He S., Li Z., Wang J. · Journal of Solid State Chemistry · 2022 · 122726
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
Longer cycling at high current still shows capacity decay, associated with increased charge-transfer/diffusion resistance and microsphere breakage.
Caveat: High-current end capacities are visual estimates from Fig. 4f; the qualitative stability caveat is directly stated in the text.
5 · 3. Results and discussion · Fig. 5 · Linked to 4 structured results
Changing the Co/Ni molar ratio does not significantly alter the framework crystal structure; the samples are assigned as isostructural to a reported Co-based MOF with C2/m symmetry.
Caveat: No CIF or refined structure for the mixed-metal samples was supplied in the prompt; assignment relies on PXRD/spectroscopy comparison in the main text.
2 · 3. Results and discussion · Fig. 1 · Linked to 3 structured results
The Co/Ni precursor ratio tunes morphology from irregular fragments to loose nanospheres and then stacked nanosheets; the nominal 1:1 loose-packed nanosphere sample gives the best overall LIB performance.
Caveat: The authors state the mechanistic effect of precursor composition on morphology is still unclear.
3 · 3. Results and discussion · Fig. 3 · Linked to 3 structured results
The enhanced electrochemical performance is attributed partly to improved electronic/ionic conductivity and lower electrode resistance in the bimetallic Co-Ni-MOF electrodes, especially the 1:1 sample.
Caveat: Conductivity is inferred from composite-electrode EIS; no direct pristine-framework conductivity value is reported.
5 · 3. Results and discussion · Fig. 4b · Linked to 5 structured results
High reversible capacity is attributed to stepwise Co and Ni reduction plus successive lithiation/reaction of BDC ligand carbons.
Caveat: Mechanism is proposed from electrochemical profiles and analogy to prior studies rather than directly resolved operando chemistry.
5 · 3. Results and discussion · Scheme 1 · Linked to 4 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Co-Ni-MOF mixed-metal terephthalate framework family | Co/Ni-BDC MOF; exact formula not reportedCo(II) and Ni(II) ions, with Co/Ni varied by precursor ratio · 1,4-benzenedicarboxylate (BDC2-) from H2BDC | unknown · PristineIsostructural bimetallic MOFs with the same diffraction peak positions as a reported Co-based MOF in space group C2/m. | 2 · 3. Results and discussion · Fig. 1a |
| MOF/carbon black/PVDF lithium-ion battery electrode composite | MOF + carbon black + PVDF, 7:2:1 by massCo/Ni or Ni nodes in the MOF active component · BDC2- in the MOF active component | unknown · CompositeComposite working electrode made by casting MOF, carbon black and PVDF paste on Cu foil. | 2 · 2.3. Electrochemical measurements |
| Ni-MOF control | Ni-BDC MOF; exact formula not reportedNi(II) ions · 1,4-benzenedicarboxylate (BDC2-) from H2BDC | unknown · PristineMonometallic Ni-MOF obtained under the same solvothermal conditions with Co/Ni precursor ratio 0:1. | 4 · 3. Results and discussion · Fig. 3g,h |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| Co-Ni-MOF nominal Co/Ni 1:1 powderresearch_0313__mat__mat_coni_mof | Powder · Target Sample · Mixed Metal | As-synthesised, washed and freeze-dried powder; actual Co/Ni about 1:0.90 by ICP-OES. | 2 · 2.1. Preparation of Co-Ni-MOF |
| Co-Ni-MOF nominal Co/Ni 1:2 powderresearch_0313__mat__mat_coni_mof | Powder · Target Sample · Mixed Metal | As-synthesised, washed and freeze-dried powder; actual Co/Ni about 1:1.64 by ICP-OES. | 2 · 2.1. Preparation of Co-Ni-MOF |
| Co-Ni-MOF nominal Co/Ni 2:1 powderresearch_0313__mat__mat_coni_mof | Powder · Target Sample · Mixed Metal | As-synthesised, washed and freeze-dried powder; actual Co/Ni about 1:0.48 by ICP-OES. | 2 · 2.1. Preparation of Co-Ni-MOF |
| Co-Ni-MOF 1:1/carbon black/PVDF electroderesearch_0313__mat__mat_mof_cb_pvdf_electrode | Electrode · Composite Sample · Composite | Nominal Co/Ni 1:1 MOF electrode composite in CR2032 coin cells.Cu foil | 1 · Abstract |
| Co-Ni-MOF 1:2/carbon black/PVDF electroderesearch_0313__mat__mat_mof_cb_pvdf_electrode | Electrode · Composite Sample · Composite | Nominal Co/Ni 1:2 MOF electrode composite in CR2032 coin cells.Cu foil | 4 · 3. Results and discussion · Fig. 4a |
| Co-Ni-MOF 2:1/carbon black/PVDF electroderesearch_0313__mat__mat_mof_cb_pvdf_electrode | Electrode · Composite Sample · Composite | Nominal Co/Ni 2:1 MOF electrode composite in CR2032 coin cells.Cu foil | 4 · 3. Results and discussion · Fig. 4a |
| MOF/carbon black/PVDF electrode seriesresearch_0313__mat__mat_mof_cb_pvdf_electrode | Electrode · Composite Sample · Composite | MOF, carbon black and PVDF in NMP cast on Cu foil and dried at 90 deg C for 12 h in vacuum.Cu foil | 2 · 2.3. Electrochemical measurements |
| Ni-MOF/carbon black/PVDF electroderesearch_0313__mat__mat_mof_cb_pvdf_electrode | Electrode · Pristine Control · Composite | Nominal Co/Ni 0:1 Ni-MOF electrode composite in CR2032 coin cells.Cu foil | 5 · 3. Results and discussion · Fig. 4a |
| Ni-MOF nominal Co/Ni 0:1 powderresearch_0313__mat__mat_ni_mof | Powder · Pristine Control · Pristine Framework | As-synthesised, washed and freeze-dried powder from Ni(NO3)2.6H2O without Co precursor. | 4 · 3. Results and discussion · Fig. 3g,h |
| Co-Ni-MOF/Ni-MOF powder seriesresearch_0313__mat__mat_coni_mof | Powder · Paper Level Unspecified · Unknown | Solvothermal powder series with nominal Co/Ni ratios 2:1, 1:1, 1:2 and 0:1. | 2 · 2.1. Preparation of Co-Ni-MOF |