Abstract:
:Recent progress in the understanding of percolation theory points to cation-disordered lithium-excess transition metal oxides as high-capacity lithium-ion cathode materials. Nevertheless, the oxygen redox processes required for these materials to deliver high capacity can trigger oxygen loss, which leads to the formation of resistive surface layers on the cathode particles. We demonstrate here that, somewhat surprisingly, fluorine can be incorporated into the bulk of disordered lithium nickel titanium molybdenum oxides using a standard solid-state method to increase the nickel content, and that this compositional modification is very effective in reducing oxygen loss, improving energy density, average voltage, and rate performance. We argue that the valence reduction on the anion site, offered by fluorine incorporation, opens up significant opportunities for the design of high-capacity cation-disordered cathode materials.The performance of lithium-excess cation-disordered oxides as cathode materials relies on the extent to which the oxygen loss during cycling is mitigated. Here, the authors show that incorporating fluorine is an effective strategy which substantially improves the cycling stability of such a material.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Lee J,Papp JK,Clément RJ,Sallis S,Kwon DH,Shi T,Yang W,McCloskey BD,Ceder Gdoi
10.1038/s41467-017-01115-0subject
Has Abstractpub_date
2017-10-17 00:00:00pages
981issue
1issn
2041-1723pii
10.1038/s41467-017-01115-0journal_volume
8pub_type
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