Commercial carbonate electrolytes suffer from ion transport difficulty in bulk electrolytes and interphase at low temperatures,bringing challenges to the application of lithium-ion batteries(LIBs)at low temperatures.H...Commercial carbonate electrolytes suffer from ion transport difficulty in bulk electrolytes and interphase at low temperatures,bringing challenges to the application of lithium-ion batteries(LIBs)at low temperatures.Herein,the ester solvent of methyl propionate(MP)with low melting point and low viscosity was used to tackle ion transport difficulty in electrolytes.Fluorinated ester was further added to accelerate interfacial transport through intermolecular interactions.The influence of fluorinated esters with different fluorination degrees on the solvation structure of electrolytes and the performance of batteries was further studied.As a result,methyl pentafluoropropionate(M5F)with five fluorine atoms was selected for its optimal interactions with both Li+and MP solvent in the primary solvation structure,contributing to desired solvation structure for fast interfacial transport.The LiFePO_(4)(LFP)||graphite cell with LiFSI-MP-M5F electrolyte exhibited a high cyclability of 85.8%after 120 cycles and retained 81.2%of room-temperature capacity when charged and discharged at−30℃.1 Ah LFP||graphite pouch cell with high cathode loading(20 mg/cm^(2))in LiFSI-MP-M5F electrolyte exhibited 0.85 Ah capacity when charged and discharged at−20℃.This work provides a guidance for electrolyte design by synergistic fluorinated and non-fluorinated solvents for LIBs at low-temperature application.展开更多
Membrane distillation(MD)has gained extensive attention for treating highly saline wastewater.However,membrane scaling during the MD process has hindered the rapid development of this technology.Current approaches to ...Membrane distillation(MD)has gained extensive attention for treating highly saline wastewater.However,membrane scaling during the MD process has hindered the rapid development of this technology.Current approaches to mitigate scaling in membrane distillation focus primarily on achieving enhanced hydrophobicity and even superhydrophobicity via utilizing fluorinated fibrous membrane or introducing perfluorosilane modification.Considering the environmental hazards posed by fluorinated compounds,it is highly desirable to develop non-fluorinated membranes with enhanced anti-scaling properties for effective membrane distillation.In this study,we present a non-fluorinated liquid-like MD membrane with exceptional anti-scaling performance.This membrane was facilely fabricated by grafting linear polydimethylsiloxane(LPDMS)onto a hydrophilic polyether sulfone(PES)membrane pre-coated with the intermediate layers of polydopamine and silica(denoted as LPDMS-PES).Remarkably,LPDMS-PES manifested a drastically improved scaling resistance in continuous MD tests than its perfluorinated counterpart,i.e.,1H,1H,2H,2H-perfluorooctyltrichlorosilane-modified PES membrane(PFOS-PES),in both heterogeneous nucleation-dominated and crystal deposition-dominated scaling processes,despite the latter having a smaller surface energy.LPDMS-PES demonstrated a reduction of crystal accumulation of approximately 85%for Na Cl and 73%for Ca SO_(4) in the heterogeneous nucleation-dominated scaling process compared to PFOS-PES.Additionally,in the crystal deposition-dominated scaling process LPDMS-PES exhibited a reduction of about 70%in scale accumulation.These results explicitly evidenced the great potential of the liquid-like membrane to minimize scaling in membrane distillation by inhibiting both scale nucleation and adhesion onto the membrane.We believe the findings of this study have important implications for the design of high-performance MD membranes,particularly in the quest for environmentally sustainable alternatives to perfluorinated materials.展开更多
Proton exchange membranes(PEMs)are widely employed in energy conversion and storage devices including fuel cells(FCs),redox flow batteries(RFBs)and PEM water electrolysis(PEMWE).As one of the main components of these ...Proton exchange membranes(PEMs)are widely employed in energy conversion and storage devices including fuel cells(FCs),redox flow batteries(RFBs)and PEM water electrolysis(PEMWE).As one of the main components of these devices,a high-performance PEM is always desirable considering the cost challenges from both energy utilization efficiency and production cost.From this century,governments of countries worldwide have introduced PFAS(per-and polyfluoroalkyl substances)restriction related policies,which facilitate the extensive research on non-fluorinated PEMs.Besides,non-fluorinated PEMs become hot topics of all kinds of PEMs due to the advantages including excellent conductivity,high mechanical property,reduced swelling,low cost and reduced ion permeation of electrochemically active species.In this review,various types of non-fluorinated PEMs including main-chain-type hydrocarbon membranes,microphase separation membranes and membranes with rigid-twisted structure are comprehensively summarized.The basic properties of different types of non-fluorinated PEMs including water uptake,swelling ratio,oxidative stability,tensile strength and conductivity are compared and the corresponding application performance in FCs,RFBs and PEMWE are discussed.The state-of-the-art of the structural design in both monomers and polymers is reviewed for the construction of fast ion transport channels and high resistance of free radical attacks.Also,future challenges and possibilities for the development of non-fluorinated PEMs are comprehensively forecasted.展开更多
PHOBOTEX~? RSY durable water repellent delivers best-in-class performance to support the industry's shift to non-fluorinated formulations Continuing to lead the textile sector’s transition to more sustainable and...PHOBOTEX~? RSY durable water repellent delivers best-in-class performance to support the industry's shift to non-fluorinated formulations Continuing to lead the textile sector’s transition to more sustainable and eco-friendly business models,Huntsman Textile Effects has introduced the new PHOBOTEX~?RSY non-fluorinated durable water repellent(DWR)that raises the standard for repellency especially on high-performance synthetic textiles.This new product will allow brands and retailers to meet global demand for eco-friendly clothing that require extreme rain-and stain-protection.展开更多
基金supported by the National Key R&D Program of China(No.2022YFB3803400)National Natural Science Foundation of China(Nos.52102054,52020105010,51927803,52188101 and 52072378)+1 种基金Liaoning Province Science and Technology Planning Project(No.2022-BS-007)Fujian Science and Technology Program(No.2023T3025).
文摘Commercial carbonate electrolytes suffer from ion transport difficulty in bulk electrolytes and interphase at low temperatures,bringing challenges to the application of lithium-ion batteries(LIBs)at low temperatures.Herein,the ester solvent of methyl propionate(MP)with low melting point and low viscosity was used to tackle ion transport difficulty in electrolytes.Fluorinated ester was further added to accelerate interfacial transport through intermolecular interactions.The influence of fluorinated esters with different fluorination degrees on the solvation structure of electrolytes and the performance of batteries was further studied.As a result,methyl pentafluoropropionate(M5F)with five fluorine atoms was selected for its optimal interactions with both Li+and MP solvent in the primary solvation structure,contributing to desired solvation structure for fast interfacial transport.The LiFePO_(4)(LFP)||graphite cell with LiFSI-MP-M5F electrolyte exhibited a high cyclability of 85.8%after 120 cycles and retained 81.2%of room-temperature capacity when charged and discharged at−30℃.1 Ah LFP||graphite pouch cell with high cathode loading(20 mg/cm^(2))in LiFSI-MP-M5F electrolyte exhibited 0.85 Ah capacity when charged and discharged at−20℃.This work provides a guidance for electrolyte design by synergistic fluorinated and non-fluorinated solvents for LIBs at low-temperature application.
基金supported by National Natural Science Foundation of China(Nos.22072185,12072381)Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110221)Fundamental Research Funds for the Central Universities,Sun Yatsen University(No.23yxqntd002)。
文摘Membrane distillation(MD)has gained extensive attention for treating highly saline wastewater.However,membrane scaling during the MD process has hindered the rapid development of this technology.Current approaches to mitigate scaling in membrane distillation focus primarily on achieving enhanced hydrophobicity and even superhydrophobicity via utilizing fluorinated fibrous membrane or introducing perfluorosilane modification.Considering the environmental hazards posed by fluorinated compounds,it is highly desirable to develop non-fluorinated membranes with enhanced anti-scaling properties for effective membrane distillation.In this study,we present a non-fluorinated liquid-like MD membrane with exceptional anti-scaling performance.This membrane was facilely fabricated by grafting linear polydimethylsiloxane(LPDMS)onto a hydrophilic polyether sulfone(PES)membrane pre-coated with the intermediate layers of polydopamine and silica(denoted as LPDMS-PES).Remarkably,LPDMS-PES manifested a drastically improved scaling resistance in continuous MD tests than its perfluorinated counterpart,i.e.,1H,1H,2H,2H-perfluorooctyltrichlorosilane-modified PES membrane(PFOS-PES),in both heterogeneous nucleation-dominated and crystal deposition-dominated scaling processes,despite the latter having a smaller surface energy.LPDMS-PES demonstrated a reduction of crystal accumulation of approximately 85%for Na Cl and 73%for Ca SO_(4) in the heterogeneous nucleation-dominated scaling process compared to PFOS-PES.Additionally,in the crystal deposition-dominated scaling process LPDMS-PES exhibited a reduction of about 70%in scale accumulation.These results explicitly evidenced the great potential of the liquid-like membrane to minimize scaling in membrane distillation by inhibiting both scale nucleation and adhesion onto the membrane.We believe the findings of this study have important implications for the design of high-performance MD membranes,particularly in the quest for environmentally sustainable alternatives to perfluorinated materials.
基金funded by the National Key Research and Development Program of China(No.2022YFB3805300)National Natural Science Foundation of China(Grant No.22125801,22005010).
文摘Proton exchange membranes(PEMs)are widely employed in energy conversion and storage devices including fuel cells(FCs),redox flow batteries(RFBs)and PEM water electrolysis(PEMWE).As one of the main components of these devices,a high-performance PEM is always desirable considering the cost challenges from both energy utilization efficiency and production cost.From this century,governments of countries worldwide have introduced PFAS(per-and polyfluoroalkyl substances)restriction related policies,which facilitate the extensive research on non-fluorinated PEMs.Besides,non-fluorinated PEMs become hot topics of all kinds of PEMs due to the advantages including excellent conductivity,high mechanical property,reduced swelling,low cost and reduced ion permeation of electrochemically active species.In this review,various types of non-fluorinated PEMs including main-chain-type hydrocarbon membranes,microphase separation membranes and membranes with rigid-twisted structure are comprehensively summarized.The basic properties of different types of non-fluorinated PEMs including water uptake,swelling ratio,oxidative stability,tensile strength and conductivity are compared and the corresponding application performance in FCs,RFBs and PEMWE are discussed.The state-of-the-art of the structural design in both monomers and polymers is reviewed for the construction of fast ion transport channels and high resistance of free radical attacks.Also,future challenges and possibilities for the development of non-fluorinated PEMs are comprehensively forecasted.
文摘PHOBOTEX~? RSY durable water repellent delivers best-in-class performance to support the industry's shift to non-fluorinated formulations Continuing to lead the textile sector’s transition to more sustainable and eco-friendly business models,Huntsman Textile Effects has introduced the new PHOBOTEX~?RSY non-fluorinated durable water repellent(DWR)that raises the standard for repellency especially on high-performance synthetic textiles.This new product will allow brands and retailers to meet global demand for eco-friendly clothing that require extreme rain-and stain-protection.
