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Journal : International Journal of Renewable Energy Development

Experimental and DFT investigation of LiFePO₄/graphene composites prepared via shear exfoliation route Amri, Amun; Mawaddah, Mawaddah; Alfatlian, Alfatlian; Sunarno, Sunarno; Murdiya, Fri; Assylzhan, Mazhibayev; Jumbri, Khairulazhar; Altarawneh, Mohammednoor; Yang, Chun-Chen; Saputro, Sulistyo; Rahman, M Mahbubur
International Journal of Renewable Energy Development Vol 15, No 2 (2026): March 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61976

Abstract

The performance of LiFePO₄ (LFP) cathodes was successfully enhanced by incorporating two types of graphene obtained through green and low-cost liquid shear exfoliation processes. Commercial LFP was combined with few-layer graphene (FLG) and very few-layer graphene (VFLG), with compositions ranging from 0-4 wt.%. LFP, LFP/FLG, and LFP/VFLG, were characterized using electrochemical impedance spectroscopy (EIS), charge–discharge (CD), XRD, FTIR, and FESEM–EDX. Density functional theory (DFT) calculations were further employed to probe the electronic structure of LFP and an idealized LFP(001)/pristine-graphene interface as a baseline model for interfacial electronic coupling. DFT indicated interfacial charge redistribution and the emergence of C-2p π-derived states near the Fermi level, resulting in bandgap narrowing relative to pristine LFP and suggesting an additional electronic percolation pathway at the interface. Experimentally, EIS showed that VFLG reduced charge-transfer resistance and increased effective electrochemical conductivity, while FLG addition was associated with improved interfacial charge-transfer behavior inferred from EIS. CD tests at 0.5 C showed that the 4 wt.% FLG and 4 wt.% VFLG electrodes delivered the highest specific capacities of 29.98 mAh/g and 44.66 mAh/g, corresponding to increases of 81.9% and 170.5% compared to bare LFP. XRD and FTIR confirmed that LFP phase integrity was maintained, and FESEM–EDX revealed a uniform particle distribution with well-dispersed graphene networks. Overall, these results demonstrated that shear-exfoliated graphene effectively improved electronic connectivity and charge-transfer behavior in LFP cathodes, supported by consistent electrochemical measurements and electronic-structure insights from DFT.
Co-Authors Abda Abda Adi Mahesa, Miranti Adi Setiawan Agustina Ahmad Muzakki AHMADI Aisah Siregar, Siti Rodina Aisyah, Rizka Al Denis, Siti Diva Alfatlian, Alfatlian Alrudi Yansah, Alrudi Altarawneh, Mohammednoor Alvingkan , Syndy Alwi Alwi Amelia Putri, Ine Aminsyah, Agus Amun Amri Ananda, Fitria Anastasya, Aqila Andina Halimsyah Rambe Anggraini, Hafizah Anjaliyatul Luaily Anjeliani, Silvi Annisa, Nor Anthon Monde Aprillia, Raihan Aprizkiyandari, Siti Arathusa, Nazhifa Syifana Arifah Nuril Maufiroh Ariyadi, Samsul Armita, Dwi Ajeng Asry, Shofia Assylzhan, Mazhibayev Aufa, Aufa Aurelia, Nayla Azahra, Diva Azmi, Muhammad Haikal Azura, Putri Zalfa Banurea, Alinuddin Budi Anna Keliat Budianti, Yusnaili Bunda, Dias Permata Cahyani, Chairunnisa Chandra, Yudi Ariesta Dilla Agustin Dinarafqiya, Dinarafqiya Dita, Dita Dita, Rahma Een Endasari Erfendy, Ulfa evendi, evendi Fadillah, Muhammad Arief Fahrurrozi Fahrurrozi Falah, Andy Makarim Fauzi Ahmad Muda Fauziah Fauziah Febriyanti Dwi Wulandari Firmawati, Asri Nur Fitria, Dilla Fitria, Irma Fitria, Ona Fitriyani Fitriyani Franchika, Tri Mulia Fredy Saputra, M. Khalid Frendi Fri Murdiya, Fri Gesta, Lara Gusneli Gusneli Gustiani, Gustiani Hana, Nabila Handa, Adrian Hanum OK, Azizah Harahap, Nursalsabilah Harahap, Reni Agustina Harapan, Edi Harjawati, Tri Hasanah, Annisa Hasibuan, Ahmad Tarmizi Hidayati, Awanis Hilwa, Zaitun Ida Ayu Putu Sri Widnyani Ikrimah, Ikrimah IMRO’AH, NURFITRI Indaryani Indaryani, Indaryani Indriyanti Indriyanti, Indriyanti Jain, Vishal Jakiatin Nisa, Jakiatin Jamaludin M Sakung Juliana, Rina Jumahir, Jumahir Jumbri, Khairulazhar Karim Karim, Karim Kartika Sunardi, Putri Khamim, Siti Khan, Naseer A. Kholifah Kholifah Koba'a, Hasna Kudratul Alam, Ilham Lahada, Akmal M. Lailatussaadah M Nur, Lailatussaadah Larasati, Suci Lenggogeni, Devia Putri Lestari, Enti Linda Fitria Luaily, Anjaliyatul Lubis, Dumasari M. Fikri Jaka Pratama Maharani, Blangi Intan Mahendra, Jihan Goldaren Manisha, Manisha Mardiyah, Atika Maria Ulfa Marini Kristina Situmeang Maritta Sari Martheda Maarang Marto, L. Syaidiman Marwah Marwah Masruroh MASRUROH Masyhuri Masyhuri Maulana, Adha Maulandia, Siti Mayseni, Boditta Mbele, Siti Hartina Mentari Mentari, Mentari MIFTAKHUL JANNAH Misnawati Misnawati Monikha, Sri Ayu Muchfazillah, Nafhiza Muhammad Jufri MUHAMMAD SHOLEH Muhammad Syaifullah, Muhammad Mulyanti Mulyanti Muslim Muslim Muslin, Muslin Muyessaroh, Muyessaroh Naila Shaliha, Cut Raisha Nasution, Sopiah Widia Rahma Natasya Natasya Nduru, Fandi Saputra Nengke Puspita Sari Nikmah, Shofiatun Nila Kesumawati Nova Nova Novitasari, Mistati Nur Afni Safarina, Nur Afni NUR AINI Nurdiansyah, Yohan Nurhayati Usman Nuri Silviati Nurjarina, Nurjarina Nursoleha, Risma nurul khotimah Pagiu, Salapu Paramita, Nadya Paramitha, Bella Parmin, Joria Permatasari, Ica Popi Radyuli Pradana, M. Nata Prambudi, Panji Satria Prihatin, Silverius Djuni Purnama, Tri Bayu Puspita, Rema Putri, Almia Permata Putri, Kinanti Rizki Putri, Rabitha Minfadlih Qadrun Nada Rachma Hasibuan rahman, Fathurrahman Rahman, M Mahbubur Rajagukguk, Arisya Raudhati, Sri Ridan Muhtadi Rijali, Ahmad Rismawati Rismawati Risnajayanti, Risnajayanti Rizka Wahyu Utami Rosmaida Sinaga Ruqoyyah Fitri Rusandi, Ferri Rustandy, Andy Sabila, Hidayatis Sadiq, Muhammad Rauuf Salma Hayati Samheri, Samheri Sanawati, Sanawati Saputri, Adinda Dwi Sari, Diana Fauzia Setyadi, Cecep Silaban, Martin Dennise Simanulang, Risky Siregar, Humayrani Siska Iskandar Sofyan A. Gani Soroinsong, Wulan Patria SRI RAHAYU Sri Sugiarti Sri Wahyuni Sriani Subkih, Ahmad Sulastri Sulastri Sulisna, Aida Sulistiana, Umi Sulistyo Saputro Sunarno Sunarno Susfa Yetti, Susfa Susmiati Susmiati Syarif Hidayat, Ahmad Tanjung, Azzahra Ulinnuha, Muhammad Ustman, Najamudin Ali Utami, Nadila Dwi Vrylia, Khazra Putika Wandari, Ayu Winda Lidiyana Windy Lubis, Citra Wirda Wirda Yang, Chun-Chen Yantoro Yossie Susanti Eka Putri Yuisman, Dedi Zahyuni, Violita Zuhrinal M. Nawawi Zulnazri, Z Zulpaerah