Poly(vinylidenefluoride-co-hexafluoropropylene)(PVDF-HFP)based gel polymer electrolytes are widely studied owing to their electrochemical stability and high dielectric constant.However,most gel polymer electrolytes sh...Poly(vinylidenefluoride-co-hexafluoropropylene)(PVDF-HFP)based gel polymer electrolytes are widely studied owing to their electrochemical stability and high dielectric constant.However,most gel polymer electrolytes show unsatisfied safety and interface compatibility due to excessive absorption of volatile and flammable liquid solvents.Herein,by using a safe solvent(N-methyl-2-pyrrolidone)with higher boiling(203℃)and flash points(95℃),we initiatively fabricate a flexible PVDF-HFP based gel polymer electrolyte.The obtained gel polymer electrolyte demonstrates a high ionic conductivity of 7.24×10^−4 S cm−1,an electrochemical window of 5.2 V,and a high lithium transference number of 0.57.As a result,the synthesized polymer electrolyte exhibits a capacity retention of 70%after 500 cycles at 0.5 C,and a discharge capacity of 86 mAh g−1 even at a high current rate of 10 C for LiFePO4 based Li metal batteries.Moreover,a stable Li plating/stripping for more than 500 h is achieved under 0.1 mAh at both room temperature and 70℃.Our results indicate that the PVDF-HFP polymer electrolyte is promising for manufacturing safe and high-performance Li metal polymer batteries.展开更多
Blindness and vision impairment are the most devastating global health problems resulting in a substantial economic and social burden.Delivery of drug to particular parts of the anterior or posterior segment has been ...Blindness and vision impairment are the most devastating global health problems resulting in a substantial economic and social burden.Delivery of drug to particular parts of the anterior or posterior segment has been a major challenge due to various protective barriers and elimination mechanisms associated with the unique anatomical and physiological nature of the ocular system.Drug administration to the eye by conventional delivery systems results in poor ocular bioavailability(<5%).The designing of a novel approach for a safe,simple,and effective ocular drug delivery is a major concern and requires innovative strategies to combat the problem.Over the past decades,several novel approaches involving different strategies have been developed to improve the ocular delivery system.Among these,the ophthalmic in-situ gel has attained a great attention over the past few years.This review discussed and summarized the recent and the promising research progress of in-situ gelling in ocular drug delivery system.展开更多
基金supported by Special fund of key technology research and development projects(20180201097GX,20180201099GX,20180201096GX)Jilin province science and technology department.The R&D Program of power batteries with low temperature and high energy,Science and Technology Bureau of Changchun(19SS013)+4 种基金National Key R&D Program of China(2016YFB0100500)the National Natural Science Foundation of China(21905041)the Fundamental Research Funds for the Central Universities,Project funded by China Postdoctoral Science Foundation,and Natural Science Foundation of the Jilin Province Education department(JJKH20190265KJ)The Fundamental Research Funds for the Central Universities(2412019FZ015)Key Subject Construction of Physical Chemistry of Northeast Normal University.
文摘Poly(vinylidenefluoride-co-hexafluoropropylene)(PVDF-HFP)based gel polymer electrolytes are widely studied owing to their electrochemical stability and high dielectric constant.However,most gel polymer electrolytes show unsatisfied safety and interface compatibility due to excessive absorption of volatile and flammable liquid solvents.Herein,by using a safe solvent(N-methyl-2-pyrrolidone)with higher boiling(203℃)and flash points(95℃),we initiatively fabricate a flexible PVDF-HFP based gel polymer electrolyte.The obtained gel polymer electrolyte demonstrates a high ionic conductivity of 7.24×10^−4 S cm−1,an electrochemical window of 5.2 V,and a high lithium transference number of 0.57.As a result,the synthesized polymer electrolyte exhibits a capacity retention of 70%after 500 cycles at 0.5 C,and a discharge capacity of 86 mAh g−1 even at a high current rate of 10 C for LiFePO4 based Li metal batteries.Moreover,a stable Li plating/stripping for more than 500 h is achieved under 0.1 mAh at both room temperature and 70℃.Our results indicate that the PVDF-HFP polymer electrolyte is promising for manufacturing safe and high-performance Li metal polymer batteries.
文摘Blindness and vision impairment are the most devastating global health problems resulting in a substantial economic and social burden.Delivery of drug to particular parts of the anterior or posterior segment has been a major challenge due to various protective barriers and elimination mechanisms associated with the unique anatomical and physiological nature of the ocular system.Drug administration to the eye by conventional delivery systems results in poor ocular bioavailability(<5%).The designing of a novel approach for a safe,simple,and effective ocular drug delivery is a major concern and requires innovative strategies to combat the problem.Over the past decades,several novel approaches involving different strategies have been developed to improve the ocular delivery system.Among these,the ophthalmic in-situ gel has attained a great attention over the past few years.This review discussed and summarized the recent and the promising research progress of in-situ gelling in ocular drug delivery system.
