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ACS Nano

ACS Nano

IF: 15.8
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Host–Guest Interactions of Metal–Organic Framework Enable Highly Conductive Quasi-Solid-State Electrolytes for Li–CO2 Batteries

Published:7 December 2024 DOI: 10.1021/acsnano.4c12712
De-Hui Guan, Xiao-Xue Wang, Cheng-Lin Miao, Jia-Xin Li, Jian-You Li, Xin-Yuan Yuan, Xin-Yue Ma, Ji-Jing Xu

Abstract

High-energy lithium (Li)-based batteries, especially rechargeable Li–CO2 batteries with CO2 fixation capability and high energy density, are desirable for electrified transportation and other applications. However, the challenges of poor stability, low energy efficiency, and leakage of liquid electrolytes hinder the development of Li–CO2 batteries. Herein, a highly conductive and stable metalorganic framework-encapsulated ionic liquid (IL@MOF) electrolyte system is developed for quasi-solid-state Li–CO2 batteries. Benefiting from the host–guest interaction of MOFs with open micromesopores and internal IL, the optimized IL@MOF electrolytes exhibit a high ionic conductivity of 1.03 mS cm–1 and a high transference number of 0.80 at room temperature. The IL@MOF electrolytes also feature a wide electrochemical stability window (4.71 V versus Li+/Li) and a wide working temperature (?60 °C ~ 150 °C). The IL@MOF electrolytes also enable Li+ and electrons transport in the carbon nanotubes-IL@MOF (CNT-IL@MOF) solid cathodes in quasi-solid-state Li–CO2 batteries, delivering a high specific capacity of 13,978 mAh g–1 (50 mA g–1), a long cycle life of 441 cycles (500 mA g–1 and 1000 mAh g–1), and a wide operation temperature of ?60 to 150 °C. The proposed MOF-encapsulated IL electrolyte system presents a powerful strategy for developing high-energy and highly safe quasi-solid-state batteries.

Substances (3)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Methanol 67-56-1 CH4O 838 suppliers $9.00-$7620.00
Ethanol 64-17-5 C2H6O 809 suppliers $10.00-$17310.00
Terephthalic acid 100-21-0 C8H6O4 634 suppliers $6.00-$3418.80

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