Embedding Heterostructured α‐MnS/MnO Nanoparticles in S‐Doped Carbonaceous Porous Framework as High‐Performance Anode for Lithium‐Ion Batteries
Yuan Ma, Yanjiao Ma, Thomas Diemant, Kecheng Cao, Ute Kaiser, R. Jürgen Behm, Alberto Varzi, Stefano Passerini
Abstract
Abstract In this work, the synthesis of α‐MnS/MnO/S‐doped C micro‐rod composites via a simple sulfidation process is demonstrated, starting from a Mn‐based metal‐organic framework. The resulting heterostructured α‐MnS/MnO nanoparticles (8±2 nm) are uniformly embedded into the S‐doped carbonaceous porous framework with hierarchical micro‐/meso‐porosity. The combination of structural and compositional characteristics results in the promising electrochemical performance of the as‐obtained composites as anode materials for lithium‐ion batteries, coupled with high reversible capacity (940 mAh g −1 at 0.1 A g −1 ), excellent rate capability as well as long cycling lifespan at high rate of 2.0 A g −1 for 2000 cycles with the eventual capacity of ∼300 mAh g −1 . Importantly, in situ X‐ray diffraction studies clearly reveal mechanistic details of the lithium storage mechanism, involving multistep conversion processes upon initial lithiation.