Recent years have witnessed rapid advances in the toxicologic assessment of biotechproducts.Safety assessment of a biotech product is a complex and multiple process.This includes a knowledge of its pharmaco-biological...Recent years have witnessed rapid advances in the toxicologic assessment of biotechproducts.Safety assessment of a biotech product is a complex and multiple process.This includes a knowledge of its pharmaco-biological characteristics,and identifyingthe target patient population and the proposed clinical application. To make a decision on the safe human application(the products are administering tohumans for therapeutic purposes),besides the identity and purity of the final product,展开更多
Rechargeable lithium-oxygen batteries(Li-O_(2))are one of the most promising candidates for energy storage and electric vehicles due to their high energy density.Nevertheless,their realistic applications are frequentl...Rechargeable lithium-oxygen batteries(Li-O_(2))are one of the most promising candidates for energy storage and electric vehicles due to their high energy density.Nevertheless,their realistic applications are frequently restricted by the safety problems and serious side reactions caused by the use of nonaqueous liquid electrolytes,which makes the service life and safety of these batteries unable to meet the requirements.Here,a durable composite electrolyte membrane was prepared by rationally utilizing oxygen vacancies in flower-like CeO_(2) microspheres to promote the decomposition of lithium salts and scavenge excess oxygen radicals.The prepared composite electrolyte consists of polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP),LiTFSI salt,Li_(7)La_(3)Zr_(2)O_(12),and flower-like CeO_(2) microspheres.The composite electrolyte exhibits a wide electrochemical window(5.1 V vs.Li/Li^(+)),high ionic conductivity(4.86×10^(-4) S cm-1)and ionic transference number(0.65)at room temperature.The assembled solid-state lithium-oxygen battery with this composite electrolyte can be cycled stably for more than 400 times(about 2000 hours).Moreover,solid-state Li|LiFePO4 batteries assembled using this composite electrolyte exhibited good cycling stability and high coulombic efficiency as well.This work designs an extraordinary composite electrolyte with both safety and longevity for lithium-oxygen and lithium-ion rechargeable batteries.展开更多
文摘Recent years have witnessed rapid advances in the toxicologic assessment of biotechproducts.Safety assessment of a biotech product is a complex and multiple process.This includes a knowledge of its pharmaco-biological characteristics,and identifyingthe target patient population and the proposed clinical application. To make a decision on the safe human application(the products are administering tohumans for therapeutic purposes),besides the identity and purity of the final product,
基金the financial support from the Beijing National Laboratory for Condensed Matter Physics,the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(Grant No.2022-K15)the China University of Mining&Technology(Beijing)and the National Natural Science Foundation of China(No.51672029 and 51372271).
文摘Rechargeable lithium-oxygen batteries(Li-O_(2))are one of the most promising candidates for energy storage and electric vehicles due to their high energy density.Nevertheless,their realistic applications are frequently restricted by the safety problems and serious side reactions caused by the use of nonaqueous liquid electrolytes,which makes the service life and safety of these batteries unable to meet the requirements.Here,a durable composite electrolyte membrane was prepared by rationally utilizing oxygen vacancies in flower-like CeO_(2) microspheres to promote the decomposition of lithium salts and scavenge excess oxygen radicals.The prepared composite electrolyte consists of polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP),LiTFSI salt,Li_(7)La_(3)Zr_(2)O_(12),and flower-like CeO_(2) microspheres.The composite electrolyte exhibits a wide electrochemical window(5.1 V vs.Li/Li^(+)),high ionic conductivity(4.86×10^(-4) S cm-1)and ionic transference number(0.65)at room temperature.The assembled solid-state lithium-oxygen battery with this composite electrolyte can be cycled stably for more than 400 times(about 2000 hours).Moreover,solid-state Li|LiFePO4 batteries assembled using this composite electrolyte exhibited good cycling stability and high coulombic efficiency as well.This work designs an extraordinary composite electrolyte with both safety and longevity for lithium-oxygen and lithium-ion rechargeable batteries.
