Encapsulating sulfur into mesoporous TiO2 host as a high performance cathode for lithium-sulfur battery

摘要: Abstract The commercialization of lithium–sulfur (Li–S) battery has so far hindered by the low electrochemical utilization and rapid capacity fading sulfur cathode, which is induced electric/ionic conductivity, high dissolution intermediate polysulfides volume expansion sulfur. Herein, we describe an on-site adsorption strategy toward superior stability electrode encapsulating elemental into mesoporous TiO 2 host. Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM) scanning (STEM) measurements obviously indicate that (S) occupy mesopores host, forming a core–shell liked nanostructure. /S composite exhibits cycling Coulombic efficiency during charge/discharge process. Even at current rate 1 C, shows initial specific 650 mAh g −1 retention 89% after 100 cycles. excellent performances are critical related to significant roles host played reaction. Firstly, nano-sized (∼5 nm) traps via chemical bonding interaction prevent their minimize “shuttle effect”. More importantly, in situ formed Li x , acting as mixed conductor, facilitates easier + /e − transport. unique functions plus its easy availability make study conceptually provides new opportunities reach long-term cathode using carbon-free hosts.