Ion association tailoring SEI composition for Li metal anode protection

He, Yitao; Zhang, Yaohui; Yu, Peng; Ding, Fei; Li, Xifei; Wang, Zhihong; Lv, Zhe; Wang, Xianjie; Liu, Zhiguo; Huang, Xiao

doi:10.1016/j.jechem.2019.09.033

Cited by 55 publications

(13 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon could be attributed to the difference in the SEI composition. It has been reported in our previous research work that the addition of lithium perchlorate could increase the content of LiF in the SEI (Figure S4), which was beneficial to accelerate the transmission rate of Li + in the SEI and improve the CE. The CE of the Li–Cu cell using the electrolyte of 1 M LiTFSI EC-DEC with 7% LiClO 4 could reach >98.0% and its cycling life (>150 cycles) was markedly improved in comparison with that of the control electrolyte (30 cycles) without LiClO 4 (the test results are shown in Figure S5).…”

Section: Resultsmentioning

confidence: 64%

“…These two reasons needed to be unified through the microscopic mechanisms to obtain the methods for the formation of dendrite-free Li metal. Besides, although studying dendrite-free Li metal has been focused currently on the preparation of protective materials, such as protective membranes, 12 additives, 13 and hosts, 14 the relationships between the dendrite-free morphologies and the electrochemical performances of the Li metal anode need to be further explored in order to fill the research gap. Through analyzing the result of our experiments, it is found that dendrite-free Li metal does not always increase the CE.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the Relationships between Morphology, Solid Electrolyte Interphase Composition, and Coulombic Efficiency of Lithium Metal

Fan

Wang

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Traditionally, dendrite growth is considered to be one of the reasons leading to poor performance of lithium metal. However, it is found that the growth of dendrites does not necessarily reduce the Coulombic efficiency (CE) of lithium metal. Here, the relationships among morphologies, solid electrolyte interphase (SEI) composition, and the CE of lithium metal have been systematically studied. By comparing different kinds of morphologies of lithium metal and the electrolytes, we discovered that SEI composition showed a great influence on the CE of lithium metal owing to the enhanced desolvation of the SEI by ionic compounds such as lithium fluoride and lithium nitride. In addition, we further developed a new method using electrochemical impedance spectroscopy of the symmetric Li− Li cell to study the properties of the SEI.

show abstract

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Understanding the Relationships between Morphology, Solid Electrolyte Interphase Composition, and Coulombic Efficiency of Lithium Metal

Fan

Wang

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…Independent of the applied temperature, the cells show low and random values for the CE and no trend in the degradation behavior is evident. The cells with LiTFSI also frequently show values above the theoretical maximum value of η CE > 1, which is a sign of the inhomogeneous, poor and weak SEI formation potential of LiTFSI salt [24]. This might be because of the lower LiF content formed during the degradation of LiTFSI, which plays a major role in stabilizing the cell performance, resulting in a longer cycle life [25].…”

Section: Influence Of Salt Concentration and Temperaturementioning

confidence: 95%

Influence of Temperature and Electrolyte Composition on the Performance of Lithium Metal Anodes

et al. 2021

View full text Add to dashboard Cite

Lithium metal anodes have again attracted widespread attention due to the continuously growing demand of cells with higher energy density. However, the lithium deposition mechanism and the affecting process of influencing factors, such as temperature, cycling current density, and electrolyte composition are not fully understood and require further investigation. In this article, the behavior of lithium metal anode at different temperatures (25, 40, and 60 ∘C), lithium salts, electrolyte concentrations (1 and 2 M), and the applied cell current (equivalent to 0.5 C, 1 C, and 2 C). is investigated. Two different salts were evaluated: lithium bis(fluorosulfonyl)imide (LiFSI) and lithium bis(trifluoromethanesul-fonyl)imide (LiTFSI). The cells at a medium temperature (40 ∘C) show the highest Coulombic efficiency (CE). However, shorter cycle life is observed compared to the experiments at room temperature (25 ∘C). Regardless of electrolyte type and C-rate, the higher temperature of 60 ∘C provides the worst Coulombic efficiency and cycle life among those at the examined temperatures. A higher C-rate has a positive effect on the stability over the cycle life of the lithium cells. The best performance in terms of long cycle life and relatively good Coulombic efficiency is achieved by fast charging the cell with high concentration LiFSI in 1,2-dimethoxyethane (DME) electrolyte at a temperature of 25 ∘C. The cell has an average Coulombic efficiency of 0.987 over 223 cycles. In addition to galvanostatic experiments, Electrochemical Impedance Spectroscopy (EIS) measurements were performed to study the evolution of the interface under different conditions during cycling.

show abstract

“…[31][32][33][34] The composite SEI with inorganic LiF, Li 3 N, Li 2 O, Li 2 S 2 O 4 and C 2 F x Li y formed by reduction reaction of LiTFSI promoted by LiClO 4 additive effectively inhibited the side reaction between Li anode and electrolyte. [35] And Li alloys can lower the Li deposited overpotential and extend the cycle life by forming a solid solution. [36] Organic artificial SEI with various structure and components were also fabricated on Li anode as protection layer.…”

Section: Sei Componentsmentioning

confidence: 99%

Artificial Solid‐Electrolyte Interphase for Lithium Metal Batteries

Kang

Xiao

Lemmon

2020

Batteries & Supercaps

View full text Add to dashboard Cite

Li metal has attracted intense attention due to its high specific capacity, but the dendrite growth during cycling impedes its practical application as a rechargeable anode. To improve the stability of the solid‐electrolyte interphase (SEI) on Li metal is the key to develop Li anode with high safety. In native SEI, inorganics act as fast ion channels and organics play the role of soft base with high flexibility to buffer volume change. However, the SEI with inorganics close to Li surface and organics close to electrolyte always leads to a fragile structure, resulting in repeatedly breaking and growing of the surface layer. Artificial SEI is one of the most effective ways to improve interphase stability and extend the cycle life of Li anode. Inorganics such as Li fluoride, Li nitride, Li phosphate and Li alloys have been widely applied in Li protection. In situ chemical reactions, spin coating and doctor blade coating of organics were also conducted to obtain SEI with high lithiophilic functional groups and high elasticity. To fabricate an ideal artificial SEI, organic and inorganic components should be rearranged as a rational structure to possess synergetic effects with both high flexibility and ionic conductivity. This Minireview summarizes the most recent works on artificial SEI and discusses the electrochemical performance of different components as interphase, aiming to inspire the study on designing and fabricating stable Li anode with robust interphase structure.

show abstract

Ion association tailoring SEI composition for Li metal anode protection

Cited by 55 publications

References 32 publications

Understanding the Relationships between Morphology, Solid Electrolyte Interphase Composition, and Coulombic Efficiency of Lithium Metal

Understanding the Relationships between Morphology, Solid Electrolyte Interphase Composition, and Coulombic Efficiency of Lithium Metal

Influence of Temperature and Electrolyte Composition on the Performance of Lithium Metal Anodes

Artificial Solid‐Electrolyte Interphase for Lithium Metal Batteries

Contact Info

Product

Resources

About