Hasil Pencarian  ::  Simpan CSV :: Kembali

"ABSTRAKSintesis LiFe1-0.5Mn0.5PO4/V/C sebagai katode baterai ion litium telah berhasil dilaksanakan. Material LiFe1-0.5Mn0.5PO4/V/C disintesis dengan prekursor intermediat garam besi yang terdiri dari FeSO4.7H2O, dan NH4H2PO4, prekursor LiOH, prekursor MnSO4.H2O, prekursor NH4VO3, serta prekursor C6H8O7. Prekursor intermediat garam besi disintesis dengan variasi kondisi pH meliputi suasana asam (pH 2), netral (pH 7), dan basa (pH 10), metode pemanasan yang digunakan, serta penambahan perlakuan ultrasonik. Hasil penelitian menunjukkan bahwa kondisi pH sintesis akan mempengaruhi morfologi serta struktur kristal senyawa intermediat yang dihasilkan. Morfologi partikel dari seri asam cenderung berbentuk bulat ataupun oktahedral, seri netral cenderung berbentuk persegi panjang, sementara dari seri basa cenderung berbentuk lembaran. Struktur kristal seri asam menyerupai mineral lipscombite, sedangkan struktur kristal seri netral dan basa memiliki struktur garam besi fosfat. Perlakuan ultrasonik juga memberikan pengaruh terhadap morfologi serta struktur kristal senyawa intermediat yang dihasilkan. Morfologi dari sampel yang dikenai perlakuan ultrasonik cenderung berbentuk oktahedral, sementara durasi perlakuan ultrasonik mempengaruhi ukuran kristalit material. Proses pemanasan mempengaruhi morfologi serta struktur kristal senyawa intermediat yang dihasilkan. Proses pemanasan tanpa metode hidrotermal menghasilkan partikel yang cenderung beragregat. Hasil pengujian memperlihatkan sampel katode yang memiliki konduktivitas optimum didapatkan dari sampel LiFe1-0.5Mn0.5PO4/V/C yang disinter dengan tube furnace sebesar 5.6870 x10-5 S.cm-1, dengan tegangan kerja serta kapasitas pengisian optimum dalam sistem baterai R2032 dengan susunan [Li|1 M LiPF6/EC-DMC| LiFe1-0.5Mn0.5PO4/V/C] masing-masingnya 4.7 V dan 5.6 mAh.g-1.

---

ABSTRACTSynthesis and characterization of LiFe1-0.5Mn0.5PO4/V/C used as lithium ion battery cathode has been successfully conducted. The LiFe1-0.5Mn0.5PO4/V/C composite was synthesized using iron salt intermediate precursors, which consist of FeSO4.7H2O, and NH4H2PO4, LiOH precursor, MnSO4.H2O precursor, NH4VO3 precursor and C6H8O7 precursor. Iron salt intermediate precursors were synthesized at various variable including variations in pH conditions acidic atmosphere (pH 2), neutral (pH 7), and alkaline (pH 10), heat treatments, and the use ultrasonic treatment. The results show that the pH synthesis conditions affect the morphology and crystal structure of the intermediate compounds produced. The morphology of iron salt intermediates in acidic condition was round and octahedral, in neutral condition is rectangular, and in alkaline condition is in sheet form. The crystal in acidic condition favored lipscombite structures, while the neutral and alkaline conditions favored phosphate iron salt structure. The ultrasonic treatment affected morphology and crystal structure of the intermediate compounds produced. The samples subjected to ultrasonic treatment formed an octahedral structure. Heat treatment also affected the morphology and crystal structural of the intermediate compounds produced. Heat treatment without hydrothermal treatment produced aggregated particles. In this work, the best conductivity of the cathode was obtained from LiFe1-0.5Mn0.5PO4/V/C sintered with tube furnace at 5.6870 x10-5 S.cm-1 and a working voltage and charge discharge in R2032 coin cell battery [Li|1 M LiPF6/EC-DMC| LiFe1-0.5Mn0.5PO4/V/C] of 4.7 V and 5.6 mAh.g-1, respectively."

"Sebuah bangunan merepresentasikan dirinya melalui tampilan visual. Secara visual tampilan bangunan tak hanya dilihat dari bentuk saja, namun juga melalui permukaan bangunan terkait. Permukaan dipandang sebagai bagian yang memberikan ekspresi dalam memperlihatkan karakter dan identitas suatu bangunan, sehingga persepsi visual manusia terhadap bangunan akan terbentuk melalui permukaan. Kualitas permukaan suatu bangunan ditentukan oleh kualitas dari material pembangun, sehingga dapat dikatakan bahwa permukaan merupakan representasi dari material. Skripsi ini ditulis bertujuan untuk mengkaji bagaimana permukaan dapat menciptakan kualitas arsitektur, dan bagaimana material dapat menciptakan kualitas permukaan. Dari kajian teori serta studi preseden yang saya lakukan terlihat bahwa permukaan sangat berkaitan dengan sensori manusia, sensory design, dan material. Permukaan akan menstimulasi sensori manusia dalam mempersepsikan arsitektur melalui unsur-unsur sensory design. Persepsi yang diciptakan oleh permukaan, akan sangat dipengaruhi oleh material dari permukaan itu sendiri. Karena suatu material tertentu akan menciptakan kualitas permukaan yang spesifik, dan akan mempengaruhi manusia dalam mempersepsikan suatu bangunan.......A building represents itself through its visual appearance. However, appearance of a building not only represents its form, but also the surface. Surface is seen as a part which provides an expression in showing the character and identity of a building, so that the visual perception of the building will be formed through the surface. The surface quality of a building is determined by the quality of the building material, so it can be said that the surface is a representation of the material. This thesis is written to examine how surfaces can create architectural quality, and how materials can create surface quality. From the theoretical studies and the precedent studies, the surface is closely related to human sensory, sensory design, and materials. The surface will stimulate the human sensory in perceiving the architecture through the elements of sensory design. The perception created by the surface, will be greatly influenced by the material from the surface itself. Because a certain material will create a specific surface quality, and will affect humans in perceiving a building."

"This book provides researchers and graduate students with an overview of the latest developments in and applications of adsorption processes for water treatment and purification. In particular, it covers current topics in connection with the modeling and design of adsorption processes, and the synthesis and application of cost-effective adsorbents for the removal of relevant aquatic pollutants. The book describes recent advances and alternatives to improve the performance and efficacy of this water purification technique. In addition, selected chapters are devoted to discussing the reliable modeling and analysis of adsorption data, which are relevant for real-life applications to industrial effluents and groundwater. Overall, the book equips readers with a general perspective of the potential that adsorption processes hold for the removal of emerging water pollutants. It can readily be adopted as part of special courses on environmental engineering, adsorption and water treatment for upper undergraduate and graduate students. Furthermore, the book offers a valuable resource for researchers in water production control, as well as for practitioners interested in applying adsorption processes to real-world problems in water treatment and related areas."

"This book covers novel research results for process and techniques of materials characterization for a wide range of materials. The authors provide a comprehensive overview of the aspects of structural and chemical characterization of these materials. Includes a compilation of the best research works presented in Symposium 5B "Structural and Chemical Characterization of Metals, Alloys and Compounds," by XXIII International Materials Research Congress (IMRC-2014)."