Advances and issues in developing salt-concentrated battery electrolytes

Yamada, Yuki; Wang, Jianhui; Ko, Seongjae; Watanabe, Eriko; Yamada, Atsuo

doi:10.1038/s41560-019-0336-z

Cited by 1,308 publications

(1,130 citation statements)

References 104 publications

Supporting

Mentioning

1,107

Contrasting

Unclassified

Order By: Relevance

“…As shown in Figure S22 (Supporting Information), by incorporating only 2% Al in the ultrahigh-Ni layered oxide (LiNi 0.94 Co 0.06 O 2 ) to give LiNi 0.92 Co 0.06 Al 0.02 O 2 , the capacity retention of full cells significantly increases from 47% to 83% after 1000 cycles. Besides Al doping strategy, the application of the emerging innovative electrolyte system such as high-concentrated electrolyte, [73][74][75] ethylene carbonatefree electrolyte [76,77] is also a prospective direction to stabilize the ultrahigh-Ni layered oxide system. Thus, by incorporating only 2% Al, the cyclability of the ultrahigh-Ni layered oxide could be promoted to a level comparable to that of LiNi 0.8 Co 0.1 Mn 0.1 O 2 .…”

Section: Stabilization Of Ultrahigh-ni Layered Oxidesmentioning

confidence: 99%

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

Manthiram

2019

Advanced Energy Materials

146

111

View full text Add to dashboard Cite

Ultrahigh‐Ni layered oxides hold great promise as high‐energy‐density cathodes at an affordable cost for lithium‐ion batteries, yet their practical application is greatly hampered by the poor cyclability. Herein, by employing LiNi0.94Co0.06O2 as a model cathode in a full‐cell configuration, the interphasial and structural evolution processes of ultrahigh‐Ni layered oxides are systematically investigated over the course of their service life (1500 cycles). By applying advanced analytic techniques (e.g., Li‐isotope labeling, region‐of‐interest method), the dynamic chemical evolution on the cathode surface is revealed with spatial resolution, and the correlation between lattice distortion and cathode surface reactivity is established. Benefiting from in situ X‐ray diffraction (XRD) analysis, the ultrahigh‐Ni layered oxide is demonstrated to undergo dual‐phase reaction mechanisms with huge lattice variation, which leads to a decrease in crystallinity and secondary particle pulverization. Furthermore, the critical impact of cathode surface reaction on the graphite anode–electrolyte interphase (AEI) is revealed at nanometer scale, and a universal chemical/physical evolution process of the AEI is illustrated, for the first time. Finally, the practical viability of ultrahigh‐Ni layered oxides is demonstrated through Al‐doping strategy. This work presents a comprehensive understanding of the structural and interphasial degradation of ultrahigh‐Ni layered oxide cathodes for developing high‐energy‐density lithium‐ion batteries.

show abstract

Section: Stabilization Of Ultrahigh-ni Layered Oxidesmentioning

confidence: 99%

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

Manthiram

2019

Advanced Energy Materials

146

111

View full text Add to dashboard Cite

show abstract

“…Recently, a symmetric aqueous high voltage supercapacitor up to 3 V have been demonstrated using concentrated aqueous 1‐butyl‐3‐methylimidazolium chloride ([BMIm]Cl) . In some degree, the extraordinary electrochemical windows mentioned in previous reports are ascribed to increasing the salt concentration in electrolyte could enhance interaction between metal cations and anions/water molecules as well as decrease in the content of free‐state water molecules, effectively inhibits the decomposition of water molecules near the cathode or anode leading to an expanded electrochemical stability window . Nonetheless, although WIS electrolytes demonstrate many advantages that could realize better performance over the conventional dilute electrolytes, which are also accompanied by some shortcomings: low conductivity and high viscosity .…”

Section: Introductionmentioning

confidence: 99%

High‐Performance and Ultra‐Stable Aqueous Supercapacitors Based on a Green and Low‐Cost Water‐In‐Salt Electrolyte

Guo

Zhao

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

The emergence of "water-in-salt" carbon-based supercapacitors presents great potential for further improving the energy density, owing to the extended electrochemical stability window. However, not only low conductivity and high viscosity hinder the superior rate performance, but also the high cost of salts limits their commercialization. Here, we report a low-cost concentrated sodium nitrate electrolyte for high-performance and ultra-stable supercapacitors, based on good electrochemical stability, high conductivity, and low viscosity. In the wide operation voltage range of 0-2.1 V, the constructed symmetric supercapacitor based on commercial active carbon exhibits a high specific capacitance of 32.68 F g À 1 at 1 A g À 1 . Moreover, superior rate capability (83 % capacitance retention from 1 to 20 A g À 1 ) and excellent cycle stability (90 % capacitance retention after 9000 cycles) are also demonstrated. Consequently, this electrolyte system could be the most attractive candidate for promising carbon-based supercapacitors to further improve the energy density.[a] Prof.

show abstract

“…Nevertheless, the KTFSI 0.45 : glyme electrolyte still meets a conductivity value (10 −3 S cm −1 ) feasible for practical applications. In fact, although the KTFSI 0.45 : glyme viscosity is as high as 27.5 mPa s, which could cause difficulties for the electrode wetting, much higher values have been reported for other highly concentrated electrolytes for LIBs . For example, the viscosity of highly concentrated 5.5 M LiFSA/DMC at 30 °C is as high as 240 mPa s .…”

Section: Resultsmentioning

confidence: 99%

Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V₂O₅ Batteries

Liu

Elia

Gao

et al. 2020

Batteries & Supercaps

View full text Add to dashboard Cite

Highly concentrated glyme‐based electrolytes are friendly to a series of negative electrodes for potassium‐based batteries, including potassium metal. However, their compatibility with positive electrodes has been rarely explored. In this work, the influence of the molar fraction of potassium bis(trifluoromethanesulfonyl)imide dissolved in glyme on the cycling ability of K/bilayered‐V2O5 batteries has been investigated. At high salt concentration, the interaction between K+ ions with the glyme is strengthened, leading to a limited number of free glyme molecules. Therefore, the anodic decomposition of the electrolyte solvent, as well as the dissolution of the Al current collectors, is effectively suppressed, resulting in the improved cycling ability of the K/bilayered‐V2O5 cells. In these cells, the positive electrode active material exhibits reversible capacities of 93 and 57 mAh g−1 at specific current densities of 50 and 1000 mA g−1, respectively. After 200 charge‐discharge cycles at 500 mA g−1, the cell retains 94 % of the initial capacity. The promising rate performance and capacity retention demonstrate the importance of proper electrolyte engineering for the K/bilayered‐V2O5 batteries, and the good compatibility of highly concentrated glyme‐based electrolytes with positive electrode materials for potassium batteries.

show abstract

Advances and issues in developing salt-concentrated battery electrolytes

Cited by 1,308 publications

References 104 publications

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

High‐Performance and Ultra‐Stable Aqueous Supercapacitors Based on a Green and Low‐Cost Water‐In‐Salt Electrolyte

Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V₂O₅ Batteries

Contact Info

Product

Resources

About

Advances and issues in developing salt-concentrated battery electrolytes

Cited by 1,308 publications

References 104 publications

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

High‐Performance and Ultra‐Stable Aqueous Supercapacitors Based on a Green and Low‐Cost Water‐In‐Salt Electrolyte

Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V2O5 Batteries

Contact Info

Product

Resources

About

Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V₂O₅ Batteries