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Uncommon Behavior of Li Doping Suppresses Oxygen Redox in P2-Type Manganese-Rich Sodium Cathodes

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [4];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [5];  [6];  [3];  [2];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Harvard Univ., Cambridge, MA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Dongguk Univ., Seoul (Korea, Republic of)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Argonne National Lab. (ANL), Lemont, IL (United States); Stanford Univ., CA (United States)
Utilizing both cationic and anionic oxygen redox reactions is regarded as an important approach to exploit high-capacity layered cathode materials with earth abundant elements. It has been popular strategies to effectively elevate the oxygen redox activities by Li-doping to introduce unhybridized O 2p orbitals in NaxMnO2-based chemistries or enabling high covalency transition metals in P2-Na0.66MnxTM1-xO2 (TM = Fe, Cu, Ni) materials. Here, we investigated the effect of Li doping on regulating the oxygen redox activities P2-structured Na0.66Ni0.25Mn0.75O2 materials. Systematic X-ray characterizations and ab initio simulations have shown that the doped Li has uncommon behavior in modulating the density of states of the neighboring Ni, Mn and O, leading to the suppression of the existing oxygen and Mn redox reactivities and the promotion of the Ni redox. Furthermore, the findings provide a complementary scenario to current oxygen redox mechanisms and shed lights on developing new routes for high-performance cathodes.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Electricity (OE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office, Battery Materials Research (BMR) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; AC05-76RL01830
OSTI ID:
1878593
Alternate ID(s):
OSTI ID: 1829126
OSTI ID: 1962541
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 52 Vol. 33; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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