The effect of electrolyte additives on electrochemical performance of silicon/mesoporous carbon (Si/MC) for anode materials for lithium-ion batteries

Rezqita, Arlavinda; Sauer, Markus; Foelske, Annette; Kronberger, Hermann; Trifonova, Atanaska

doi:10.1016/j.electacta.2017.06.128

Cited by 74 publications

(62 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The major obstacles of Si‐based anodes are illustrated in Figure . The SEI develops at the anode surface since traditional electrolytes are unstable at the anode low operating potential during charging …”

Section: Challenges Of Si‐based Anodes and Strategies To Address Themmentioning

confidence: 99%

“…The continual volume fluctuations during Li insertion/extraction favor the formation of unstable SEI layers on the Si surface, which leads to the rapid consumption of Li ions and electrolyte, conductivity degradation, and finally the rapid capacity fading during the initial cycles and poor initial coulombic efficiencies (CEs) . Moreover, the continuous SEI growth increases the total anode electrical resistance and also impedes Li‐ion diffusion throughout the anode material …”

Section: Challenges Of Si‐based Anodes and Strategies To Address Themmentioning

confidence: 99%

See 1 more Smart Citation

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Challenges Of Si‐based Anodes and Strategies To Address Themmentioning

confidence: 99%

Section: Challenges Of Si‐based Anodes and Strategies To Address Themmentioning

confidence: 99%

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This leaves the possibility of increased diffusion of the Na + ion if water is added;t his occurs most likely through the structural rearrangement mechanism because the vehicular diffusion mechanism would be associated with viscosity. More insight can be found in the 23 Na chemical shift changes ( Figure 4) presented as af unctiono ft emperature between À10 and 80 8Cf or different concentrations of water.T he higher water concentration (10 000 ppm) showed ad ownfield chemicals hift (a decrease in the magnetic shielding) suggestive of less electron density around the 23 Na cation. This suggests that the addition of water changes the coordination environmenta rounds odium.…”

Section: Diffusion Nmr and Chemical Shift Analysismentioning

confidence: 99%

“…This suggests that the addition of water changes the coordination environmenta rounds odium. The full width at half maximum (FWHM, Dn)o ft he 23 Na peak shown in Figure S2 in the Supporting Information is inversely relatedt ot he T 2 relaxation, linked mainly to local mobility and also to the exchange rate between chemical sites. For each sample there are two distinct regions,asseen in previous studies.…”

Section: Diffusion Nmr and Chemical Shift Analysismentioning

confidence: 99%

“…[16] Additives are often introduced to the electrolyte to tune electrolyte properties and device performances uch as the alkali ion or the compositiono ft he solid electrolyte interphase (SEI), as well as altering other characteristics. [17][18][19][20][21] Additives for lithium batteries have been extensively studied;f or example, they can improve cycle lifea th igher temperatures, [8,22] keep the internal resistance low, [22,23] and extend the cycle life. [8] Sodium battery electrolyte additives, however,h ave been less studied.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Water as an Effective Additive for High‐Energy‐Density Na Metal Batteries? Studies in a Superconcentrated Ionic Liquid Electrolyte

et al. 2019

View full text Add to dashboard Cite

The effect of water on the properties of superconcentrated sodium salt solutions in ionic liquids (ILs) was investigated to design electrolytes for sodium battery applications with water as an additive. Water was added to a 50 mol % solution of NaFSI [FSI=bis(fluorosulfonyl)imide] in the ionic liquid N‐methyl‐N‐propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI). Although the thermal properties (e.g., glass transition temperature) showed little dependence on the water content, the viscosity and, in particular, the ionic conductivity were strongly affected. The Na|Na symmetrical cell cycling performance was strongly dependent on the applied current density as well as on the water content. At higher current densities (1.0 mA cm−2) the polarization profiles showed a water dependence, suggesting that water was actively involved in the formation of an improved solid electrolyte interface layer (SEI) for high‐water‐content samples (1000–5000 ppm), resulting in improved long‐term cycling stability. The initial impedance of cells cycled at 1.0 mA cm−2 (measured after 20 cycles) was elevated after water addition, and large polarizations occured for the “wet” samples. However, with further cycling the wet cells began to exhibit lower polarization and improved stability compared to the “dry” sample. The Na|NaFePO4 cell cycling performance was also demonstrated with minimal effect on the cell capacity, further highlighting the negligible activity of water in these electrolyte systems. In fact, reduced cell polarization and a more clearly defined charge profile were evident after water addition. The work shown here suggests that water may be used as a convenient and inexpensive additive for superconcentrated sodium IL electrolytes for improved device performance.

show abstract

Silicon‐Based Anodes for Advanced Lithium‐Ion Batteries

Song

Zhang

2019

Encyclopedia of Inorganic and Bioinorganic Chemistry

View full text Add to dashboard Cite

The society's growing demand on long‐range electrical vehicles and long‐life consumer electronics put urgent requirement on the development of advanced lithium‐ion batteries (LIBs) of high energy and low cost. Si, with top abundance and highest theoretical capacity to lithium, is expected to bump the LIB's energy density to above 300 Wh kg −1 at a relatively low cost. Over the past 2 decades, tremendous effort has been made in bringing Si‐based anode materials to the battery market. In this book article, we review the progress from three fundamental aspects: (i) Si nanostructure design; (ii) binder study; and (iii) electrolyte optimization and interphase engineering. We address the practical aspects of Si‐based anode materials and remaining challenges with a special focus on the full cell configuration. We hope the short walkthrough of the Si technology will help the readers have a quick grasp of the efforts made in improving the performance of Si‐based anodes and appreciate the outcomes of the fundamental research brought to the development of practical LIBs.

show abstract

The effect of electrolyte additives on electrochemical performance of silicon/mesoporous carbon (Si/MC) for anode materials for lithium-ion batteries

Cited by 74 publications

References 35 publications

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

Water as an Effective Additive for High‐Energy‐Density Na Metal Batteries? Studies in a Superconcentrated Ionic Liquid Electrolyte

Silicon‐Based Anodes for Advanced Lithium‐Ion Batteries

Contact Info

Product

Resources

About