Black phosphorus – carbon (BP – C) composite is a potential high‐energy anode material for lithium‐ion batteries (LIBs); however, the local stress concentration that occurs during lithiation/delithiation cycling leads to poor cycling performance. Herein, an electrochemically inactive TiP nanocrystal is used to reconstruct the BP – C composite via ball milling to form a BP – TiP – C multiphase structure with excellent lithium storage performance. The TiP intermediate optimizes the TiP – BP interface and relieves the local stress of the BP – TiP – C composite, thereby enhancing the electron transfer, structural stability, and utilization of the active material. This BP – TiP – C composite exhibits a high coulombic efficiency of 99.85%, an enhanced cyclic stability of 557.6 mAh g −1 after 1000 cycles with a 72.5% capacity retention at 2.0 A g −1 , and an excellent rate performance of 548.2 mAh g −1 at 10.0 A g −1 . Thus, this study not only provides a high‐energy BP – TiP – C material, but also offers new ideas for material synthesis to advance the research on BP‐based LIBs.
Anisotropy is a significant and prevalent characteristic of materials, conferring orientation-dependent properties, meaning that the creation of original symmetry enables key functionality that is not found in nature. Even with the advancements in atomic machining, synthesis of separated symmetry in different directions within a single structure remains an extraordinary challenge. Here, we successfully fabricate NiS ultrafine nanorods with separated symmetry along two directions. The atomic structure of the nanorod exhibits rotational symmetry in the radial direction, while its axial direction is characterized by divergent translational symmetry, surpassing the conventional crystalline structures known to date. It does not fit the traditional description of the space group and the point group in three dimensions, so we define it as a new structure in which translational symmetry and rotational symmetry are separated. Further corroborating the atomic symmetric separation in the electronic structure, we observed the combination of stripe and vortex magnetic domains in a single nanorod with different directions, in accordance with the atomic structure. The manipulation of nanostructure at the atomic level introduces a novel approach to regulate new properties finely, leading to the proposal of new nanotechnology mechanisms.
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