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"Peralihan dari energi berbahan dasar fosil menuntut dikembangkannya media penyimpanan energi yang efisien. Li4Ti5O12 (Lithium titanium oksida) atau LTO merupakan bahan material aktif pada anoda baterai Li-ion yang saat ini tengah dikembangkan karena sifat zero strain terhadap volume yang menyebabkan LTO memiliki stabilitas baik. Namun, LTO memiliki konduktivitas serta kapasitas yang perlu ditingkatkan untuk aplikasi-nya sehingga diperlukan penambahan material lain untuk mengatasi permasalahan tersebut. Pada penelitian ini, dilakukan sintesis LTO metode sol-gel dengan variasi suhu (700oC, 800oC dan 900oC) dan variasi penambahan kadar Li (+35%, +40% dan +55%). Analisis SEM dan XRD dilakukan untuk mengetahui karakteristik serbuk LTO. Kemudian, LTO sintesis dengan kemurnian paling optimal dicampur dengan grafena 5% berat untuk mengatasi permasalahan konduktivitas LTO. Pengujian Raman spectroscopy dilakukan untuk meng-analisis ketebalan lapisan grafena. Kemudian, dibuat dua coin cell dengan variasi LTO yang dibandingkan dengan LTO dengan grafena. Baterai kemudian diuji dengan EIS, CV dan CD untuk mengetahui resistivitas dan konduktivitas transfer muatan, kecepatan pengisian serta kapasitas baterai secara berturut-turut. Hasil pengujian ketiganya menunjukkan penambahan grafena belum meningkatkan performa baterai disebabkan eksfoliasi yang belum optimal serta grafena yang belum ter-distribusi dengan baik.

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The shift from fossil-based energy requires the development of efficient energy storage media. Li4Ti5O12 (Lithium titanium oxide) or LTO is the active material in Li-ion battery anode which is currently being developed due to its zero strain to volume change which impacts its good stability. However, LTO has a conductivity and capacity that needs to be improved for its application so another material needs to be added to overcome these problems. In this study, LTO was synthesized using a sol-gel method with variations in temperature (700oC, 800oC and 900oC) and variations in the addition of Li content (+35%, +40% and +55%). SEM and XRD analysis were carried out to determine the characteristics of LTO powder. Then, LTO with the most optimal purity was mixed with 5% wt graphene to solve the conductivity and capacity problem. Raman spectroscopy was performed to analyze the thickness of the graphene layer. Then, two coin cells with LTO variations were made which were compared with LTO with graphene. The battery was then tested with EIS, CV and CD to determine the resistivity and conductivity of charge transfer, charging speed and battery capacity respectively. The results of the tests show that the addition of graphene has not improved battery performance due to non-optimal exfoliation and graphene that has not been well distributed."