Abstract
Fast Li+solid ion conductors are a key component of all-solid-state batteries, a technology currently under development. The possible use of metallic lithium as active material in solid-state batteries warrants a quantum step improvement of battery specific energy, enabling further electric vehicles application. Hereby, we report the synthesis and ion conduction properties of a new solid hybrid electrolyte based on the MIL-121 metal organic framework (MOF) structure. After an ion exchange procedure that introduces Li+in the structure, a known quantity of a soaking electrolyte is incorporated. The soaking electrolyte is based on the EMIM-TFSI ionic liquid, thus we can classify our formulation as a MOF–ionic liquid hybrid solid electrolyte. Electrical conductivity is investigated by impedance spectroscopy and preliminary studies of ion dynamics are conducted by7Li NMR. The field of MOF-based ion conductors remains in incipient stages of research. Our report paves the way towards the rational design of new solid-state ion conductors.
Highlights
Energy storage is one of the key technological challenges of our society
In this report we investigate the use of an ionic liquid, namely 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI) as a soaking electrolyte in a MIL-121 metal organic framework (MOF) that was functionalized with Li+ cations
We found that by the addition of an ionic liquid or an ionic liquidbased Li+ electrolyte, the DC conductivity of the MOF materials increase by eight orders of magnitude
Summary
Energy storage is one of the key technological challenges of our society. Unsurprisingly, many research efforts are oriented towards advanced battery systems. (Kim et al, 2019). Many research efforts are oriented towards advanced battery systems. There are major interests in finding solid electrolytes with high conductivity; (Zhang et al, 2018; Zhao et al, 2019); on the long term they are considered better alternatives to the current liquid electrolytes used in commercial Li-ion battery systems. The use of metallic lithium as an active material would be desired as a high capacity replacement for graphite. Higher capacity materials would be required to further improve the specific energy of batteries. In spite of 40 years of research, it remains hitherto impractical to use Li metal anodes with liquid electrolytes in rechargeable lithium cells. Li dendrite growth and pulverisation of the anode upon repeated stripping and plating cycles are preventing the use of metallic lithium in batteries with liquid electrolyte. Li dendrite growth and pulverisation of the anode upon repeated stripping and plating cycles are preventing the use of metallic lithium in batteries with liquid electrolyte. (Zheng J. et al, 2020)
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