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Structure design enables stable anionic and cationic redox chemistry in a T2-type Li-excess layered oxide cathode

Journal Article · · Science Bulletin
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [2];  [6]
  1. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Univ. of Tsukuba (Japan)
  2. Univ. of Illinois, Chicago, IL (United States)
  3. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  4. Zhengzhou University (China)
  5. Nanjing Univ. (China)
  6. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Nanjing Univ. (China)
Coupled with anionic and cationic redox chemistry, Li-rich/excess cathode materials are prospective high-energy-density candidates for the next-generation Li-ion batteries. However, irreversible lattice oxygen loss would exacerbate irreversible transition metal migration, resulting in a drastic voltage decay and capacity degeneration. Herein, a metastable layered Li-excess cathode material, T2-type Li0.72[Li0.12Ni0.36Mn0.52]O2, was developed, in which both oxygen stacking arrangement and Li coordination environment fundamentally differ from that in conventional O3-type layered structures. By means of the reversible Li migration processes and structural evolutions, not only can voltage decay be effectively restrained, but also excellent capacity retention can be achieved upon long-term cycling. Moreover, irreversible/reversible anionic/cationic redox activities have been well assigned and quantified by various in/ex-situ spectroscopic techniques, further clarifying the charge compensation mechanism associated with (de)lithiation. These findings of the novel T2 structure with the enhanced anionic redox stability will provide a new scope for the development of high-energy-density Li-rich cathode materials.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1981748
Alternate ID(s):
OSTI ID: 1862571
Journal Information:
Science Bulletin, Journal Name: Science Bulletin Journal Issue: 4 Vol. 67; ISSN 2095-9273
Publisher:
Elsevier; Science China PressCopyright Statement
Country of Publication:
United States
Language:
English

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