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Title: High-Rate Charging Induced Intermediate Phases and Structural Changes of Layer-Structured Cathode for Lithium-Ion Batteries

Using fast time-resolved in situ X-ray diffraction, charge-rate dependent phase transition processes of layer structured cathode material LiNi 1/3Mn 1/3Co 1/3O 2 for lithium-ion batteries are studied. During first charge, intermediate phases emerge at high rates of 10C, 30C, and 60C, but not at low rates of 0.1C and 1C. These intermediate phases can be continuously observed during relaxation after the charging current is switched off. After half-way charging at high rate, sample studied by scanning transmission electron microscopy shows Li-rich and Li-poor phases' coexistence with tetrahedral occupation of Li in Li-poor phase. Also, the high rate induced overpotential is thought to be the driving force for the formation of this intermediate Li-poor phase. The in situ quick X-ray absorption results show that the oxidation of Ni accelerates with increasing charging rate and the Ni 4+ state can be reached at the end of charge with 30C rate. Finally, these results give new insights in the understanding of the layered cathodes during high-rate charging.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [3] ;  [3] ;  [3] ;  [6] ;  [6] ;  [2] ;  [3]
  1. Fudan Univ., Shanghai (China). Department of Materials Science; Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Chemistry
  2. Fudan Univ., Shanghai (China). Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Department of Chemistry & Laser Chemistry Institute
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Chemistry
  4. Chinese Academy of Sciences (CAS), Beijing (China). Laboratory for Advanced Materials & Electron Microscopy, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics
  5. Dongguk University-Seoul, Seoul (Republic of Korea). Department of Energy and Materials Engineering
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II
Publication Date:
Report Number(s):
BNL-112452-2016-JA
Journal ID: ISSN 1614-6832; R&D Project: MA453MAEA; VT1201000
Grant/Contract Number:
SC0012704; AC02-98CH10886; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 21; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; National Synchrotron Light Source II
OSTI Identifier:
1336072