Although electrically conductive and hydrophilic MXene sheets are promising for multifunctional fibers and electronic textiles, it is still a challenge to simultaneously enhance both conductivity and mechanical properties of MXene fibers because of the high rigidity of MXene sheets and insufficient inter-sheet interactions. Herein, we demonstrate a core–shell wet-spinning methodology for fabricating highly conductive, super-tough, ultra-strong, and environmentally stable Ti₃C₂T_x MXene-based core–shell fibers with conductive MXene cores and tough aramid nanofiber (ANF) shells. The highly orientated and low-defect structure endows the ANF@MXene core–shell fiber with super-toughness of ~ 48.1 MJ m⁻³, high strength of ~ 502.9 MPa, and high conductivity of ~ 3.0 × 10⁵ S m⁻¹. The super-tough and conductive ANF@MXene fibers can be woven into textiles, exhibiting an excellent electromagnetic interference (EMI) shielding efficiency of 83.4 dB at a small thickness of 213 μm. Importantly, the protection of the ANF shells provides the fibers with satisfactory cyclic stability under dynamic stretching and bending, and excellent resistance to acid, alkali, seawater, cryogenic and high temperatures, and fire. The oxidation resistance of the fibers is demonstrated by their well-maintained EMI shielding performances. The multifunctional core–shell fibers would be highly promising in the fields of EMI shielding textiles, wearable electronics and aerospace.

尽管导电和亲水性 MXene 片材有望用于多功能纤维和电子纺织品，但由于 MXene 片材的高刚性和片间相互作用不足，同时提高 MXene 纤维的导电性和机械性能仍然是一个挑战。在此，我们展示了一种核壳湿法纺丝方法，用于制造具有导电 MXene 核和坚韧芳纶纳米纤维的高导电、超韧、超强和环境稳定的 Ti ₃ C ₂ T _x MXene 核壳纤维（ ANF) 炮弹。高度定向和低缺陷的结构赋予 ANF@MXene 核壳纤维约 48.1 MJ m ^{−3的超韧性}, 高强度~ 502.9 MPa, 高导电率~ 3.0 × 10 ⁵ S m ^-1。超韧且导电的 ANF@MXene 纤维可以编织成纺织品，在 213 μm 的小厚度下表现出 83.4 dB 的出色电磁干扰 (EMI) 屏蔽效率。重要的是，ANF壳的保护为纤维提供了在动态拉伸和弯曲下令人满意的循环稳定性，以及优异的耐酸、碱、海水、低温和高温以及防火性能。纤维的抗氧化性通过其保持良好的 EMI 屏蔽性能得到证明。多功能核壳纤维在 EMI 屏蔽纺织品、可穿戴电子产品和航空航天领域具有广阔的应用前景。