A Fluorination Method for Improving Cation-Disordered Rocksalt Cathode Performance

Ahn, Juhyeon; Chen, Dongchang; Chen, Guoying

doi:10.1002/aenm.202001671

A Fluorination Method for Improving Cation-Disordered Rocksalt Cathode Performance

Journal Article · Tue Jul 28 00:00:00 EDT 2020 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.202001671· OSTI ID:1783131

Ahn, Juhyeon ^[1]; Chen, Dongchang ^[1]; ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In Li-rich cation-disordered rocksalt oxide cathodes (DRX), partial fluorine substitution in the oxygen anion sublattice can increase the capacity contribution from transition-metal (TM) redox while reducing that from the less reversible oxygen redox. To date, limited fluorination substitution has been achieved by introducing LiF precursor during the solid-state synthesis. To take full advantage of the fluorination effect, however, a higher F content is desired. In the present study, the successful use of a fluorinated polymeric precursor is reported to increase the F solubility in DRX and the incorporation of F content up to 10–12.5 at% into the rocksalt lattice of a model Li-Mn-Nb-O (LMNO) system, largely exceeding the 7.5 at% limit achieved with LiF synthesis. Higher F content in the fluorinated-DRX (F-DRX) significantly improves electrochemical performance, with a reversible discharge capacity of ≈255 mAh g^–1 achieved at 10 at% of F substitution. After 30 cycles, up to a 40% increase in capacity retention is achieved through the fluorination. Overall, the study demonstrates the feasibility of using a new and effective fluorination process to synthesize advanced DRX cathode materials.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1783131

Alternate ID(s):: OSTI ID: 1643953

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 35 Vol. 10; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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