title: Conductive Polymer-Coated VS4 Submicrospheres As Advanced Electrode Materials in Lithium-Ion Batteries.
abstract: VS4 as an electrode material in lithium-ion batteries holds intriguing features like high content of sulfur and one-dimensional structure, inspiring the exploration in this field. Herein, VS4 submicrospheres have been synthesized via a simple solvothermal reaction. However, they quickly degrade upon cycling as an anode material in lithium-ion batteries. So, three conductive polymers, polythiophene (PEDOT), polypyrrole (PPY), and polyaniline (PANI), are coated on the surface to improve the electron conductivity, suppress the diffusion of polysulfides, and modify the interface between electrode/electrolyte. PANI is the best in the polymers. It improves the Coulombic efficiency to 86% for the first cycle and keeps the specific capacity at 755 mAh g(-1) after 50 cycles, higher than the cases of naked VS4 (100 mAh g(-1)), VS4@PEDOT (318 mAh g(-1)), and VS4@PPY (448 mAh g(-1)). The good performances could be attributed to the improved charge-transfer kinetics and the strong interaction between PANI and VS4 supported by theoretical simulation. The discharge voltage ∼2.0 V makes them promising cathode materials.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education School of Chemistry and Chemical Engineering, Shandong University , Jinan 250100, P.R. China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, P.R. China.
authors.forename: Yanlu
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, P.R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Materials Science and Engineering, Shandong University of Science and Technology , Qingdao 266590, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Tian
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education School of Chemistry and Chemical Engineering, Shandong University , Jinan 250100, P.R. China.
authors.forename: Huayun
authors.initials: H
authors.lastname: Xu
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education School of Chemistry and Chemical Engineering, Shandong University , Jinan 250100, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education School of Chemistry and Chemical Engineering, Shandong University , Jinan 250100, P.R. China.
authors.forename: Weiliu
authors.initials: W
authors.lastname: Fan
keywords: conductive polymer; lithium-ion batteries (LIBs); nanomaterials; solvothermal; sulfides