<p class="AbstractText">Telah berhasil dibuat membrane separator yang berpotensi diaplikasikan untuk baterai lihitum-ion, membrane separator digunakan untuk proses transfer ion dan mencegah terjadinya arus pendek. Dalam penelitian ini membrane separator PVA/SiO<sub>2</sub> disintesis memggunakan metode <em>electrospinning</em> dengan variasi berat SiO<sub>2</sub> (0, 0.6, 1.2, 2) wt%. SiO<sub>2</sub> yang digunakan adalah hasil ekstraksi silika sekam padi. Pengaruh penambahan SiO<sub>2</sub> pada PVA untuk meningkatkan karakteristik membrane diantaranya porositas, dan stabilitas pada suhu tinggi. Hasil membrane yang berhasil dibuat PVA, dan PVA/SiO<sub>2</sub> membentuk serat nano dengan ukuran diameter serat semakin kecil ketika ditambahkan SiO<sub>2</sub> yaitu ~ 220 nm, ukuran diameter semakin kecil meningkatkan porositas membrane dan meningkatkan kinerja membrane dengan stabilitas suhu 165 <sup>o</sup>C</p>
A large amount of sludge is produced by the geothermal brine at the Dieng Geothermal power plant, exceeding 165 tons per month. This sludge is generally not utilized, except for use in landfills. The precipitate (sludge) is primarily composed of silica. The aim of this research is to synthesis mesoporous silica (SiO2) xerogel from geothermal sludge (GS) and to investigate the effects of pH as an effort to elevate the economic value of sludge through alkaline extraction followed by acidification. SiO2 xerogel was prepared by extracting the GS to become sodium silicate (Na2SiO3) assisted by a base NaOH and precipitated using H2SO4 as a gelation agent. The FTIR analysis of the SiO2 xerogel showed a group of silanol (Si-OH) and siloxane (Si-O-Si). The XRD analysis indicated that SiO2 xerogel was amorphous. Furthermore, it was observed from nitrogen absorption-desorption using BET (Breneur-Emmet-Teller) method test that decreased pH tends to the specific surface area increase, and the pore size becomes decrease. The largest specific surface area observed at SiO2 xerogel prepared at pH of 5.5 reached 400.10 m 2 /g with a pore size of 4.5 nm. The pore sized for all cases was in the range of 4 ~12 nm, indicating that the SiO2 xerogels were mesoporous. Pore size of the as-prepared silica affected the thermal stability property of the sample.
The temperature of the lithium-ion battery while running the electric vehicle becomes a severe safety issue. One way to keep the battery work at high temperatures is by a modified battery separator. The separator was used as a component to secure the battery by preventing short circuit current between the electrodes of opposite polarity. This current research reported the high-temperature shrinkage and excellent mechanical strength membrane separator based on PVDF/SiO2 nanofiber produced by double jet sprayers electrospinning method on rotating cylinder collectors. The independent variable in this research was the variation of a SiO2 polymer at 0 ppm, 500 ppm, 1000 ppm, and 3000 ppm. The results of PVDF/SiO2 nanofiber formed have beaded fiber structure with the average size of fiber’s diameter of ~192 nm. The highest amount of SiO2 addition (SiO2 3000 ppm) on PVDF nanofiber’s membrane causes an increase of porosity up to 69%. The addition of SiO2 also strengthens its mechanical and thermal shrinkage properties to 150°C. In the testing of the charge-discharge battery using separator PVDF/SiO2 nanofiber, the specific capacity value is 181 mAh/g.
A separator is one of the main components of lithium-ion batteries. It separates the cathode and anode while allowing the exchange of ions, and reduces the risk of a short circuit that can cause battery failure. In this study, membranes consisting of electrospun, SiO2-containing, poly(vinylidene fluoride) nanofibers were synthesized for use as separators in lithium-ion batteries. Moreover, this study investigated the effect of the volume of colloidal SiO2 (1, 2, and 3 mL) in the precursor (a PVDF/SiO2 solution containing 10 mL of PVDF solution) on the properties of an associated nanofiber membrane and its performance in a coin cell battery. It was found that the porosity, mechanical strength, and thermal resistance of PVDF/SiO2 nanofiber membranes increase with the increasing volume of colloidal SiO2 in the precursor. The PVDF/SiO2 precursor containing 3 mL SiO2 produces an optimal membrane separator with a porosity of 67%, thermal shrinkage ratio of 1.3%, and elongation at break of 24%. These results show that PVDF/SiO2 separators have higher porosity rates than pp and PE membrane separators. Furthermore, the corresponding coin cell battery achieves the highest charge and discharge capacities, i.e., 2.36 and 1.36 mAh/g, respectively.
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.