High‐Entropy and Superstructure‐Stabilized Layered Oxide Cathodes for Sodium‐Ion Batteries

Abstract Layered transition metal oxides are appealing cathodes for sodium‐ion batteries due to their overall advantages in energy density and cost. But their stabilities are usually compromised by the complicated phase transition and the oxygen redox, particularly when operating at high voltages, leading to poor structural stability and substantial capacity loss. Here an integrated strategy combing the high‐entropy design with the superlattice‐stabilization to extend the cycle life and enhance the rate capability of layered cathodes is reported. It is shown that the as‐prepared high‐entropy Na 2/3 Li 1/6 Fe 1/6 Co 1/6 Ni 1/6 Mn 1/3 O 2 cathode enables a superlattice structure with Li/transition metal ordering…

• NS
  National Science Foundation

  Awards: DMR-2011967, DMR‐2011967, CHE-1338173, DE-AC02-06CH11357, DE-SC0012704, 1338173
• UD
  U.S. Department of Energy

  Awards: DE‐SC0012704, AC02-06CH11357, No. DE-SC0012704, SC0012704, DE-AC02, 06CH11357, DE-AC02-06CH11357, DE-AC02-
• UI
  UC Irvine Materials Research Institute

  Award: DMR-2011967
• OO
  Office of Science

  Awards: DE-AC02-06CH11357, No. DE-SC0012704, DE-AC02, Contract No. DE-SC0012704, 06CH11357, SC0012704, AC02-06CH11357, DE-SC0012704
• OO
  Office of Energy Efficiency and Renewable Energy

  Awards: AC02-06CH11357, DE-AC02-06CH11357, DE-SC0012704
• UO
  University of California, Irvine

  Award: DMR-2011967
• DO
  Division of Materials Research

  Awards: DMR-2011967, DE-AC02-06CH11357, CHE-1338173, 2011967
• DO
  Division of Chemistry

  Awards: CHE-1338173, 1338173
• BE
  Basic Energy Sciences

  Award: DE‐AC02‐76SF00515
• OO
  Office of Energy Efficiency
• AN
  Argonne National Laboratory

  Awards: DE-AC02, DE-SC0012704, 06CH11357, AC02-06CH11357, DE‐AC02‐06CH11357
• BN
  Brookhaven National Laboratory

  Awards: SC0012704, No. DE-SC0012704, DE‐SC0012704, Contract No. DE-SC0012704, DE-AC02-06CH11357