Structural and Functional Analysis of Surface Film on Li Anode in Vinylene Carbonate-Containing Electrolyte

Ota, Hitoshi; Sakata, Yuuichi; Otake, Yumiko; Shima, Kunihisa; Ue, Makoto; Yamaki, Jun‐ichi

doi:10.1149/1.1798411

Cited by 134 publications

(117 citation statements)

References 38 publications

Supporting

Mentioning

111

Contrasting

Order By: Relevance

“…The C1s spectra for the electrode plated from EC:EMC contains peaks characteristic of Li 2 CO 3 or lithium alkyl carbonates at 290 eV 31,32 along with a C-O peak at 686.7 eV, consistent with the IR spectra. The XPS spectrum of the electrode plated from 5% VC electrolyte, is very different and contains intense peaks at 291 and 288 eV characteristic of Poly(VC) in the SEI, 26 which is also consistent with IR spectra. The O1s XPS spectra of Li plated with the EC:EMC and 5% VC electrolytes are provided in Figure 5.…”

Section: Resultssupporting

confidence: 73%

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells

Brown

Jurng

Lucht

2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The influence of vinylene carbonate (VC) on the plating/stripping of lithium was investigated using Cu||LiFePO 4 cells. These cells allow for easy fabrication and in-situ generation of lithium, with no excess lithium to influence performance. Addition of VC to the electrolyte improves both capacity retention and efficiency. IR and XPS spectroscopy of the surface of the plated lithium suggests the presence of a significant amount of poly(VC) when the electrolyte (1.2 M LiPF 6 in ethylene carbonate (EC): ethyl methyl carbonate (EMC) (3:7, vol)) contains 5% of added VC. This suggests employing additives that generate polymeric species on the surface of lithium improves plating/stripping performance in carbonate electrolytes. The plating and stripping of the lithium metal negative electrode in non-aqueous electrolytes has been investigated for decades.1-3 In particular, carbonate solvents have relatively high voltage stability, making them desirable electrolytes for high-energy density lithium batteries.3-6 However, the efficiency of plating/stripping lithium in carbonate electrolytes does not meet requirements for commercial application (> 99.9%). 7,8 It is common to measure the plating/stripping efficiency of lithium by assembling Li||Cu cells. [9][10][11][12][13] In this cell design, a small amount of Li is cycled, with an excess reservoir of lithium present. One limitation of this cell design is the difficulty of controlling the design and construction of the solid electrolyte interphase 14 (SEI) on lithium, as the low reduction potential of the lithium metal electrode present during cell construction will cause immediate reaction with electrolyte upon exposure. Thus, a reaction between the electrolyte and the lithium metal electrode will occur before cycling begins. Further, the excess lithium within the cell can significantly increase the cycle life of the cell making it difficult to compare to commercial cells, with a limited supply of lithium.Contrary to Li||Cu cells, Cu||LiFePO 4 cells have air-stable components, facilitating their processing and assembly. 15,16 Further, the in-situ formation of lithium metal and low reactivity of LiFePO 4 ensures additives under investigation do not react with the electrode surface upon construction and are only reduced upon initial cycling. This affords the possibility for controlled design and construction of the SEI on lithium metal since the reduction of the electrolyte can be controlled by current density, cell potential, and the quantity of lithium plated. Finally, given that there is no excess lithium in Cu||LiFePO 4 cells, any observed improvements in capacity retention, Coulombic efficiency, or impedance should be applicable to other lithium metal based battery systems.Vinylene carbonate (VC) is a well known electrolyte additive for lithium-ion batteries, demonstrating exceptional performance for graphite and several cathode materials. [17][18][19][20][21][22][23][24] Further, the reaction products of VC with lithium have been investigated in detail, using Li||Ni ...

show abstract

Section: Resultssupporting

confidence: 73%

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells

Brown

Jurng

Lucht

2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…15 The VC forms a polymeric species and improves the cycling efficiency of lithium deposition and dissolution. 19 Despite of these works, it is not well understood that how these additives form the SEI layers and how the SEI affects to the surface morphology of the lithium metal yet. In the present study, an ethylene carbonate (EC)-based electrolyte solution was chosen as a normal electrolyte, because the EC-based electrolyte solution forms a good SEI layer on the graphite anode.…”

Section: Introductionmentioning

confidence: 99%

Surface Layer and Morphology of Lithium Metal Electrodes

et al. 2016

View full text Add to dashboard Cite

The surface morphology of the electrodeposited lithium metal from electrolyte solutions containing electrolyte additives: fluoroethylene carbonate (FEC), vinylene carbonate (VC) and lithium bis(oxalate)borate (LiBOB), were investigated. All the film forming additive improved the surface morphology. The FEC especially shows the most uniform surface morphology compared with the other electrolyte additives and the additive-free electrolyte. The surface analyses of the lithium metal were conducted using X-ray photoelectron spectroscopy (XPS) and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The analytical study revealed that the FEC suppresses the decomposition of the PF 6 − anion, resulting in the formation of a thin stable SEI layer on the lithium metal.

show abstract

“…We also present here data for the thermal decomposition of lithium methyl carbonate, which can be useful in understanding thermal studies of passive films on lithium or carbon anodes in lithium batteries 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Lithium Methyl Carbonate as a Reaction Product of Metallic Lithium and Dimethyl Carbonate

Zhuang

Yang

Ross

et al. 2006

Electrochemical and Solid-State Letters

View full text Add to dashboard Cite

Structural and Functional Analysis of Surface Film on Li Anode in Vinylene Carbonate-Containing Electrolyte

Cited by 134 publications

References 38 publications

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells

Surface Layer and Morphology of Lithium Metal Electrodes

Lithium Methyl Carbonate as a Reaction Product of Metallic Lithium and Dimethyl Carbonate

Contact Info

Product

Resources

About

Structural and Functional Analysis of Surface Film on Li Anode in Vinylene Carbonate-Containing Electrolyte

Cited by 134 publications

References 38 publications

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO4Cells

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO4Cells

Surface Layer and Morphology of Lithium Metal Electrodes

Lithium Methyl Carbonate as a Reaction Product of Metallic Lithium and Dimethyl Carbonate

Contact Info

Product

Resources

About

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells

Investigation of the Lithium Solid Electrolyte Interphase in Vinylene Carbonate Electrolytes Using Cu||LiFePO₄Cells