Transition metal selenides are regarded as potential sodium storage materials for their high theoretical capacity and superior electrical conductivity. However, unsatisfied cycle stability and rate capability, which is caused by its intrinsic structural instability and sluggish conversion reaction, greatly hinder the application. Herein, in-situ electrostatic attraction and selenization process are used to construct Ni_0.5Co_0.5Se₂/Ti₃C₂T_x composite, in which the homogeneous Ni_0.5Co_0.5Se₂ nanoparticles are anchored in the Ti₃C₂T_x MXene architecture. Based on the unique confinement effect and strong chemical interface coupling, the volume expansion and aggregation of the Ni_0.5Co_0.5Se₂/Ti₃C₂T_x anode during the cycling process are effectively prevented. Furthermore, the evenly Ni_0.5Co_0.5Se₂ bimetallic selenides nanoparticles endow rapid charge transfer and redox kinetics due to shortened Na⁺ diffusion distance and more accessible active sites. As a result, the as-prepared Ni_0.5Co_0.5Se₂/Ti₃C₂T_x anode exhibits long cycle stability over 1000 cycles at 2.0 A g^-1, pushing forward the construction of advanced conversion-type anode for high-performance sodium-ion batteries.

过渡金属硒化物因其高理论容量和优异的导电性而被认为是潜在的钠存储材料。然而，由于其固有的结构不稳定性和缓慢的转化反应，导致循环稳定性和倍率性能不理想，极大地阻碍了其应用。本文采用原位静电吸引和硒化工艺构建了Ni _0.5 Co _0.5 Se ₂ /Ti ₃ C ₂ T _x复合材料，其中均匀的Ni _0.5 Co _0.5 Se ₂纳米颗粒锚定在Ti ₃ C ₂ T中。_x MXene 架构。基于独特的限制效应和强化学界面耦合，有效防止了Ni _0.5 Co _0.5 Se ₂ /Ti ₃ C ₂ T _x负极在循环过程中的体积膨胀和聚集。此外，均匀的Ni _0.5 Co _0.5 Se ₂双金属硒化物纳米颗粒由于缩短了Na ⁺扩散距离和更易接近的活性位点而赋予了快速的电荷转移和氧化还原动力学。结果，所制备的Ni _0.5 Co _0.5 Se ₂ /Ti ₃ C₂ T _x^{负极在2.0 A g -1}下表现出超过1000次循环的长循环稳定性，推动了高性能钠离子电池先进转换型负极的构建。