Lithium Storage Performance Boosted via Delocalizing Charge in Zn Co PS /CoS of 2D/3D Heterostructure.

A promising anode material consisting of bimetallic thiophosphate Zn Co PS and CoS with 2D/3D heterostructure is designed and prepared by an effective chemical transformation. Density functional theory calculations illustrate that the Zn can effectively modulate the electrical ordering of Zn Co PS on the nanoscale: the reduced charge distribution emerging around the Zn ions can enhance the local built-in electric field, which will accelerate the ions migration rate by Coulomb forces and provide tempting opportunities for manipulating Li storage behavior. Moreover, the merits of the large planar size enable Zn Co PS to provide abundant anchoring sites for metallic CoS nanocubes, generating a 2D/3D heterostructure with a strong electric field.

SePnanoparticles confined within porous carbon as a lithium-ion battery anode with superior electrochemical performance.

The exploration of advanced anode materials through rational structure/phase design is the key to developing high-performance rechargeable batteries. Herein, tetraphosphorus tetraselenide (SeP) nanoparticles confined within porous carbon (named SeP@C) are developed for lithium-ion batteries. The designed SeP@C shows a set of structural/compositional advantages as lithium-ion battery anodes including high electrical conductivity, low ion diffusion barrier, and relieved lithiation stress.