On the cationic nature of lithium polysulfide in lithium-sulfur batteries
Lithium-sulfur(Li-S)battery,with an ultra-high theoretical en-ergy density of 2600Wh/kg,is inevitably deemed as one of the most promising alternatives for the state-of-the-art lithium-ion(Li-ion)batteries[1].As a typical conversion-type of batteries,Li-S batteries comply multi-electron transfer and multiphase trans-formation between elemental S and lithium sulfide(Li2S)during charging/discharging,accompanied by a series of dissolved LiPSs with a general formula of Li2Sn(n=4,6 or 8)[2].The dissolved Li2Sn are traditionally considered to exhibit high ionization degree to dissociate into polysulfide anions(Sn2-),behaving as a typi-cal weak electrolyte.The Sn2-species can accelerate the inter-facial charge transfer via the equilibrium-driven solubilization of the inert S solids and the redistribution of active S,which enables fast solid-liquid-solid S conversion and electrochemical redox at the cathode/electrolyte interface[3].However,the dissolved Li PS species also simultaneously shuttle between electrodes during the aforementioned processes,i.e.,the so-called"shuttle effect",result-ing in active S loss,continuous anode corrosion,and the resultant fast cell failure[4].Therefore,it remains essential to acquire deeper understandings of the intrinsic properties,behaviors(including dissolution,diffusion,and shuttling),and solvation structures of LiPSs.
nature、batteries、cationic、lithium-sulfur、polysulfide
34
G23;H315;G301
2023-05-09（万方平台首次上网日期，不代表论文的发表时间）
共2页
5-6
