Journal
ADVANCED ENERGY MATERIALS
Volume 10, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202001671
Keywords
cation-disordered rocksalt cathodes; fluorinated polymeric precursors; fluorination; lithium-ion batteries; oxygen redox
Categories
Funding
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-76SF00515]
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231]
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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 approximate to 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. The study demonstrates the feasibility of using a new and effective fluorination process to synthesize advanced DRX cathode materials.
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