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Exploring High‐Energy Li‐I(r)on Batteries and Capacitors with Conversion‐Type Fe 3 O 4 ‐rGO as the Negative Electrode
Author(s) -
Kim HyunKyung,
Aravindan Vanchiappan,
Roh Ms. HaKyung,
Lee Kyujoon,
Jung MyungHwa,
Madhavi Srinivasan,
Roh Kwang Chul,
Kim KwangBum
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700484
Subject(s) - materials science , anode , graphene , cathode , electrode , electrochemistry , oxide , capacitor , energy storage , fabrication , chemical engineering , nanotechnology , metallurgy , voltage , electrical engineering , chemistry , medicine , power (physics) , physics , alternative medicine , engineering , quantum mechanics , pathology
Abstract We report a microwave‐assisted solvothermal process for the preparation of magnetite (Fe 3 O 4 , ca. 5 nm)‐anchored reduced graphene oxide (rGO). It has been examined as a prospective conversion‐type negative electrode for multiple energy storage applications, such as Li‐ion batteries (LIBs) and Li‐ion capacitors (LICs). A LiFePO 4 /Fe 3 O 4 ‐rGO cell is constructed and capable of delivering an energy density of approximately 139 Wh kg −1 with a notable cyclability (ca. 76 %) after 500 cycles. Prior to the fabrication of a LIB, the Fe 3 O 4 ‐rGO is electrochemically pretreated to eliminate the irreversible capacity loss. In addition to the LIB, a high‐energy LIC is also fabricated by using the pre‐lithiated Fe 3 O 4 ‐rGO composite as the anode and commercial activated carbon as the cathode. This LIC registered a maximum energy density of approximately 114 Wh kg −1 with good cyclability. For both the LIB and LIC, the mass loading between the electrodes was adjusted based on the performance with metallic Li. The improved electrochemical performance of Fe 3 O 4 ‐rGO over existing materials is a promising development in the quest for novel, fast, low cost, and efficient energy storage systems without compromising the eco‐friendliness