Title: Unlocking iron metal as a cathode for sustainable Li-ion batteries by an anion solid solution

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [8]
  1. Oregon State University, Corvallis, OR (United States); Oregon State University
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Vanderbilt University, Nashville, TN (United States)
  4. Oregon State University, Corvallis, OR (United States); Seoul National University (Korea, Republic of)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Stanford University, CA (United States)
  7. Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  8. Oregon State University, Corvallis, OR (United States)
  9. University of Maryland, College Park, MD (United States)

Traditional cathode chemistry of Li-ion batteries relies on the transport of Li-ions within the solid structures, with the transition metal ions and anions acting as the static components. Here, we demonstrate that a solid solution of F and PO43– facilitates the reversible conversion of a fine mixture of iron powder, LiF, and Li3PO4 into iron salts. Notably, in its fully lithiated state, we use commercial iron metal powder in this cathode, departing from electrodes that begin with iron salts, such as FeF3. Our results show that Fe-cations and anions of F and PO43– act as charge carriers in addition to Li-ions during the conversion from iron metal to a solid solution of iron salts. This composite electrode delivers a reversible capacity of up to 368 mAh/g and a specific energy of 940 Wh/kg. Our study underscores the potential of amorphous composites comprising lithium salts as high-energy battery electrodes.

Research Organization:
Oregon State University, Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; SC0012704; SC0023408
OSTI ID:
2340919
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 21 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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