The Origins of Ion Conductivity in MOF-Ionic Liquids Hybrid Solid Electrolytes

1materials

6samples

6synthesis routes

17measurements

58results

6claims and caveats

Evidence map

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Electrical Transport9 measurements45 results →Spectroscopy5 measurements10 results →Diffraction Structure2 measurements2 results →Porosity1 measurement1 result →

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Composite RoleSupport assessment: Medium

Adding LiTFSI to EMIM-TFSI does not decisively enhance conductivity; the LiTFSI-containing samples are within about a factor of two and MIL-121/Li + IL is slightly higher.

Caveat: Full conductivity isotherms for LiTFSI-containing samples are supplied in Supplementary Figure S1; quantitative comparison here relies mainly on Table 2 fit parameters and Figure 3C.

5 · 3 Results and Discussion · Table 2; Supplementary Figure S1 referenced · Linked to 3 structured results

Phase AssignmentSupport assessment: High

Li ion exchange does not destroy the MIL-121 crystal structure, as the activated pristine MIL-121 and MIL-121/Li XRD patterns retain matching MIL-121 reflections.

Caveat: Based on qualitative comparison of PXRD patterns in the SI; no refined lattice parameters are reported.

SI p002 · Supplementary Figures · Figure S3 · Linked to 1 structured result

Structure Property LinkSupport assessment: Medium

The ionic liquid likely does not enter the linear pores of MIL-121 to a significant extent and instead resides on particle surfaces or in interparticle voids.

Caveat: Conclusion is explicitly presented as requiring further work for definite confirmation.

7 · 4 Conclusion · Linked to 3 structured results

Transport MechanismSupport assessment: High

The high conductivity of the MOF-ionic-liquid hybrid samples is assigned mostly to the added ionic liquid, not to long-range transport of Li+ from ion-exchanged MIL-121.

Caveat: Authors state further investigations are necessary for definitive confirmation of pore exclusion.

6 · 3 Results and Discussion · Figures 3 and 4 · Linked to 4 structured results

Transport MechanismSupport assessment: High

Dry MIL-121/Li is a very poor ionic conductor because Li+ in the structure is too strongly bonded to the carboxylic group, giving negligible mobility.

Caveat: Based on impedance response and authors' mechanistic interpretation; microscopic proof of bonding strength is indirect.

5 · 3 Results and Discussion · Figure 2A · Linked to 2 structured results

Transport MechanismSupport assessment: Medium

Below 30 deg C, ionic-liquid-containing samples depart from simple Arrhenius behaviour, suggesting additional electrical relaxation mechanisms beyond elementary ion jumps.

Caveat: The authors suggest viscosity/VFT-like behaviour but note that this requires further clarification.

5 · 3 Results and Discussion · Figure 3C · Linked to 4 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

Material	Composition	Structure context	Source
MIL-121 metal-organic framework	not fully reported in main text; aluminium pyromellitate MIL-121 with free carboxylic groupsaluminium metal centres / infinite aluminium octahedra chains · 1,2,4,5-benzenetetracarboxylic acid, also known as pyromellitic acid	3D · PristineMIL-121 has linear pores lined by free carboxylic units; only two of four carboxylic groups participate in the MOF structure and the other two remain free for partial Li+ exchange.	3 · 3 Results and Discussion · Figure 1

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 6 sample records

Sample	Form and role	Processing and geometry	Source
MIL-121research_0669__mat__mat_mil121	Powder · Pristine Control · Pristine Framework	pure activated MOF before Li ion exchange or ionic-liquid addition	3 · 3 Results and Discussion · Figure 1
MIL-121 + ILresearch_0669__mat__mat_mil121	Pellet · Pristine Control · Guest Loaded	77 wt% Li-free MIL-121 with 23 wt% EMIM-TFSI ionic liquidpellets about 1 mm thick and 5 mm diameter for impedance spectroscopy	3 · Table 1 · Table 1
MIL-121 + IL + LiTFSIresearch_0669__mat__mat_mil121	Pellet · Pristine Control · Guest Loaded	77 wt% Li-free MIL-121 with 23 wt% 0.4 M LiTFSI in EMIM-TFSI solutionpellets about 1 mm thick and 5 mm diameter for impedance spectroscopy	3 · Table 1 · Table 1
MIL-121/Liresearch_0669__mat__mat_mil121	Pellet · Pristine Control · Doped	LiAc ion-exchanged MIL-121; activated at 300 deg C and 1e-3 mbar for 24 h before testingpellets about 1 mm thick and 5 mm diameter for impedance spectroscopy	3 · Table 1 · Table 1
MIL-121/Li + ILresearch_0669__mat__mat_mil121	Pellet · Target Sample · Guest Loaded	77 wt% MIL-121/Li with 23 wt% EMIM-TFSI ionic liquid; pressed pellet with sputtered Au blocking electrodes for impedance measurementspellets about 1 mm thick and 5 mm diameter for impedance spectroscopy	3 · Table 1 · Table 1
MIL-121/Li + IL + LiTFSIresearch_0669__mat__mat_mil121	Pellet · Target Sample · Guest Loaded	77 wt% MIL-121/Li with 23 wt% 0.4 M LiTFSI in EMIM-TFSI solutionpellets about 1 mm thick and 5 mm diameter for impedance spectroscopy	3 · Table 1 · Table 1