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Title: Surface-modified Li[Li0.2Ni0.17Co0.07Mn0.56]O2 nanoparticles with MgF2 as cathode for Li-ion battery

Li-rich layered materials hold lots of promise as cathode for next-generation high performance Li-ion batteries. Here, surface-modified layer-structured Li[Li0.2Ni0.17Co0.07Mn0.56]O2 (Li-rich) nanoparticles are employed as cathode for Li storage and transport studies. Moreover, our results demonstrate that 1 wt.% MgF2-modified Li-rich electrode exhibits the best cycling capability, with capacity retention ratio of 86% after 50 cycles, much higher than that of pristine one (only 66%). In the meantime, the 1 wt.% MgF2 surface modified Li-rich electrode shows superior rate performance and thermal abuse treatments as well. Subsequent investigation indicates that the coated MgF2 layer can suppress the undesirable growth of solid electrolyte interphase (SEI) film and enhance the structure stability upon cycling. Finally, this coating technique provides the potentially rewarding avenue towards the development of high capacity Li-ion cathodes.
Authors:
 [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:
1287011
Grant/Contract Number:
AC05-00OR22725; 50902044; 2015AA034201; 2012IRTSTHN004; 124200510004; 201308410027
Type:
Accepted Manuscript
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Volume: 278; Journal Issue: C; Journal ID: ISSN 0167-2738
Publisher:
Elsevier
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; 36 MATERIALS SCIENCE MgF2; Surface coating; Li[Li0.2Ni0.17Co0.07Mn0.56]O-2; Li-ion battery; RECHARGEABLE LITHIUM BATTERIES; CYCLING STABILITY; HIGH-CAPACITY; ELECTROCHEMICAL PROPERTIES; PERFORMANCE IMPROVEMENT; ANOMALOUS CAPACITY; LICOO2 CATHODE; ELECTRODES; MN; GRAPHITE