title: Synthesis of Reduced Graphene Oxide-Modified LiMn0.75Fe0.25PO4 Microspheres by Salt-Assisted Spray Drying for High-Performance Lithium-Ion Batteries.
abstract: Microsized, spherical, three-dimensional (3D) graphene-based composites as electrode materials exhibit improved tap density and electrochemical properties. In this study, we report 3D LiMn0.75Fe0.25PO4/reduced graphene oxide microspheres synthesized by one-step salt-assisted spray drying using a mixed solution containing a precursor salt and graphene oxide and a subsequent heat treatment. During this process, it was found that the type of metal salt used has significant effects on the morphology, phase purity, and electrochemical properties of the synthesized samples. Furthermore, the amount of the chelating agent used also affects the phase purity and electrochemical properties of the samples. The composite exhibited a high tap density (1.1 g cm(-3)) as well as a gravimetric capacity of 161 mA h g(-1) and volumetric capacity of 281 mA h cm(-3) at 0.05 C-rate. It also exhibited excellent rate capability, delivering a discharge capacity of 90 mA h g(-1) at 60 C-rate. Furthermore, the microspheres exhibited high energy efficiency and good cyclability, showing a capacity retention rate of 93% after 1000 cycles at 10 C-rate.
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.
authors.forename: Myeong-Seong
authors.initials: MS
authors.lastname: Kim
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.|Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
authors.forename: Hyun-Kyung
authors.initials: HK
authors.lastname: Kim
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.
authors.forename: Suk-Woo
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.|Center for Energy Convergence Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Dong-Hyun
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.
authors.forename: Dianbo
authors.initials: D
authors.lastname: Ruan
authors.affiliation: Center for Energy Convergence Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Kyung Yoon
authors.initials: KY
authors.lastname: Chung
authors.affiliation: SkyChem, A-304 Keumkang IT Tower, 215, Galmachiro, Jungwon-gu, Seongnam, 462-901, Republic of Korea.
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Energy Efficient Materials Team, Energy &Environmental Division, Korea Institute of Ceramic Engineering &Technology, 101 Soho-ro, Jinju-si, Gyeongsangnam-do, 660-031, Republic of Korea.
authors.forename: Kwang Chul
authors.initials: KC
authors.lastname: Roh
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, Republic of Korea.
authors.forename: Kwang-Bum
authors.initials: KB
authors.lastname: Kim