PEG-VN改性PP隔膜用于高穩(wěn)定性高效率鋰硫電池

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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：鋰硫（Li-S）電池因其高理論能量密度被視為下一代能源存儲(chǔ)系統(tǒng)中最有前景的候選者之一。（剩余24034字）