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All Journal Telaah Journal of Technomaterial Physics Makara Journal of Technology Jurnal ELTEK
Bambang Prihandoko, Bambang
LIPI
Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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PENGARUH VARIASI WAKTU PENCAMPURAN TERHADAP PELAT BIPOLAR DENGAN PENAMBAHAN 5% wt MULTIWALLED CARBON NANOTUBES Prihandoko, Bambang; Pirsiani, Rizki; Sadeli, Yunita
Telaah Vol 32, No 2 (2014)
Publisher : Research Center for Physics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/tel.32.2.184

Abstract

Paper ini membahas pembuatan pelat bipolar karbon/karbon komposit dengan filler 80% wt, yang terdiri dari 95% wt grafit dapur busur listrik (electric arc furnace/EAF) dan 5% wt multiwalled carbon nanotubes (MWCNTs). Di samping itu, polimer yang bertindak sebagai matriks berjumlah 20% wt terdiri dari epoksi resin dan hardener dengan perbandingan 1:1. Penelitian pembuatan pelat bipolar ini memvariasikan waktu pencampuran yaitu 30, 60, 90, 120, dan 150 detik. Proses pencampuran menggunakan pengaduk berkecepatan tinggi dengan kecepatan 28000 rpm. Pencetakan menggunakan metode cetak kompresi panas dengan tekanan 55 MPa pada suhu 100 oC selama 4 jam. Hasil penelitian menunjukkan bahwa waktu pencampuran optimum pada 30 detik di mana dihasilkan nilai densitas sebesar 1.61 g/cm3, porositas 0.30%, dan konduktivitas listrik 7.53 S/cm.
Synthesis of LiBOB Fine Powder to Increase Solubility Wigayati, Etty Marti; Lestariningsih, Titik; Ratri, Christin Rina; Purawiardi, Ibrahim; Prihandoko, Bambang
Makara Journal of Technology Vol. 21, No. 1
Publisher : UI Scholars Hub

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Abstract

Lithium bis (oxalate) borate or LiBOB compound has captured interest of researchers, because it is potentially viable to be used as electrolyte salt in lithium-ion battery system. This compound is easy to synthesize and considered to be more environmentally friendly compared to conventional electrolyte salt because LiBOB does not contain halogen element. This research focused on the synthesis of LiBOB fine powder, which main purpose is improving LiBOB salt solubility in liquid electrolyte solution. This will aid the ion transfer between electrodes which in turn will increase the electrolyte performance. Solid state reaction was employed in this experiment. Synthesis of LiBOB compound was performed by reacting oxalic acid dihydrate, lithium hydroxide monohydrate, and boric acid. The resulting powder was then processed into fine powder using ball milling technique with varying milling time (0, 6, 10, and 13) hour. Microstructure of the sample was then analyzed to obtain information regarding phase formation, functional groups, grain surface morphology, surface area, pore volume, solubility, and ionic conductivity. The analysis shown that LiBOB and LiBOB hydrate phase was formed during the reaction, there was no changed in existing phase during milling process, crystallinity index was shifted to lower value but there was no difference in functional groups. Highest value in surface area was found to be 83.11 m2/g, with pore volume of 1.21311e+02 A at 10 hours milling. Smaller powder size resulted in higher solubility, unfortunately the ionic conductivity was found to be decreased.
Synthesis of Cathode Active Material LiMn0.5Fe0.5PO4F/C with Sintering Time Variation Simaremare, Mitra M; Prihandoko, Bambang
Journal of Technomaterial Physics Vol. 4 No. 1 (2022): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v4i1.7758

Abstract

Research has been carried out on the synthesis of LiMn0.5Fe0.5PO4F/C, the cathode active materials with variations in sintering time. The process of producing the LiMn0,5Fe0,5PO4F/C as an active material in lithium battery cathodes has been successfully carried out by the first forming host structure and then infiltrating the lithium Li ions and the flour F ions. In this study, the synthesis was carried out with various sintering time, 6 hours, 8 hours and 10 hours. The raw materials used in this study are manganese dioxide (“MnO2”), iron (III) oxide (“Fe2O3”), lithium fluoride (“LiF”) and phosphoric acid (“H3PO4”) as the solvents. The synthesis was carried out at a calcination temperature of 720°C for 8 hours. The first mashed use a milling process for about 180 minutes, and placed into the oven, then mashed using a mortar. Then the Mn0.5Fe0.5PO4 sample was added with LiF, mixed with the milling process, placed into a drying oven and was varied with the sintering time of 6 hours for the first sample, 8 hours for the second sample and 10 hours for the third sample. As to produce LiMn0.5Fe0.5PO4F material, followed by carbon coating, namely tapioca and sugar (8%:4%). All three samples were calcined at a temperature of 720°C for 4 hours. The results of XRD analysis showed that the three samples did not experience a phase of change, however only shows a few differences in intensity. The results of FESEM analysis show that grain growth occurs vertically and horizontally due to the presence of the Mn and Fe, and with an exact enough amount of tapioca function as a carbon source to coat the active material, it help to creates pores in the powder so that the presence of these pores could provide an intercalation pathway for the lithium ions. At the end the results of the EIS analysis showed that the highest conductivity value of this study was 0.62 x 10-5 S/cm.
Sintesis Dan Karakterisasi Material Katoda LiMn0,7Fe0,3-xNixPO4/C Dengan 0 ≤ X ≤ 0,2 Dalam Aplikasi Baterai Litium-Ion Rudiyansah, Rudiyansah; S, Anne Zulfia; Prihandoko, Bambang
JURNAL ELTEK Vol. 21 No. 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/eltek.v21i2.4393

Abstract

Pati singkong sebagai karbon pelapis bahan aktif LiMnPO4, Fe dan Ni (covalent-doping) ditempuh untuk meningkatkan konduktifitas elektronik-ionik, nilai specific capacity dan working voltage. Proses solid state reaction berupa ball milling (330 rpm, 48 jam) dan sintering (800°C, 2 jam) digunakan dalam pembuatan bahan aktif. Pola difraksi LiMnPO4 terlihat pada uji XRD pada bahan aktif. Bahan aktif terlapisi karbon berukuran 290 nm dan ukuran kristalit 60 nm terbentuk melalui proses Ball Milling. Pengujian SEM memperlihatkan pertumbuhan pelapisan karbon kearah horizontal dan pengujian EDX menunjukkan kadar Mn yang tinggi mengkonfirmasi peran pati singkong sebagai fasilitator pengintian pelapisan karbon. Nilai vibrasi v1 - v4 (1138 dan 1098 cm-1) hasil pengujian FTIR menunjukkan polianion  terbentuk. Pelapisan karbon memberikan nilai konduktifitas elektronik-ionik sebesar 1 x 10-3 S/cm dan 7,2 S/cm, peningkatan nilai konduktifitas elektronik terjadi akibat penambahan Ni. LiMn0,7Fe0,25Ni0,05PO4/C memberikan nilai specific capacity oksidasi 60,92 mAh/gr dan nilai Voks-red sekitar 4,13 Volt dan secara praktikal dapat digunakan sebagai bahan aktif katoda baterai Li-Ion. ABSTRACT Carbon-coating process with starch of cassava in LiMnPO4 active material, co-subtitution by adding Fe and Ni have been used to enhance ionic-electronic conductivity, specific capacity, and working voltage. Pattern diffraction of XRD shown LiMnPO4 structure have been formed via milling process (330 rpm, 48 hours) and sintering process (800°C, 2 hours) as called as solid state reaction. Ball Milling produced active material with the particle size and crystallite size up to 290 nm and 60 nm respectively. Carbon-coating have been grown in horizontal direction in cathode material become an evidence that the starch of cassava have been facilitates nuclea of carbon-coating to grown in cathode material and can be seen by SEM, and also the high content of Mn that have founded by EDX evaluation agreed. Polyanion  have formed and indicated by vibration value of v1 - v4 (1138 and 1098 cm-1) during FTIR evaluation. Electronic conductivity increased up to 1 x 10-3 S/cm by carbon-adding process, and Ni-addition as cation-doping contributed also. LiMn0.7Fe0,25Ni0.05PO4/C of cathode material shown the highest specific capacity oxidation near 60.92 mAh/gr and Voxidation/reduction around 4.13 Volts and practically can be used as Li-Ion battery.  
Co-Authors Christin Rina Ratri, Christin Rina Dedy Setiawan Etty Marti Wigayati Ibrahim Purawiardi, Ibrahim Rizki Pirsiani, Rizki Rudiyansah Rudiyansah S, Anne Zulfia Simaremare, Mitra M SUBHAN, ACHMAD - Titik Lestariningsih, Titik Yunita Sadeli, Yunita