ABSTRAK
Senyawa metal alloy (LaNi5) biasa digunakan untuk anode baterai Nickel-Metal Hydride (NiMH) karena mampu mengabsorpsi hidrogen dan dapatberoperasi pada kondisi tekanan dan temperatur ruang. Ketika oksida logam tanahjarang ditambahkan ke dalam anode sel baterai NiMH, tidak hanya chargeefficiency dan capacity-retention yang akan meningkat, tetapi juga menjadi rapidcharge dan high power cycling. Penelitian dilakukan untuk melihat karakteristikbahan anode LaNi5 setelah penambahan CeO2 dan proses anil. Metode yangdigunakan adalah mechanical alloying dengan mencampur serbuk LaNi5 denganserbuk CeO2 sebanyak 1%, 2%, dan 3% berat di dalam ball mill selama 120 menitpada putaran 240 rpm. Setelah itu, dilakukan proses anil pada temperatur 300°C,600°C, dan 900°C selama 6 jam di lingkungan gas argon. Kemudian, serbukdikarakterisasi dengan menggunakan XRD, SEM-EDX, dan BET. Pengujianelektrokimia dilakukan dengan menggunakan Electrochemical ImpedanceSpectroscopy (EIS) pada frekuensi 5 mHz ? 100 kHz. Penambahan konsentrasiCeO2 diatas 2%, akan memperkecil volume cell dan mengecilkan diameter pori.Konduktivitas tertinggi yang dicapai pada penelitian ini adalah sebesar 1.5332S/cm dengan diameter pori 0.0082 cc/g. Walaupun penambahan konsentrasi CeO2ke dalam material anode meningkatkan tahanan material, tetapi penambahan 1%CeO2 dapat meningkatkan ketahanan korosi material anode dengan Ecorr sebesar -0.6432 V. Peningkatan temperatur anil menyebabkan perubahan difraksi fasamenjadi fasa NiO dan La2O3 yang menyebabkan konduktivitas menurun dan nilaitahanan semakin besar.

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ABSTRACT
A Lanthanum Nickel compound (LaNi5) is widely used for an anode ofNickel-Metal Hydride (NiMH) battery due to excellence on hydrogen absorptionand good capability to be operated at room temperature and pressure condition.Addition of rare earth oxide to the NiMH has increase charge-retention efficiencyand capacity also has both rapid charge and high power cycling. The experimenthas been conducted to observe the characteristic of the anode LaNi5 materialsafter addition of CeO2 and annealing. As method of this experiment, mechanicalalloying was done by mixed LaNi5 and CeO2 powder which had 1%, 2% and 3%weight mass in ball mill for 120 minutes at 240 rpm. After that, the annealing wascarried out at varied temperature, 300°C, 600°C and 900°C for 6 hours in argongas exposure. Then the powders were characterized with XRD, SEM-EDX, andBET. Electrochemical Impedance Spectroscopy (EIS) was used forelectrochemical testing on the frequency between 5 mHz - 100 kHz. The results ofthis experiment show that increasing CeO2 more than 2% concentration lead todecrease the volume of cells and the pore diameter. Furthermore, this is affect thevalue of ionic conductivity with the highest conductivity is 1.5332 S / cm and0.0082 cc / g in diameter pore. Although the addition of CeO2 concentration intothe anode material increases the resistance, the addition of 1% CeO2 can improvethe corrosion resistance of the anode material with Ecorr of -0.6432 V. Inconclusions, annealing temperature increasing will changes diffraction phase withthe dominant phase NiO and La2O3, thus the conductivity was decreasing and theresistance was increasing.