首页|In Situ-Constructed LixMoS2 with Highly Exposed Interface Boosting High-Loading and Long-Life Cathode for All-Solid-State Li-S Batteries
In Situ-Constructed LixMoS2 with Highly Exposed Interface Boosting High-Loading and Long-Life Cathode for All-Solid-State Li-S Batteries
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As the persistent concerns regarding sluggish reaction kinetics and insufficient conductivities of sulfur cathodes in all-solid-state Li-S batteries(ASSLSBs),numerous carbon additives and solid-state electrolytes(SSEs)have been incorporated into the cathode to facilitate ion/electron pathways around sulfur.However,this has resulted in a reduced capacity and decomposition of SSEs.Therefore,it is worth exploring neotype sulfur hosts with electronic/ionic conductivity in the cathode.Herein,we present a hybrid cathode composed of few-layered S/MoS2/C nanosheets(＜5 layers)that exhibits high-loading and long-life performance without the need of additional carbon additives in advanced ASSLSBs.The multifunctional MoS2/C host exposes the abundant surface for intimate contacting sites,in situ-formed LixMoS2 during discharging as mixed ion/electron conductive network improves the S/Li2S conversion,and contributes extra capacity for the part of active materials.With a high active material content(S+MoS2/C)of 60 wt％in the S/MoS2/C/Li6PS5CI cathode composite(the carbon content is only～3.97 wt％),the S/MoS2/C electrode delivers excellent electrochemical performance,with a high reversible discharge capacity of 980.3 mAh g-1(588.2 mAh g-1 based on the whole cathode weight)after 100 cycles at 100 mA g-1.The stable cycling performance is observed over 3500 cycles with a Coulombic efficiency of 98.5％at 600 mA g1,while a high areal capacity of 10.4 mAh cm-2 is achieved with active material loading of 12.8 mg cm-2.
all-solid-state lithium-sulfur batteriesconversion/intercalationhigh-loading and long-lifelow carbon contentmixed ionic/electronic conductivities
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