The use of mineral/polyimide composites for lithium-ion battery separators provides an outstanding development direction. Minerals that can be used for lithium-ion battery separators are minerals that have good pores size and distribution, can be intercalated with lithium-ions, and are hydrophobic. Montmorillonite is a natural mineral belonging to the smectite group, and has the capacity to exchange cations but is hydrophilic so it is necessary to modify it to make it hydrophobic and to keep it rich in lithium ions for such purpose. In this study, organic modification has been carried out to change the hydrophilic nature of montmorillonite to become hydrophobic under lithium-ion-rich conditions. Montmorillonite was first isolated by sonicating the dispersion, then carefully separating its suspension after several days of aging. Afterward, the suspension was precipitated by centrifugation and finally dried at 80°C. Thereafter, carbonate cations, organic compounds, and metal oxides, especially ferrous oxide, are removed. The purified isolated montmorillonite is then lithiated with lithium chloride. Finally, the surface of the pre-lithiated montmorillonite was modified with cetyltrimethylammonium bromide to obtain organic-modified pre-lithiated montmorillonite. The results of characterization with an infrared spectrophotometer showed vibration peaks at 2928 cm-1, 2854 cm-1, and 1476 cm-1 as evidence of the presence of attached cetyltrimethylammonium, and vibration peaks at 520 cm-1 and 463 cm-1 as evidence of the presence of attached lithium. The results were also characterized by SEM and XRD which shows that the montmorillonite was organically modified, and lithium intercalated.
The main limitation of LiFePO4 (LFP) as a cathode material for lithium-ion battery (LIB) is its poor rate performance due to its low electronic conductivity values. At present, there are three main efforts being intensively carried out to overcome this: cation doping, crystal morphology adjustment, and LFP surface modification. Surface modification of LFPs has become a major concern in efforts to improve battery performance. The use of zeolitic imidazolate frameworks 8 (ZIF-8) and 67 (ZIF 67) as N-doped C sources for surface modification of LIB cathodes carried out in several studies has shown an improvement in the electrochemical performance of LIB. However, the thermal, solvothermal and chemical stability of ZIF-8 and ZIF-67, which adopt the sodalite (SOD) topology, is still not enough for this purpose. Zeolitic imidazolate frameworks 14 (ZIF-14), which is homologous to ZIF-8 and ZIF-67 with its crystals adopting analcime (ANA) topology, has better thermal, solvothermal, and chemical stability than ZIF-8 and ZIF-67. Apart from its topology, ZIF-14 cobalt (ZIF-14 Co) can be synthesized rapidly in a water-based system at room temperature, so that its use becomes more effective and efficient. This paper will describe the synthesis and characterization procedure of ZIF-14 Co for use as a modification material for the cathode surface of LIB.
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