No abstract

ABSTRACT

Abstract. Lithium bis (oxalato) borate or LiBOB is potential candidate to substitute LiPF 6 which has many problems in lithium ion batteries. Many studies have been synthesized of electrolyte salt LiBOB to improve performance as electrolyte lithium ion batteries. In this paper we have studied the synthesis of compounds LiBOB undergoing pre-heat treatment in a vacuum. LiBOB was synthesized by mixing technical grade raw materials H2C2O4.2H2O, LiOH and H3BO3. The mixture H2C2O4.2H2O and LiOH was preheated at 60 °C for 2 h before adding H3BO3 in several time to be mortared in vacuum dryer, the mixture of the three starting materials was preheated in two steps at 70 °C for 6 h and the third step of preheating at a temperature of 100 °C. This powder was then characterized using XRD, FTIR and BET. The characterization results of LiBOB compared to commercial LiBOB powder. The XRD analysis results showed that the sample have formed LiBOB and LiBOB hydrate phase, while FTIR analysis results show the formation of functional groups of LiBOB. In addition, the BET results shows the surface area of synthesized LiBOB is 75.994 m 2 /g, close the surface area of commercial LiBOB, i.e 108.776 m 2 /g.

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 endure 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 namely ZrO 2 has been fabricated. The method used was a doctor blade. The concentration of the additive was varied. The membranes were characterized using FT-IR, XRD, SEM and EIS. XRD analysis showed that the crystallinity index increased by the addition of ZrO 2 . The presence of functional groups in between lithium salts and polymer interaction investigated by FTIR analysis. The morphology of the membrane surface was identified by SEM analysis. SEM image and mapping showed the morphology of the membrane have typical porous layer. The electrical conductivity increased by the additions of ZrO 2 .

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 m 2 /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. AbstrakSintes Serbuk Halus LiBOB untuk Meningkatkan Kelarutannya. Senyawa Litium Bis (Oksalato) Borat atau LiBOB mulai banyak diteliti, karena dapat dipergunakan untuk elektrolit pada baterai lithium. Senyawa tersebut mudah disintesis dan dianggap lebih ramah lingkungan dari pada material elektrolit lainnya karena tidak mengandung unsur halogen. Pada penelitian ini dilakukan pembuatan serbuk halus LiBOB. Pembuatan serbuk halus LiBOB bertujuan untuk memudahkan kelarutan LiBOB pada pembuatan elektrolit cair dan memperlancar pergerakan ion dari anoda menuju katoda sehingga meningkatkan kinerja elektrolit. Metode yang digunakan adalah reaksi padat-padat. Sintesis senyawa LiBOB, melalui reaksi antara asam oksalat dihidrat, lithium hidroksida monohidrat dengan asam borat. Serbuk yang dihasilkan kemudian dihaluskan dengan teknik ball milling dengan waktu yang bervariasi(0, 6, 10 dan 13) jam. Selanjutnya sampel dianalisis struktur mikro meliputi fasa yang terbentuk, ikatan gugus, morfologi permukaan butir, luas permukaan butiran, volume pori, waktu kelarutan dan konduktivitas listrik. Dari analisa tersebut didapatkan hasil fasa yang terbentuk adalah LiBOB dan LiBOB hidrat, tidak terjadi perubahan fasa selama proses milling, indeks kristalinitas perubahan menjadi lebih kecil dan tidak terjadi perubahan ikatan gugus karena pengaruh proses milling. Luas permukaan butiran terbesar didapat 83,111 m 2 /g, dengan volum pori 1,21311e+02 A pada m...