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Title: AlF 3 Surface-Coated Li[Li 0.2 Ni 0.17 Co 0.07 Mn 0.56 ]O 2 Nanoparticles with Superior Electrochemical Performance for Lithium-Ion Batteries

For Li-rich layered cathode materials considerable attention has been paid owing to their high capacity performance for Li-ion batteries (LIBs). In our work, layered Li-rich Li[Li0.2Ni0.17Co0.07Mn0.56]O2 nanoparticles are surface-modified with AlF3 through a facile chemical deposition method. The AlF3 surface layers have little impact on the structure of the material and act as buffers to prevent the direct contact of the electrode with the electrolyte; thus, they enhance the electrochemical performance significantly. The 3 wt% AlF3-coated Li-rich electrode exhibits the best cycling capability and has a considerably enhanced capacity retention of 83.1% after 50 cycles. Moreover, the rate performance and thermal stability of the 3 wt% AlF3-coated electrode are also clearly improved. Finally, surface analysis indicates that the AlF3 coating layer can largely suppress the undesirable growth of solid electrolyte interphase (SEI) film and, therefore, stabilizes the structure upon cycling.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3]
  1. Henan Univ., Kaifeng (China)
  2. Henan Univ., Kaifeng (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. McGill Univ., Montreal, QC (Canada)
Publication Date:
OSTI Identifier:
1287012
Grant/Contract Number:
AC05-00OR22725; 50902044; 2015AA034201; 2012IRTSTHN004; 124200510004
Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 8; Journal Issue: 15; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE batteries; fluorides; nanoparticles; sol-gel processes; surface analysis; SOLID-SOLUTION CATHODES; SECONDARY BATTERIES; COMPOSITE CATHODE; CYCLING STABILITY; LICOO2 CATHODE; HIGH-CAPACITY; LI; ELECTRODES; IMPROVEMENT; OXIDE