Solid–Liquid Lithium Electrolyte Nanocomposites Derived from Porous Molecular Cages

Abstract

We demonstrate that solid-liquid nanocomposites derived from porous organic cages are effective lithium ion electrolytes at room temperature. A solid-liquid electrolyte nanocomposite (SLEN) fabricated from a LiTFSI/DME electrolyte system and a porous organic cage exhibits ionic conductivity on the order of 1 × 10 S cm. With an experimentally measured activation barrier of 0.16 eV, this composite is characterized as a superionic conductor. Furthermore, the SLEN displays excellent oxidative stability up to 4.7 V vs Li/Li. This simple three-component system enables the rational design of electrolytes from tunable discrete molecular architectures.

A Single‐Ion Conducting Borate Network Polymer as a Viable Quasi‐Solid Electrolyte for Lithium Metal Batteries

“…Mater. 2020, 32,1905771 www.advmat.de www.advancedsciencenews.com that of the non-crosslinked membrane (0.1 vs 0.01 MPa), confirming that crosslinking improves the membrane mechanical properties. Further, assuming ANP-5 is an isotropic material, the Young's modulus, E, can be approximated by the equation E = 2G(1 + v) [45] where G is the shear modulus and v is Poisson's ratio.…”

“…Mater. 2020, 32,1905771 calculated using the relationship proposed in ref. [59], with details described in Supporting Information.…”

“…Mater. 2020, 32,1905771 Figure 4c) compared with literature data for state-of-the-art solid electrolytes: a polystyrene-based anionic triblock copolymer, [6] a gel polymer made from lithium bis(allylmalonato)borate and pentaerythritol tetrakis (2-mercaptoacetate) in the presence of plasticizer, [11] poly(ethylene oxide) and lithium salts combined with a sulfated ZrO 2 ceramic filler, [54] and the polymerization product of lithium 1-[3-(methacryloyloxy)propylsulfonyl]-1-(trifluoromethylsulfonyl)imide with poly(ethylene glycol) methyl ether methacrylate and poly(ethylene glycol) methyl ether dimethacrylate in the presence of propylene carbonate as a plasticizer. [55] The battery prototype was able to deliver 79.9 mAh g −1 at 5.4C (67% of C/2 capacity), while the literature electrolytes were able to deliver 138.3 mAh g −1 at 2C (corresponding to 96% of C/2 capacity), [6] 86 mAh g −1 at 5C (corresponding to 59% of C/2 capacity), [11] 12.1 mAh g −1 at 2C (corresponding to 24% of C/2 capacity), [54] and 46.3 mAh g −1 at 5C (corresponding to 35% of C/2 capacity).…”

Bisalt ether electrolytes: a pathway towards lithium metal batteries with Ni-rich cathodes

“…Similar t Li 0.52 and 0.61 were reported from NMR measurements for triglyme(LiFSI) and triglyme(LiTFSI) equimolar mixtures respectively, 43 as well as a t Li of 0.54 for DME : LiTFSI (11 : 8) encapsulated in an organic framework. 44 Impedance spectroscopy yielded lower t Li compared to the NMR-based data indicating inclusion of ion correlation in analysis. 45 Analysis of the Li + solvate structure from MD simulations yielded that the Li + cation is preferentially coordinated by TFSI À over FSI À with each Li + being coordinated by 1.14 oxygens from TFSI À and only 0.93 oxygens from FSI À anions.…”

Supramolecular Tuning Enables Selective Oxygen Reduction Catalyzed by Cobalt Porphyrins for Direct Electrosynthesis of Hydrogen Peroxide

“…[15] Large, rigid POCs have the potential to incorporate multiple non-interacting active sites. This broad structural diversity in combination with soluble processing that is not possible with most heterogeneous materials has led to POC applications in gas separation, [16] artificial ion channels, [17] nanoparticle encapsulation, [18] batteries, [19] and supramolecular allostery. [20] The molecular structure of POCs also facilitates post-synthetic modifications where more robust and intricate cages can be obtained.…”