Highly concentrated carbonate electrolyte for Li-ion batteries with lithium metal and graphite anodes

Xie, Jian; Patra, Jagabandhu; Rath, Purna Chandra; Liu, Weng Jing; Su, Ching Yuan; Lee, Sheng Wei; Tseng, Chung Jen; Gandomi, Yasser Ashraf; Chang, Jeng Kuei

doi:10.1016/j.jpowsour.2019.227657

Cited by 38 publications

(40 citation statements)

References 36 publications

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“…These results are presumably ascribed to the viscosity increase of the electrolyte with increasing salt concentration, decreasing the ionic conductivity at the initial cycle (Fig. 5 and Table S1) [44]. However, after the 50 th Li plating, it showed the opposite trend showing that the R i decreased as the salt concentration increased (Fig.…”

Section: Resultsmentioning

confidence: 91%

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

Choi

Bae

Lee

et al. 2022

J. Electrochem. Sci. Technol

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ANODE-free Li-metal batteries (AFLMBs) operating with Li of cathode material have attracted enormous attention due to their exceptional energy density originating from anode-free structure in the confined cell volume. However, uncontrolled dendritic growth of lithium on a copper current collector can limit its practical application as it causes fatal issues for stable cycling such as dead Li formation, unstable solid electrolyte interphase, electrolyte exhaustion, and internal short-circuit. To overcome this limitation, here, we report a novel dual-salt electrolyte comprising of 0.2 M LiPF 6 + 3.8 M lithium bis(fluorosulfonyl)imide in a carbonate/ester co-solvent with 5 wt% fluoroethylene carbonate, 2 wt% vinylene carbonate, and 0.2 wt% LiNO 3 additives. Because the dual-salt electrolyte facilitates uniform/dense Li deposition on the current collector and can form robust/ionic conductive LiF-based SEI layer on the deposited Li, a Li/Li symmetrical cell exhibits improved cycling performance and low polarization for over 200 h operation. Furthermore, the anode-free LiFePO 4 /Cu cells in the carbonate electrolyte shows significantly enhanced cycling stability compared to the counterparts consisting of different salt ratios. This study shows an importance of electrolyte design guiding uniform Li deposition and forming stable SEI layer for AFLMBs.

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Section: Resultsmentioning

confidence: 91%

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

Choi

Bae

Lee

et al. 2022

J. Electrochem. Sci. Technol

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“…On the other hand, the content of the dominant C–O–C species, C O species and oxygen amount distinctly decreased, which could be ascribed to the decreased organic component (possibly ROCOOLi), 27 which may be due to the suppression of electrolyte decomposition. 32 The XPS results indicate that the addition of 0.1 M LiFSI can result in the formation of an inorganic-rich SEI layer. At higher/lower concentrations of LiFSI (0.02 M/0.12 M), the decreased inorganic component seems incapable of imparting a satisfactory Li + interfacial transfer ability and a stable interface, leading to a high interface resistance.…”

Section: Resultsmentioning

confidence: 97%

A novel high-energy-density lithium-free anode dual-ion battery and in situ revealing the interface structure evolution

Wang

Dai

et al. 2022

Chem. Sci.

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“…However, all the IL electrolytes retain good conductivities of >10 −3 S cm −1 , which are comparable to commercial lithium ion battery electrolytes. 42 Even for 1 M LiFSI in [Py 1,4 ]FSI, the conductivity is still 3.8 × 10 −3 S cm −1 .…”

Section: Resultsmentioning

confidence: 99%

In Situ Atomic Force Microscopic Studies of LiFSI-[Py_1,4]FSI Interfacial Nanostructure on Au(111): Solid Electrolyte Interphase and Lithium Underpotential Deposition

et al. 2021

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In this paper, the structure of the LiFSI-[Py1,4]FSI interface on Au(111) was investigated using in situ atomic force microscopy and cyclic voltammetry. Raman and IR vibrational spectroscopy was applied to evaluate the coordination of Li+ ions with the FSI– anion. It was found that [Li(FSI)3]2– species are present in the solutions. The solvation layer number and the forces decrease at higher concentration of Li+ ions. Therefore, the driving force, which is required for the [Li(FSI)3]2– species to pass through the solvation layer to reach the electrode surface, is lowered. This increases the onset potentials of the SEI layer formation and lithium underpotential deposition (Li-UPD) at high Li+ concentrations. It was found that the onset potentials are −0.8, −0.7, −0.6, and −0.4 V for the Li-UPD and −2.0, −1.6, −1.4, and −1.3 V for the SEI layer formation, vs the Pt-(quasi)reference electrode, corresponding to Li+ concentrations of 0.1, 0.25, 0.5, and 1 M, respectively.

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Highly concentrated carbonate electrolyte for Li-ion batteries with lithium metal and graphite anodes

Cited by 38 publications

References 36 publications

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

A novel high-energy-density lithium-free anode dual-ion battery and in situ revealing the interface structure evolution

In Situ Atomic Force Microscopic Studies of LiFSI-[Py_1,4]FSI Interfacial Nanostructure on Au(111): Solid Electrolyte Interphase and Lithium Underpotential Deposition

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Highly concentrated carbonate electrolyte for Li-ion batteries with lithium metal and graphite anodes

Cited by 38 publications

References 36 publications

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

A LiPF6-LiFSI Blended-Salt Electrolyte System for Improved Electrochemical Performance of Anode-Free Batteries

A novel high-energy-density lithium-free anode dual-ion battery and in situ revealing the interface structure evolution

In Situ Atomic Force Microscopic Studies of LiFSI-[Py1,4]FSI Interfacial Nanostructure on Au(111): Solid Electrolyte Interphase and Lithium Underpotential Deposition

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In Situ Atomic Force Microscopic Studies of LiFSI-[Py_1,4]FSI Interfacial Nanostructure on Au(111): Solid Electrolyte Interphase and Lithium Underpotential Deposition