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Direct Observation of Defect‐Aided Structural Evolution in a Nickel‐Rich Layered Cathode

Journal Article · · Angewandte Chemie
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [5];  [8];  [7];  [9];  [10]
  1. Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial Technologies Wenzhou University Wenzhou Zhejiang 325027 China, Department of Chemical Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada, Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
  2. Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA, Department of Chemistry and Department of Computer Science University of Toronto Toronto Ontario M5S 3H6 Canada
  3. Energy and Environment Directorate Pacific Northwest National Laboratory 902 Battelle Boulevard Richland WA 99352 USA, College of Chemistry and Chemical Engineering Xiamen University Xiamen Fujian 361005 China
  4. State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xian 710072 China
  5. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA
  6. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
  7. Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial Technologies Wenzhou University Wenzhou Zhejiang 325027 China
  8. National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
  9. Department of Chemical Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada
  10. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA, National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
Abstract

Ni‐rich LiNi 1− x − y Mn x Co y O 2 (NMC) layered compounds are the dominant cathode for lithium ion batteries. The role of crystallographic defects on structure evolution and performance degradation during electrochemical cycling is not yet fully understood. Here, we investigated the structural evolution of a Ni‐rich NMC cathode in a solid‐state cell by in situ transmission electron microscopy. Antiphase boundary (APB) and twin boundary (TB) separating layered phases played an important role on phase change. Upon Li depletion, the APB extended across the layered structure, while Li/transition metal (TM) ion mixing in the layered phases was detected to induce the rock‐salt phase formation along the coherent TB. According to DFT calculations, Li/TM mixing and phase transition were aided by the low diffusion barriers of TM ions at planar defects. This work reveals the dynamical scenario of secondary phase evolution, helping unveil the origin of performance fading in Ni‐rich NMC.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1664570
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 49 Vol. 132; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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