Two-dimensional (2D) MXenes become the predominant choice of lithium-ion battery electrode materials owing to large surface-area-to-volume ratio and metallic conductivity, but severe restacking still remains the main obstruct. Herein, a new strategy of avoiding restacking and assuring structural stability is proposed. We demonstrate the fabrication of novel hierarchically porous and robust 2D/2D hybrid architectures consisting of a large thin Ti₃C₂ flake with many standing intersecting TiO₂ nanosheets, followed by generation of well-dispersed Li₃Ti₂(PO₄)₃ nanocrystals. The resulting TiO₂ sheets of 4∼5 nm thick inherit specific layered atomic structures of 2D MXene through in-situ ultrafast reactions in molten-salt, and thus are composed of few layers with ∼0.8 nm layer spacing. The MXene-based composite as an anode delivers high discharge capacity of 204 mAh g^-1 at 50 mA g^-1, rate capability (115 mAh g^-1 at 1000 mA g^-1) and remarkable cycling stability with 193 mAh g^-1 after 500 cycles at 100 mA g^-1. This are attributed to high surface capacitive contributions of the unique 2D/2D robust hybrid architecture that provides enough spaces to accelerate ionic transfer and favorable tolerance to volume variation. This work provides an effective route to rapid generation of MXene-based 2D/2D hierarchical composites for many applications.

二维（2D）MXene由于具有较大的表面积/体积比和金属电导率而成为锂离子电池电极材料的主要选择，但严重的重堆仍是主要障碍。本文提出了一种避免重堆和保证结构稳定性的新策略。我们演示了新型的分层多孔且坚固的2D / 2D混合体系结构的制造，该体系结构由大型Ti ₃ C ₂薄片与许多站立相交的TiO ₂纳米片组成，然后生成了分散良好的Li ₃ Ti ₂（PO ₄）₃纳米晶体。生成的TiO ₂4〜5 nm厚的薄片通过熔融盐中的原位超快反应继承2D MXene的特定层状原子结构，因此由几层组成，层间距约为0.8 nm。所述基于MXene复合物作为阳极的递送204毫安克高放电容量^-1在50mA克^-1，倍率性能（115毫安克^-1以1000mA克^-1）和显着的循环稳定性与193毫安克^-1在100 mA g ^-1下500次循环后。这归因于独特的2D / 2D鲁棒混合架构的高表面电容贡献，该架构提供了足够的空间来加速离子转移和对体积变化的良好容忍度。这项工作为快速生成适用于许多应用的基于MXene的2D / 2D分层复合结构提供了一条有效途径。