Strategy toward positive electrode design for high-loading lithium-sulfur battery
High-sulfur-loading is an important condition for the cathode of high energy density lithium-sulfur battery.However,with the increase of areal sulfur loading,the performance of Li-S battery presents a significant decay accompanied by poor electron conduction,slow transformation kinetics of polysulfide and the aggravation of the"shuttle effect".Herein,we discussed the corresponding strategies to solve these problems with the focus on the mass transfer and reaction engineering to promote the development of high energy density batteries.Specifically,strategies are compared from four perspectives of enhancing electron conduction,improving lithium ion mass transfer,optimizing reaction kinetics and inhibiting polysulfide transfer.The analysis shows that the design of 3D highly conductive electrode with adsorption-catalysis dual functions is the most promising strategy.From the perspective of application,this paper also focuses on the safety problem which is often ignored in the design of high-loading cathode.We investigate the feasibility of weakening the positive electrode induction and reducing the risk of thermal failure at source,aiming to provide practical guidance for researchers to optimize the design scheme of high-loading sulfur cathode(≥4mg/cm2).
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维普
