Affiliation:
1. State Key Lab of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE) School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China
2. Shaanxi Fengxi Zhiyuan New Material Technology Co., Ltd Xi'an 710049 P. R. China
3. School of Chemistry & Instrumental Analysis Center Xi'an Jiaotong University Xi'an 710049 P. R. China
Abstract
AbstractTitanium disulfide (TiS2) is a promising anode material for sodium‐ion batteries due to its high theoretical capacity, but it suffers from severe volume variation and shuttle effect of the intermediate polysulfides. To overcome the drawbacks, herein the successful fabrication of TiS2@N,S‐codoped C (denoted as TiS2@NSC) through a chemical vapor reaction between Ti‐based metal–organic framework (NH2‐MIL‐125) and carbon disulfide (CS2) is demonstrated. The C─N bonds enhance the electronic/ionic conductivity of the TiS2@NSC electrode, while the C─S bonds provide extra sodium storage capacity, and both polar bonds synergistically suppress the shuttle effect of polysulfides. Consequently, the TiS2@NSC electrode demonstrates outstanding cycling stability and rate performance, delivering reversible capacities of 418/392 mAh g−1 after 1000 cycles at 2/5 A g−1. Ex situ X‐ray photoelectron spectroscopy and transmission electron microscope analyses reveal that TiS2 undergoes an intercalation‐conversion ion storage mechanism with the generation of metallic Ti in a deeper sodiation state, and the pristine hexagonal TiS2 is electrochemically transformed into cubic rock‐salt TiS2 as a reversible phase with enhanced reaction kinetics upon sodiation/desodiation cycling. The strategy to encapsulate TiS2 in N,S‐codoped porous carbon matrices efficiently realizes superior conductivity and physical/chemical confinement of the soluble polysulfides, which can be generally applied for the rational design of advanced electrodes.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for Central Universities of the Central South University
State Key Laboratory of Electrical Insulation and Power Equipment
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
1 articles.
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