TY - JOUR

T1 - Enhanced lithium ionic conductivity of lithium perchlorate in the metal-organic framework matrix

AU - Ulihin, Artem

AU - Ponomareva, Valentina

AU - Uvarov, Nikolai

AU - Kovalenko, Konstantin

AU - Fedin, Vladimir

PY - 2020/12

Y1 - 2020/12

N2 - Nanocomposite solid electrolytes were prepared by impregnation of LiClO4 into pores of the metal-organic framework Cr3[C6H4(COO)2]3F (MIL-101(Cr)), and their conductivity was investigated. At temperatures 25–150 °C and relative humidity of 50%, the composites easily absorb water with formation liquid phase in the pores and have conductivity values typical for water solutions. Conductivity decreases with diminishing the humidity; however, complete dehydration may be achieved only after prolonged heating in vacuum at 180 °C. The concentration dependence of conductivity of dehydrated samples goes through the maximum at nearly 6 mol% of MIL-101(Cr) and reaches 3 × 10−3 S/cm at 160 °C; the activation energy decreases in the nanocomposites. Using the volt-amperometric technique on the sample with two nickel electrodes, the electrochemical decomposition voltage value was found to be nearly 3.5 V at 160 °C. It suggests that the ionic conductivity is caused by lithium cations rather than protons or electrons.

AB - Nanocomposite solid electrolytes were prepared by impregnation of LiClO4 into pores of the metal-organic framework Cr3[C6H4(COO)2]3F (MIL-101(Cr)), and their conductivity was investigated. At temperatures 25–150 °C and relative humidity of 50%, the composites easily absorb water with formation liquid phase in the pores and have conductivity values typical for water solutions. Conductivity decreases with diminishing the humidity; however, complete dehydration may be achieved only after prolonged heating in vacuum at 180 °C. The concentration dependence of conductivity of dehydrated samples goes through the maximum at nearly 6 mol% of MIL-101(Cr) and reaches 3 × 10−3 S/cm at 160 °C; the activation energy decreases in the nanocomposites. Using the volt-amperometric technique on the sample with two nickel electrodes, the electrochemical decomposition voltage value was found to be nearly 3.5 V at 160 °C. It suggests that the ionic conductivity is caused by lithium cations rather than protons or electrons.

KW - Decomposition voltage

KW - Effect of humidity on conductivity

KW - High lithium ion conductivity

KW - Metal-organic frameworks

KW - MIL-101(Cr)

KW - Nanocomposite solid electrolytes

KW - OXIDE

KW - VAPOR ADSORPTION

KW - MIL-101(CR)

KW - CONDUCTORS

KW - COMPOSITE SOLID ELECTROLYTES

KW - KINETICS

KW - RECENT PROGRESS

UR - http://www.scopus.com/inward/record.url?scp=85091004386&partnerID=8YFLogxK

U2 - 10.1007/s11581-020-03772-6

DO - 10.1007/s11581-020-03772-6

M3 - Article

AN - SCOPUS:85091004386

VL - 26

SP - 6167

EP - 6173

JO - Ionics

JF - Ionics

SN - 0947-7047

IS - 12

ER -