This work aims to obtain more hydrophilic and thermal stable electrospun fibrous membranes for lithium‐ion battery separators. For this purpose, the polyvinylidene fluoride/polyacrylonitrile (PVDF/PAN) separators are fabricated via electrospinning and modified by an electron beam with different doses. These preparation processes are simple, fast, and environmentally friendly. As the same time, the physical and electrochemical properties of these separators are investigated in detail. The results indicated that all the irradiated PVDF/PAN (the mass ratio of PVDF and PAN is 1:1) separators can maintain a complete structure till 170°C due to their cross‐linking structure. Besides, the 150‐kGy‐irradiated PVDF/PAN separator exhibits high porosity (82%), excellent electrolyte absorption (497%), and high ionic conductivity (3.19 mS cm−1). As a consequence, the cells with 150‐kGy‐irradiated PVDF/PAN separators show better the C‐rate performance and cycling stability than those of the cells with polypropylene separators and nonirradiated PVDF/PAN separators.
In this study, one-year-old seedlings of Paeonia ostii ‘Fengdan’ were used as materials. The method of spraying exogenous salicylic acid (SA), calcium chloride (CaCl2) and abscisic acid (ABA) was used. The effects of different concentrations of SA, CaCl2 and ABA on the heat tolerance of peony seedlings under high temperature stress were studied. The optimum concentration and mechanism of SA-, CaCl2- and ABA-induced heat tolerance of peony seedlings under high temperature stress were discussed. The results showed that 100 μmol/L SA, 40 mmol/L CaCl2 and 40 mg/L ABA had the best induction effect on the heat tolerance of peony. The effects of three exogenous substances on the heat resistance of peony seedlings were ranked as SA > CaCl2 > ABA. The three exogenous substances mainly alleviated high temperature damage by alleviating the degradation of chlorophyll (Chl), relative electrical conductivity (Rec) content, increasing superoxide dismutase (SOD) activity, soluble proteins (SPs), free proline (Pro) and soluble sugars (SSs) content, and reducing SSs content under high temperature stress. The five indices had the most significant effect on the three exogenous substances in improving the heat resistance of peony seedlings. These could be used as an index to identify the heat resistance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.