title: Organic-acid-assisted fabrication of low-cost Li-rich cathode material (Li[Li1/6Fe1/6Ni1/6Mn1/2]O2) for lithium-ion battery.
abstract: A novel Li-rich cathode Li[Li1/6Fe1/6Ni1/6Mn1/2]O2 (0.4Li2MnO3-0.6LiFe1/3Ni1/3Mn1/3O2) was synthesized by a sol-gel method, which uses citric acid (SC), tartaric acid (ST), or adipic acid (SA) as a chelating agent. The structural, morphological, and electrochemical properties of the prepared samples were characterized by various methods. X-ray diffraction showed that single-phase materials are formed mainly with typical α-NaFeO2 layered structure (R3̅m), and the SC sample has the lowest Li/Ni cation disorder. The morphological study indicated homogeneous primary particles in good distribution size (100 nm) with small aggregates. The Fe, Ni, and Mn valences were determined by X-ray absorption near-edge structure analysis. In coin cell tests, the initial reversible discharge capacity of an SA electrode was 289.7 mAh g(-1) at the 0.1C rate in the 1.5-4.8 V voltage range, while an SC electrode showed a better cycling stability with relatively high capacity retention. At the 2C rate, the SC electrode can deliver a discharge capacity of 150 mAh g(-1) after 50 cycles. Differential capacity vs voltage curves were employed to further investigate the electrochemical reactions and the structural change process during cycling. This low-cost, Fe-based compound prepared by the sol-gel method has the potential to be used as the high capacity cathode material for Li-ion batteries.
authors.affiliation: School of Chemical Engineering and the Environment, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
authors.forename: Taolin
authors.initials: T
authors.lastname: Zhao
authors.forename: Shi
authors.initials: S
authors.lastname: Chen
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Zhang
authors.forename: Huiming
authors.initials: H
authors.lastname: Wu
authors.forename: Tianpin
authors.initials: T
authors.lastname: Wu
authors.forename: Cheng-Jun
authors.initials: CJ
authors.lastname: Sun
authors.forename: Renjie
authors.initials: R
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.forename: Khalil
authors.initials: K
authors.lastname: Amine
keywords: Fe-based; cathode material; lithium-rich; lithium−ion battery; low-cost; sol−gel method