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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[Li 0.2Ni 0.17Co 0.07Mn 0.56]O 2 nanoparticles are surface-modified with AlF 3 through a facile chemical deposition method. The AlF 3 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% AlF 3-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 AlF 3 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:
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 Lab. (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
OSTI Identifier:
1287012