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

Shi, Pengcheng; Zhang, Linchao; Xiang, Hongfa; Liang, Xin; Sun, Yi; Xu, Wu

doi:10.1021/acsami.8b05185

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

Journal Article · Wed Jun 13 00:00:00 EDT 2018 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.8b05185· OSTI ID:1457041

Shi, Pengcheng ^[1]; Zhang, Linchao ^[2]; ^[3]; Liang, Xin ^[3]; Sun, Yi ^[3]; ^[4]

Hefei Univ. of Technology, Anhui (China); Pacific Northwest National Laboratory
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Chinese Academy of Sciences, Anhui (China)
Hefei Univ. of Technology, Anhui (China)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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 (LiPO₂F₂, 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 LiPF₆-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_1/3O₂ 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.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Contributing Organization:: Hefei University of Technology, Pacific Northwest National Laboratory

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1457041

Alternate ID(s):: OSTI ID: 1578076

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 26 Vol. 10; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (8)

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