A renewable membrane with high ionic conductivity and thermal stability for Li-ion batteries

ABSTRACTGarnet-type electrolytes are currently receiving much attention for applications in Li-ion batteries, as they possess high ionic conductivity and chemical stability. Doping the garnet structure has proved to be a good way to improve the Li ion conductivity and stability. The present study includes effects of Y- doping in Li5La3Nb2O12 on Li ion conductivity and stability of “Li5+2xLa3Nb2-xYxO12” (0.05 ≤ x ≤ 0.75) under various environments, as well as chemical stability studies of Li5+xBaxLa3-xM2O12 (M = Nb, Ta) in water. “Li6.5La3Nb1.25Y0.75O12” showed a very high ionic conductivity of 2.7 х 10−4 Scm−1 at 25 °C, which is comparable to the highest value reported for garnet-type compounds, e.g., Li7La3Zr2O12. The selected members show very good stability against high temperatures, water, Li battery cathode Li2CoMn3O8 and carbon. The Li5+xBaxLa3-xNb2O12 garnets have shown to readily undergo an ion-exchange (proton) reaction under water treatment at room temperature; however, the Ta-based garnet appears to exhibit considerably higher stability under the same conditions.

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Natural halloysite nanotubes-coated polypropylene membrane as dual-function separator for highly safe Li-ion batteries with improved cycling and thermal stability

Electrochimica Acta ◽

10.1016/j.electacta.2021.138182 ◽

2021 ◽

Vol 379 ◽

pp. 138182

Author(s):

Ying Xie ◽

Xiaofei Chen ◽

Kai Han ◽

Xiang Xiong

Keyword(s):

Thermal Stability ◽

Halloysite Nanotubes ◽

Dual Function ◽

Li Ion Batteries ◽

Polypropylene Membrane ◽

Li Ion

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Investigating the Factors Affecting the Ionic Conduction in Nanoconfined NaBH4

Inorganics ◽

10.3390/inorganics9010002 ◽

2021 ◽

Vol 9 (1) ◽

pp. 2

Author(s):

Xiaoxuan Luo ◽

Aditya Rawal ◽

Kondo-Francois Aguey-Zinsou

Keyword(s):

Ionic Conductivity ◽

Ionic Conduction ◽

Metal Hydrides ◽

Ionic Conductivities ◽

Effective Strategy ◽

Li Ion Batteries ◽

Large Cage ◽

Factors Affecting ◽

Li Ion ◽

Mcm 41

Nanoconfinement is an effective strategy to tune the properties of the metal hydrides. It has been extensively employed to modify the ionic conductivity of LiBH4 as an electrolyte for Li-ion batteries. However, the approach does not seem to be applicable to other borohydrides such as NaBH4, which is found to reach a limited improvement in ionic conductivity of 10−7 S cm−1 at 115 °C upon nanoconfinement in Mobil Composition of Matter No. 41 (MCM-41) instead of 10−8 S cm−1. In comparison, introducing large cage anions in the form of Na2B12H12 naturally formed upon the nanoconfinement of NaBH4 was found to be more effective in leading to higher ionic conductivities of 10−4 S cm−1 at 110 °C.

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