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This content will become publicly available on June 13, 2019

Title: Lithium Difluorophosphate as a Dendrite-Suppressing Additive for Lithium Metal Batteries

Here, the notorious lithium (Li) dendrites and the low Coulombic efficiency (CE) of Li anode are two major obstacles to the practical utilization of Li metal batteries (LMBs). Introducing a dendrite-suppressing additive into nonaqueous electrolytes is one of the facile and effective solutions to promote the commercialization of LMBs. Herein, Li difluorophosphate (LiPO 2F 2, LiDFP) is used as an electrolyte additive to inhibit Li dendrite growth by forming a vigorous and stable solid electrolyte interphase film on metallic Li anode. Moreover, the Li CE can be largely improved from 84.6% of the conventional LiPF 6-based electrolyte to 95.2% by the addition of an optimal concentration of LiDFP at 0.15 M. The optimal LiDFP-containing electrolyte can allow the Li||Li symmetric cells to cycle stably for more than 500 and 200 h at 0.5 and 1.0 mA cm –2, respectively, much longer than the control electrolyte without LiDFP additive. Meanwhile, this LiDFP-containing electrolyte also plays an important role in enhancing the cycling stability of the Li||LiN i1/3Co 1/3Mn 1/3O 2 cells with a moderately high mass loading of 9.7 mg cm –2. These results demonstrate that LiDFP has extensive application prospects as a dendrite-suppressing additive in advanced LMBs.
 [1] ;  [2] ; ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [3]
  1. Hefei Univ. of Technology, Anhui (China)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Chinese Academy of Sciences, Anhui (China)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Name: ACS Applied Materials and Interfaces; Journal ID: ISSN 1944-8244
American Chemical Society (ACS)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Contributing Orgs:
Hefei University of Technology, Pacific Northwest National Laboratory
Country of Publication:
United States
25 ENERGY STORAGE; electrolyte additive; lithium dendrite suppression; lithium difluorophosphate; lithium metal battery; solid electrolyte interphase
OSTI Identifier: