Englishen françaisfr Deutschde русскийru españoles portuguêspt 한국의ko Türkçetr Polskipl ไทยth

Give us a call

+8617720812054
other
User Feedback
Home /

User Feedback

Electrode preparation and cell test

May 12 , 2021

Super P conductive carbon , polyvinylidene fluoride , and Clevios_ P solution (CP,from H. C. Starck, Inc.) were used as received. Sodium (Na) salt of carboxymethyl cellulose (NaCMC, with a typical molecular weight of 250 000 and degree of substitution of 0.90) was purchased from Sigma-Aldrich. The Li salt of CMC (LiCMC)was obtained by passing the NaCMC solution through a column of strongly acidic gel-type resin (Amberlite_ IR-120H ionexchange resin from Sigma-Aldrich) by neutralization with an aqueous solution of LiOH.Because one of the main purposes of this work is to investigate the effects of binders and electrolytes on the performance of the organic cathode materials, 40% SP was added to the electrode to minimize the effect of poor conductivity of organic cathode materials during this investigation. The synthesized PAQS powder and SP were mixed at 1 : 1 weight ratio and milled for 30 minutes on a Spex SamplePrep_ 8000M planetary ball mill. A binder solution (PVDF in NMP, or CP and LiCMC in water) was added to make the composition of PAQS/SP/binder to 4 : 4 : 2 by weight. The slurry was cast on an aluminium foil After the solvent was evaporated inside a fume hood, the electrode sheet was pressed at 1000 psi for one minute and die-cut into disks with a diameter of 1.43 cm and an area of 1.61 cm2, Using electrode disc punching machine. Then the electrode disks were dried at ca. 120 _C under vacuum overnight and stored in an vacuum glove box  filled with purified argon. Ethylene carbonate (EC), dimethyl carbonate (DMC), 1,2- dimethoxy ethane (DME), lithium hexafluorophosphate (LiPF6) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) were purchased from Novolyte Technologies (Independence, OH); all were of battery grade. Anhydrous 1,3-dioxolane (DOL) was purchased from Sigma-Aldrich. Li foil with a thickness of 0.75 mm was obtained from Alfa Aesar. All solvents and Li salts were used as received. All solvent mixtures and electrolyte solutions were prepared in the glove box(Xiamen Tmaxcn Inc.) filled with purified argon of moisture and oxygen content less than 1 ppm. Coin-cell kits of 2325 type were purchased from the Canada National Research Council (CNRC). Li|PAQS half cells were assembled inside the glove box by stacking the following components in a stainless-steel (SS) coin-cell pan: a PAQS electrode disk, two pieces of Celgard_ 3501 polypropylene film (diameter 1.90 cm, from CNRC), 80 mL electrolyte, a Li foil disk (diameter 1.59 cm), a SS spacer, a SS spring, and a SS cover with a polypropylene (PP) gasket. The entire battery assembly was crimped on a pneumatic coin cell crimper at a gas pressure of 200 psi. The assembled coin cells were tested in an Arbin BT-2000 Battery Tester The cells were cycled between 1.5 and 3.5 V vs. Li/Li+ at different discharge rates. Cyclic voltammetry was measured on a CHI660C electrochemical station (CH Instruments, Austin, TX) at a scan rate of 0.1 mV s_1, with the PAQS electrode as working electrode and Li as both reference and counter electrodes. All the electrochemical tests were performed at room temperature.


Home

Products

about

contact