling capacity of 145.99mAh/g (with 100.09% retention rate),a retained capacity of 91.9mAh/g at a 5C rate,and synergistic improvement in capacity retention (62.4%) and recovery rate (96.4%).It was attributed to the three-dimensional conductive network formed by 1D/2D conductive agents,which significantly reduced ion diffusion impedance (Warburg factor:221).This network enhanced conductive efficiency and maintained structural integrity through the synergistic transport of electronic/ion dual-channel and mechanical interlocking effects.The study proposed novel topology optimization insights for multidimensional conductive agents in designing high-stable flexible lithium battery electrodes,and revealed the critical role of dimensional synergy in achieving high-rate performance.
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基金资助
“天山英才”科研项目(2023TSYCLJ0008)
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