PEG-VN改性PP隔膜用于高稳定性高效率锂硫电池

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Abstract： Lithium-sulfur （Li-S） batteries are regarded as one of the most promisingcandidates fornext generationenergystoragesystems dueto their high theoretical energy density.However，the practical applicationof Li-S batteries is limited by the low lithium ion （Li+） transport efficiencyandtherapid capacitydecaycausedby theshuttleeffect. Herein，we report a composite comprising Polyethylene glycol （PEG） andvanadium nitride（VN）nanosheets coated onto a commercial polypropylene （PP）separator， called PEG-VN@PP separator.The supercatalyticeffect and adsorption propertiesexhibitedbytheVN nanosheetssignificantly enhance the conversion of polysulfides， thereby improvingboththecapacityandstabilityofLi-Sbatteries.Due tothecoatingofPEG，litumionsareatractedtothepolarfunctional groups，enablingselectivetransport，whichimproves the transport efficiency of Li+ and the rate capability of Li-S batteries. The Li-S battery assembled with PEG-VN@PP exhibits a high specific capacity of 782.0mAh⋅g-1 and an average capacity decay of 0.048% per cycle at 1C（1675mA⋅g-1） for 700 cycles， using the carbon nanotubes/sulfur cathode with a sulfur mass loading of 1.2mg⋅cm-2

KeyWords：Vanadium nitride；Polyethylene glycol;Separatormodification;Shutle efect;Lithium-sulfurbatteries

摘要：锂硫（Li-S）电池因其高理论能量密度被视为下一代能源存储系统中最有前景的候选者之一。（剩余24034字）