Synthesis of single lithium-ion conducting polymer electrolyte membrane (SLIC-PEM) composed of polymerized lithium 4-styrenesulfonyl(trifluoromethylsulfonyl)imide (PLiSTFSI), poly-(ethylene glycol) methyl ether methacrylate (PEGM), poly(ethylene glycol) dimethacrylate (PEGDMA), and ethylene carbonate (EC) is reported. SLIC-PEM combines the advantages of single lithium-ion conducting polymer electrolytes, cross-linked flexible polymer electrolytes, and the liquid electrolyte of carbonate. The synthesized SLIC-PEMs have superior thermostability, high ionic conductivity, a wide electrochemical window, and high lithium-ion transference number. The corresponding LiFePO 4 |SLIC-PEM|Li cell delivers high Coulombic efficiency and excellent discharge capacity and cycling performance, demonstrating that SLIC-PEMs will have promising application in nextgeneration safe lithium metal batteries.
Star and linear block copolymers of [poly(4vinylpyridine)-block-polystyrene] n [(P4VP-b-PS) n ] and [polystyrene-block-poly(4-vinylpyridine)] n [(PS-b-P4VP) n ] (n = 1−4) with similar chemical composition but different block sequence were synthesized by RAFT polymerization. Star (P4VP-b-PS) n is composed of a jointed P4VP core and several outer PS arms, and (PS-b-P4VP) n has just the opposite block sequence and different conformation. The effect of block sequence on the block copolymer nanoassemblies is explored. It is discovered that star (P4VP-b-PS) n tends to form complicated nanoassemblies in the block selective solvent for P4VP due to the PS arms bridging, and star (PS-b-P4VP) n acts somewhat like linear amphiphilic block copolymers. Our study demonstrates the crucial role of block sequence in star block copolymer nanoassemblies.
We report high-performance star brush block copolymer electrolytes (SBBCEs) composed of 2-arm star polymer of [poly[poly(ethylene glycol) methyl ether acrylate]b-polystyrene] 2 . The physically crosslinked structure endows SBBCEs with excellent thermal stability and considerable mechanical strength, high ionic conductivity of 2.1 × 10 −4 S cm −1 at 28 °C, wide electrochemical stability window up to 5.6 V, and good interfacial compatibility with lithium anode. A s s e m b l e d L i F e P O 4 | S B B C E | L i a n d N i -r i c h L i -Ni 0.89 Co 0.09 Mg 0.02 O 2 |SBBCE|Li cells deliver superior ambienttemperature cycling performance with high reversible capacities, high Coulombic efficiency, and outstanding cyclic stability at considerable rate of 0.5 C. This proposed idea of employing physically crosslinked structure of brush block copolymer without any chemical crosslinker may broaden a new way to design high-performance polymer electrolytes.
We report a facile, in situ method to prepare interpenetrating networks of single-ion conductive polymer electrolytes (IN-SCPEs) for solid-state lithium metal batteries. IN-SCPEs were synthesized by first mixing lithium 4-styrenesulfonyl(trifluoromethylsulfonyl)imide, poly(ethylene glycol) methyl ether acrylate, poly(ethylene glycol) dimethacrylate, and ethylene carbonate to form cross-linked polymer gel networks and then exposing the composite to ultraviolet (UV) light to initiate radical polymerization. The in situ formed interpenetrating polymer networks ensures high mechanical strength and thermal stability of IN-SCPEs, reduces the activation energy of Li+ conduction, and simultaneously improves the room-temperature ionic conductivity (1.9 × 10–4 S cm–1), Li-ion transfer number (0.90) and electrochemical window (5.3 V). The synthesized IN-SCPEs enable dendrite-free cycling of Li metal anode and stable cycling of LiFePO4|IN-SCPEs|Li cell with low polarization at room temperature.
Platelets express the transmembrane chemokine SR-PSOX/CXCL16, proteolytic cleavage of which generates the sCXCL16 soluble-(s) chemokine. The sCXCL16 engages CXCR6 on platelets to synergistically propagate degranulation, aggregation and thrombotic response. Currently, we have investigated the pro-thrombotic and prognostic association of platelet CXCL16–CXCR6 axis in CAD-(n = 240; CCS n = 62; ACS n = 178) patients. Platelet surface-associated-CXCL16 and CXCR6 surface expression ascertained by flow cytometry correlated significantly with platelet activation markers (CD62P denoting degranulation and PAC-1 binding denoting α2bβ3-integrin activation). Higher platelet CXCL16 surface association (1st quartile vs. 2nd–4th quartiles) corresponded to significantly elevated collagen-induced platelet aggregation assessed by whole blood impedance aggregometry. Platelet-CXCL16 and CXCR6 expression did not alter with dyslipidemia, triglyceride, total cholesterol, or LDL levels, but higher (>median) plasma HDL levels corresponded with decreased platelet-CXCL16 and CXCR6. Although platelet-CXCL16 and CXCR6 expression did not change significantly with or correlate with troponin I levels, they corresponded with higher Creatine Kinase-(CK) activity and progressively deteriorating left ventricular ejection fraction (LVEF) at admission. Elevated-(4th quartile) platelet-CXCL16 (p = 0.023) and CXCR6 (p = 0.030) measured at admission were significantly associated with a worse prognosis. However, after Cox-PH regression analysis, only platelet-CXCL16 was ascertained as an independent predictor for all-cause of mortality. Therefore, the platelet CXCL16–CXCR6 axis may influence thrombotic propensity and prognosis in CAD patients.
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