A distilled-water assisted solid-state method for preparing LiFePO4 using α-Fe2O3 as the iron source

Ding, Keqiang; Li, Wenjuan; Jia, Haitao

doi:10.1134/s1023193512110055

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Antifluorite structure-based oxides such as Li 5 FeO 4 and Li 6 CoO 4 also have much potential as high-capacity cathode materials because of their rich lithium content. Their cathode performances were first reported in 1999, and subsequently, the electrochemical performances of these types of species and the analyses of the relevant redox reactions have been widely reported. − In Li 5 FeO 4 , the transformation to disordered rocksalt Li 3 FeO 3.5 proceeds, whereas in Li 6 CoO 4 , the transformations to Li 4 CoO 4 , or CoO 2 are feasible, by the extraction of two Li ions. However, in each case, reversibility is poor, resulting in discharge capacity contributed by a one-electron reaction, which is due to only TM redox.…”

Section: Introductionmentioning

confidence: 99%

Cation-Disorder-Assisted Reversible Topotactic Phase Transition between Antifluorite and Rocksalt Toward High-Capacity Lithium-Ion Batteries

Kobayashi

Tsukasaki

Ogasawara

et al. 2020

ACS Appl. Mater. Interfaces

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Multielectron reaction electrode materials using partial oxygen redox can be potentially used as cathodes in lithium-ion batteries, as they offer numerous advantages, including high reversible capacity and energy density and low cost. Here, a reversible three-electron reaction is demonstrated utilizing topotactic phase transition between antifluorite and rocksalt in a cation-disordered antifluorite-type cubic Li 6 CoO 4 cathode. This cubic phase is synthesized by a simple mechanochemical treatment of conventionally prepared tetragonal Li 6 CoO 4 . It displays a reversible capacity of 487 mAh g −1 , a high value because of a reversible three-electron reaction using Co 2+ /Co 3+ , Co 3+ /Co 4+ , and O 2− /O 2 2− redox, occurring without O 2 gas evolution. The mechanochemical treatment is assumed to reduce its lattice distortion by cation-disordering and facilitate a reversible topotactic phase transition between antifluorite and rocksalt structures via a dynamic cation pushing mechanism.

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