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Densification of Cathode/Electrolyte Interphase to Enhance Reversibility of LiCoO2 at 4.65 V

Journal Article · · Advanced Materials
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  1. Peking University, Shenzhen (China)
  2. Tsinghua Univ., Shenzhen (China)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. Jiangsu University (China)
+ Show Author Affiliations
For LiCoO2 (LCO) operated beyond 4.55 V (vs Li/Li+), it usually suffers from severe surface degradation. Constructing a robust cathode/electrolyte interphase (CEI) is effective to alleviate the above issues, however, the correlated mechanisms still remain vague. Herein, a progressively reinforced CEI is realized via constructing Zr-O deposits (ZrO2 and Li2ZrO3) on LCO surface (i.e., Z-LCO). Upon cycle, these Zr-O deposits can promote the decomposition of LiPF6, and progressively convert to the highly dispersed Zr-O-F species. In particular, the chemical reaction between LiF and Zr-O-F species further leads to the densification of CEI, which greatly reinforces its toughness and conductivity. Further, combining the robust CEI and thin surface rock-salt layer of Z-LCO, several benefits are achieved, including stabilizing the surface lattice oxygen, facilitating the interface Li+ transport kinetics, and enhancing the reversibility of O3/H1-3 phase transition, etc. As a result, the Z-LCO||Li cells exhibit a high capacity retention of 84.2% after 1000 cycles in 3–4.65 V, 80.9% after 1500 cycles in 3–4.6 V, and a high rate capacity of 160 mAh g-1 at 16 C (1 C = 200 mA g-1). This work provides a new insight for developing advanced LCO cathodes.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2566847
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 40 Vol. 36; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
Li-ion batteries
Zr─O deposits
cathode/electrolyte interphase
high-voltage LiCoO2
interface reaction