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Title: Structural integrity—Searching the key factor to supress the voltage fade of Li-rich layered cathode materials through 3D X-ray imaging and spectroscopy techniques

Li-rich layered materials are important cathode compounds used in commercial lithium ion batteries, which, however, suffers from some drawbacks including the so-called voltage fade upon electrochemical cycling. This study employs novel transmission X-ray microscopy to investigate the electrochemical reaction induced morphological and chemical changes in the Li-rich Li2Ru0.5Mn0.5O3 cathode particles at the meso to nano scale. Combined X-ray spectroscopy, diffraction and microscopy experiments are performed to systematically study this cathode material's evolution upon cycling as well as to establish a comprehensive understanding of the structural origin of capacity fade through 2D and 3D fine length scale morphology and heterogeneity change of this material. This work suggests that atomic manipulation (e.g. doping, substitution etc.) or nano engineering (e.g. nano-sizing, heterogeneous structure) are important strategies to mitigate the internal strain and defects induced by extensive lithium insertion/extraction. In conclusion, it also shows that maintaining the structural integrity is the key in designing and synthesizing lithium-rich layered materials with better cycle stability.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [4] ;  [7] ;  [6]
  1. Donghua Univ., Shanghai (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. UCSF, San Francisco, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Donghua Univ., Shanghai (China)
  6. Chinese Academy of Sciences, Beijing (China)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences, Beijing (China)
Publication Date:
Report Number(s):
BNL-112630-2016-JA
Journal ID: ISSN 2211-2855; PII: S2211285516303275
Grant/Contract Number:
51325206; SC0012704; AC02-76SF00515; AC02-06CH11357; SC00112704
Type:
Published Article
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 28; Journal Issue: C; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; lithium-ion batteries; cathode; lithium rich layered oxides; voltage fade; transmission X-ray microscopy
OSTI Identifier:
1310829
Alternate Identifier(s):
OSTI ID: 1311766; OSTI ID: 1326739