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EFEK PENAMBAHAN BAHAN ADITIF MWCNT DAN ACETYLENE BLACK (AB) PADA KOMPOSIT Li4Ti5O12 SEBAGAI BAHAN ANODA UNTUK BATERAI Li-ion Subhan, Achmad; Suwandi, Endang; Ramlan, -; Utama, Tiara Hardayanti
Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

Show Abstract | Download Original | Original Source | Check in Google Scholar

AbstrakBahan material elektroda lithium titanate (Li4Ti5O12) merupakan salahÂ satuÂ alternative elektroda anoda yang dapat menggantikan graphite pada baterai Li-ion. Kelebihan lithium titanate dibandingkan graphite adalah memiliki kestabilan struktur kristal yang hampir tidak mengalami perubahan selama proses insersi dan de-insersi ion Li+. Namun lithium titanate memiliki kelemahan yaitu konduktifitas elektrik dan difusi lithium yang masih rendah. Pada penelitian ini telah dilakukan pembuatan komposit terhadap komersil dengan penambahan material aditifÂ acetylene black(AB) dan karbon dari MWCNT (multiwalled carbon nano tube). Dengan variasi variasi massa aditif MWCNT 2%, 4%, 8%, dan AB 2%. Dari hasil uji XRD pada lembaran elektroda menunjukkan fase lithium titanate pada semua sampel dengan parameter kisi 8.35 Ã. Pada uji morfologi dengan SEM menampakkan adanya aglomerasi MWCNT. Uji sel dilakukan dgn membuat konfigurasi sel baterai Li4Ti5O12 // LiFePO4 dengan elektrolit LiPF6 1M. Hasil menunjukkan penggunaan aditif acetylene black (AB) memiliki perfoma baterai yang lebih baik daripadaÂ aditif MWCNT. Sedangkan untuk hasil pengujian konduktivitas lembaran didapatkanÂ bahwa penambahan massa aditif MWCNT dapat meningkatkan konduktivitas listrik hingga mencapai 1.56 x 10-2S/cm. Namun dengan makin bertambahnya aditif MWCNT didapatkan perfoma sel baterai menurun diakibatkan aglomerasi MWCNTÂ Kata kunci: Li4Ti5O12, acetylene black, MWCNT, lembaran komposit elektroda baterai Li-ion.Â AbstractLithium titanate (Li4Ti5O12) could used as anode electrode in Li-ion, replacement graphite in Li-ion battery application. Crystal structure lithium titanate more stable than graphite, is almost unchanged during insertion and deinsertion process Li+ ions. However lithium titanate has disadvantage, lower in electric conductivity and lithium ion diffusion than graphite. In this research were carried out on a commercial Li4Ti5O12 powder to made composite sheet with additives acetylene black (AB) and carbon of MWCNT (multiwalled carbon nano tube) to increase electric conductivity. Variation of the mass variation MWCNT additives were 2%, 4%, 8%, and for AB 2% in wt. From the test results on the sheet electrode by XRD showed the lithium titanate phase in all samples with lattice parameters 8:35 Ã. Unfortunatelly, from SEM revealed the presence of MWCNT agglomeration. Cell test was done with making configuration Li4Ti5O12 // LiFePO4 battery cell with 1M LiPF6 electrolyte. The results showed additives acetylene black (AB) has a better battery performance than additive MWCNT. As for the sheet conductivity test results showed that the addition of additive mass of MWCNT could increase the electrical conductivity of up to 1.56 x 10-2 S/cm. However, with increasing MWCNT additives obtained performer battery cells decreases due to the agglomeration of MWCNT.Keywords : Li4Ti5O12, acetylene black, MWCNT, composite sheet Li-ion battery electrodes

Characteristics of Vanadium Doped And Bamboo Activated Carbon Coated LiFePO4 And Its Performance For Lithium Ion Battery Cathode Sofyan, Nofrijon; Alfaruq, Subkhan; Zulfia, Anne; Subhan, Achmad
Jurnal Kimia dan Kemasan Vol. 40 No. 1 April 2018
Publisher : Balai Besar Kimia dan Kemasan

Vanadium doped and bamboo activated carbon coated lithium iron phosphate (LiFePO4) used for lithium ion battery cathode has been successfully prepared. Lithium iron phosphate was prepared through a wet chemical method followed by a hydrothermal process from the starting materials of LiOH, NH4H2PO4, and FeSO4.7H2O. The dopant variations of 0 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% of vanadium and a fixed 3 wt.% of bamboo activated carbon were carried out via a solid-state reaction process each by using NH4VO3 as a source of vanadium and carbon pyrolyzed from bamboo tree, respectively. The characterization was carried out using X-ray Diffraction (XRD) for the phase formed and its crystal structure, Scanning Electron Microscope (SEM) for the surface morphology, Electrochemical Impedance Spectroscopy (EIS) for the conductivity, and battery analyzer for the performance of lithium ion battery cathode. The XRD results show that the phase formed has an olivine based structure with an orthorhombic space group. Morphology examination revealed that the particle agglomeration decreased with the increasing level of vanadium concentrations. Conductivity test showed that the impedance of solid electrolyte interface decreased with the increase of vanadium concentration indicated by increasing conductivity of 1.25 x 10-5 S/cm, 2.02 x 10-5 S/cm, 4.37 x 10-5 S/cm, and 5.69 x 10-5 S/cm, each for 0 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% vanadium, respectively. Vanadium doping and bamboo activated carbon coating are promising candidate for improving lithium ion battery cathode as the initial charge and discharge capacity at 0.5C for LiFePO4/C at 7 wt.% vanadium is in the range of 8.0 mAh/g.

INVESTIGATION OF THE PERFORMANCE OF SINGLE AND MULTI-CELL STACKS OF PEMFC -, Indriyati; Irmawati, Yuyun; Subhan, Achmad
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

The performance of single, 3-cell, and 5-cell stacks of PEMFC have been experimentally investigated. Emphasiswas placed on the effect of different operating condition including hydrogen/oxygen flow rate and pressure on thePEMFC performance through analysis of polarization curves. The results showed that flow rate slightly affected theperformance of single-cell PEMFC at higher current densities whereas no significant differences were observed atlower current densities. Similar curve patterns were obtained when testing the single and 3-cell PEMFC stacks withvariation of backpressure. Increasing backpressure gives positive effect on the stack performance due to improvingthe reaction at the electrodes. However, this behavior did not occur on 5-cell PEMFC stack the performance of which decreased as the backpressure increased from 5 to 10 psi due to increasing water production in the cathode. In this study, the highest operational (at voltage of 0.6 V) current density of 85.6 mA/cm2 was obtained from 3-cell stack with flow rate of H2/O2 and backpressure 800/1,000 ml/min and 10 psi, respectively. This good performanceis more evident when the 3-cell stack was evaluated over a quite long operation time. After decreasing gradually at the first 50 min operation, the performance of 3-cell stack of PEMFC remained stable up to 200 min, while it fluctuated in 5-cell stack due to poor water management. This study confirms that the performance of PEMFC stack is highly influenced by the number of cell and operating condition, and the performance of PEMFC stack is not linear as function of number of cell.

Pengaruh Waktu Deposisi dan Temperatur Substrat Terhadap Pembuatan Kaca Konduktif FTO (Fluorine doped Tin Oxide) [The Influence of Deposition Time and Substrate Temperature in Manufacturing Process of FTO (Fluorine doped Tin Oxide) Conductive Glass] Arini, Tri; Lalasari, Latifa Hanum; Yuwono, Akhmad Herman; Firdiyono, F; Andriyah, Lia; Subhan, Achmad
Metalurgi Vol 32, No 1 (2017): Metalurgi Vol. 32 No. 1 April 2017
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Manufacturing FTO (fluorine-doped tin oxide) is expected to replace ITO (indium tin oxide) because the process is simple and relatively low cost. Tin chloride precursor with fluorine doping is prepared via sol-gel method with a coating process with spray pyrolisis technique can be considered as a new breakthrough in DSSC device structures. This experiment uses the raw material tin (II) chloride hydrate (SnCl2.2H2O) as precursors and ammonium fluoride (NH4F) as a doping ratio of 6% wt with variation in temperatures of 250, 300, 350, 400 °C and time resistivities of 5, 20, 30 and 40 minutes. The results showed that the longer deposition time decreasing value of conductive glass resistivity. This condition would reduce the value of transmittance. High transmittance and low resistivity obtained on the variation of deposition time 5 minutes with a substrate temperature of 300 °C with a resistivity value of 3.16 x 10-4 Ω.cm and transmittance value of 86.74%AbstrakPembuatan FTO (flourine-doped tin oxide) ini diharapkan dapat menggantikan fungsi ITO (indium tin oxide) karena proses pembuatan yang sederhana dan biaya yang relatif rendah. Prekursor timah klorida dengan doping flourine yang dipreparasi melalui metode sol-gel dengan proses pelapisan dengan teknik spray pyrolisis dapat dipertimbangkan sebagai suatu terobosan baru di dalam struktur device sel surya tersensitasi zat pewarna. Percobaan ini menggunakan bahan baku timah (II) klorida hidrat (SnCl2.2H2O) sebagai prekursor dan amonium florida (NH4F) sebagai doping dengan rasio 6 %berat dengan variasi temperatur 250, 300, 350, 400 °C dan dengan variasi waktu 5, 20, 30, dan 40 menit. Hasil percobaan menunjukkan bahwa semakin lama waktu deposisi maka akan semakin kecil nilai resistivitas kaca konduktif. Namun semakin lama waktu deposisi akan mengurangi nilai transmitansi. Pada percobaan ini menghasilkan transmitansi tinggi dan resistivitas rendah diperoleh pada variasi waktu deposisi 5 menit dengan temperatur substrat 300 °C dengan nilai resitivitas 3,16 x 10-4 Ω.cm dan nilai transmitansi 86,74%.

Synthesis and Characterization of PVDF-LiBOB Electrolyte Membrane with ZrO2 as Additives Etty Wigayati; Rosyid Ridlo; Achmad Subhan; Ibrahim Purawiardi
The Journal of Pure and Applied Chemistry Research Vol 6, No 3 (2017): Edition of September - December 2017
Publisher : Chemistry Department, The University of Brawijaya

The electrolyte membrane serves as ions medium transport and as a separator between the anode and cathode in lithium ion battery. The polymer used for the electrolyte membrane must have sufficiently high mechanical strength to withstand the pressure between the anode and cathode, a thin size and has a chemical and thermal stability.Polymer electrolyte membrane of Lithium bisoxalate Borate(LiBOB) salt with PVdF as matrix polymer and the additive is ZrO2 has been fabricated. The method used is a doctor blade. The concentration of the additive is varied. The membranes were characterized using FT-IR, XRD, SEM and EIS. XRD analysis showed that the crystallinity index increases with the addition of ZrO2. The presence of functional groups bewteen Lithium salts and polymer interaction shown by FTIR analysis. The morphology of the membrane surface was shown by SEM analysis. SEM image and mapping show the morphology of the membrane have typical porous layer. The electrical conductivity increases with additions of ZrO2.

Contribution Succinonitrile Additive for Performa LiTFSi Solid Polymer Electrolytes for Li-Ion Battery Qolby Sabrina; Titik Lestariningsih; Christin Rina Ratri; Achmad Subhan
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 2, August 2020
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol1.iss2.art2

The purpose of this study is to evaluate the performance of Solid Polymer Electrolyte (SPE) which has the role of replacing liquid electrolyte in the battery system to reduce leakage. Evaluation of electrochemical SPE consisted of mixture lithium salt, solid plasticizer, and polymer precursor with different ratio. Impedance spectroscopy was used to investigate ionic conduction and dielectric response lithium bis(trifluoromethane)sulfony imide (LiTFSI) salt, and additive succinonitrile (SCN) plasticizer. The result showing enhanced high ionic conductivity. In half-cell configurations, wide electrochemical stability window of the SPE has been tested. The great potential of SPE for applications in lithium-ion batteries can be seen from the ability of window stability at room temperature. Additive SCN contributes to forming pores that make it easier for the Li-ion to move from the anode to the cathode and vice versa for better perform SPE. Pore of SPE has been characterization with FE-SEM. Additive 50% w.t SCN shows the best ionic conductivity with 4.2 volt wide stability window and pretty much invisible pores.

Electrochemical Performance of Li4-xTi5CuxO12 for Lithium Ion Capacitor Applications Ahmad Sohib; Achmad Subhan; Wahyu Bambang Widayatno; Slamet Priyono; Chairul Hudaya; Ilma Nuroniah; Sherly Novia Sari; Bambang Prihandoko
Widyariset Vol 6, No 1 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.1.2020.43-50

Lithium titanat (LTO) has attracted considerable attention since it has unique characteristics for energy storage application. Doped LTO is one of approach to improve LTO performance. To date, doped LTO performance in full cell lithium ion capacitor has rarely been discussed. This study is aimed to synthesize Cu-doped LTO via solid state reaction and high energy milling and investigate its electrochemical performance in full cell of lithium ion capacitor. Cu-doped LTO is synthesized via solid state method with high energy milling. Diffraction pattern exhibit that Cu-doped LTO has been successfully synthesized even some impurities such as Baddeleyite, ZrO2, and Li2O appear in each sample. Cyclic voltammogram profile of half-cell based Cu-doped LTO shows that the oxidation and reduction peaks are declined due to its impurities contain. electrical resistance of LTO and Cu-doped LTO becomes smaller as increasing dopant contain while charge transfer resistance is higher. Full cell performance of LIC represent that undoped LTO//Activated carbon shows higher capacitance, namely 430 µFg-1 at specific current of 50 mAg-1than that of 2.5%-Cu-doped LTO//AC holds 15 µFg-1.

Electrochemical Performance of Li4-xTi5CuxO12 for Lithium Ion Capacitor Applications Ahmad Sohib; Achmad Subhan; Wahyu Bambang Widayatno; Slamet Priyono; Chairul Hudaya; Ilma Nuroniah; Sherly Novia Sari; Bambang Prihandoko
Widyariset Vol 6, No 1 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.1.2020.43-50

Lithium titanat (LTO) has attracted considerable attention since it has unique characteristics for energy storage application. Doped LTO is one of approach to improve LTO performance. To date, doped LTO performance in full cell lithium ion capacitor has rarely been discussed. This study is aimed to synthesize Cu-doped LTO via solid state reaction and high energy milling and investigate its electrochemical performance in full cell of lithium ion capacitor. Cu-doped LTO is synthesized via solid state method with high energy milling. Diffraction pattern exhibit that Cu-doped LTO has been successfully synthesized even some impurities such as Baddeleyite, ZrO2, and Li2O appear in each sample. Cyclic voltammogram profile of half-cell based Cu-doped LTO shows that the oxidation and reduction peaks are declined due to its impurities contain. electrical resistance of LTO and Cu-doped LTO becomes smaller as increasing dopant contain while charge transfer resistance is higher. Full cell performance of LIC represent that undoped LTO//Activated carbon shows higher capacitance, namely 430 µFg-1 at specific current of 50 mAg-1than that of 2.5%-Cu-doped LTO//AC holds 15 µFg-1.

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