02285nas a2200265   4500008004100000022001400041245008800055210006900143260000800212490000700220520133500227653003301562653001401595653001501609653003101624653003001655100003001685700003401715700002901749700003301778700003201811700002601843700003001869856012001899       2025                        eng d  a2192-650600aMechanochemical large-scale rapid synthesis of ultrapure sodium hexafluorophosphate0 aMechanochemical largescale rapid synthesis of ultrapure sodium h  cJUL0 v903 a<p>
	Among the sodium battery electrolytes, sodium hexafluorophosphate (NaPF6) exhibits superior conductivity, anodic stability, and stable cathode electrolyte interface compared to other electrolytes. Therefore, the synthesis of pure NaPF6 through a simple process is very important. Usually, NaPF6 is synthesized using HF. In our approach, NaPF6 is synthesized by grinding dry ammonium hexafluorophosphate (NH4PF6) and sodium metal. Sodium injects an electron into the ammonium ion, which results in the formation of ammonia and hydrogen. The gram scale synthesis is completed in about 30 min. Purification of the product is not needed. The product purity is confirmed by various spectroscopic and electrochemical techniques. Usually, NaPF6 comprises NaF, HF, and solvents as impurities that affect the performance of SIBs. It has been confirmed that the NaPF6 synthesized by our mechanochemical approach in the absence of solvent is devoid of impurities despite the absence of product purification step. Furthermore, the synthesis of pure NaPF6 (250 g) is demonstrated using a grinder used as household item in cooking Indian pancakes, which costs about 300 USD. The duration of the synthesis of 250 g pure NaPF6 is 1 h. The purity of this sample is comparable to that of NaPF6 (5 g) synthesized using mortar and pestle.</p>
10aammonium hexafluorophosphate10aBatteries10acarbonates10asodium hexafluorophosphate10asodium vanadium phosphate1 aSenthilkumaran, Marimuthu1 aJavaregowda, Bharathkumar, H.1 aRajendran, Prakash, Babu1 aBalasubramanian, Rajalakshmi1 aAjithkumar, Thalasseril, G.1 aRavindranathan, Sapna1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/mechanochemical-large-scale-rapid-synthesis-ultrapure-sodium-hexafluorophosphate02790nas a2200253   4500008004100000022001400041245013300055210006900188260000900257300001600266490000700282520188300289653002202172653002502194653001802219653002402237653002602261653001302287100002402300700002902324700002502353700003002378856012802408       2025                        eng d  a1944-824400aModulation of lithium ion transport and cycling stability using rigid and flexible urethane moieties on the backbone of polymers0 aModulation of lithium ion transport and cycling stability using   cNOV   a63784-637910 v173 a<p>
	Graphite is the anode of choice for lithium-ion batteries. Due to volume change and poor conductivity of inorganic materials, they do not show comparable performance to that of graphite. Conjugated polymers are attractive because of their modularity and ease of synthesis. Herein, we report three polymers based on diketopyrrolopyrrole (DPP) as the anode. In an energy device, stored charges are due to a diffusive and capacitive component. Increasing the capacitive component is a challenge in both organic and inorganic systems. In our polymers, we installed urethane moieties that increase the capacitive component. The excellent Li+ ion transporting urethane moiety is part of the polymer chain. The Li+ ion transport is also impacted by the packing of the polymer chain. Therefore, the DPP units and urethane moieties are connected with either an alkyl chain, phenyl or biphenyl. The polymers with either alkyl or phenyl spacers showed stable cycling stability over 4000 charge-discharge cycles. On the other hand, the specific capacity of the batteries comprising a polymer with biphenyl started decreasing after 500 charge-discharge cycles. This is due to the solubility of the polymer in the battery electrolyte. The polymer with a phenyl spacer showed a higher Li+ ion diffusion coefficient due to the space generated between the polymer chains. The X-ray photoelectron spectroscopy analysis showed that the Li+ ions are bound to carbonyls, indicating the role of urethane in the charge transport. The polymer with an alkyl spacer showed a very high specific capacity of 600 mAh/g (1500th cycle) at a current density of 0.2 A/g, which is much higher than the theoretical capacity of graphite (372 mAh/g). The charge storage in all these polymers is dominated by a capacitive component, with the highest metric of 81% shown by a polymer with an alkyl spacer.</p>
10aCycling stability10adiketopyrrolopyrrole10ahigh capacity10alithium-ion battery10anon-conjugatedpolymer10aurethane1 aKargude, Radhakisan1 aRajendran, Prakash, Babu1 aKika, Sharmin, Percy1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/modulation-lithium-ion-transport-and-cycling-stability-using-rigid-and-flexible-urethane