Status : Verified
| Personal Name | Palaganas, Mecaelah Salcedo |
|---|---|
| Resource Title | Silver-Doped Prussian White (Na2+xMn1-xAgx[Fe(CN)6]·nH2O, x = 0 – 0.15) as Novel Cathode Materials for Sodium-ion Batteries |
| Date Issued | 31 January 2025 |
| Abstract | Prussian blue (PB) and its analogues (PBA) are promising materials for sodium-ion batteries (SIBs) due to its sturdy and open framework which accommodates volume change and allow fast diffusion of Na+ during battery cycling. Particularly, fully-sodiated Mn-based Prussian White (PW, Na2Mn[Fe(CN)6]) can have high Na+ concentration in the framework allowing the employment of simpler and cheaper non-sodium-based anode, hence, better scalability and commerciality. However, the Jahn-Teller effect of Mn3+ causes structural deformation in PW, resulting in significant volume changes and deteriorating cycle performance. While period 4 transition metal atoms (e.g., Ni, Cu, Zn) have been extensively explored as dopants to improve the cycling stability of PWs, the effect of other metal dopants such as silver (Ag) remains largely unexplored. Herein, various amounts of Ag were introduced to manganese hexacyanoferrate framework (Na2+xAgxMn1-x[Fe(CN)₆]·nH2O; x = 0 – 0.15) through a facile coprecipitation method. The material properties of the compounds were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, Scanning Electron microscopy and Transmission Electron Microscopy with Energy-Dispersive X-ray spectroscopy (SEM-EDS, TEM-EDS), Thermogravimetric Analysis (TGA), C,H,N elemental analysis, and Brunauer-Emmett-Teller (BET) surface area measurements. Electrochemical performance evaluations in half-cell configurations show that doping Mn with 10 mol% Ag resulted in the best overall electrochemical performance among the synthesized PW materials. This concentration delivered a superior rate performance obtaining 70.76 mAh g-1 at 5C, equivalent to 49.85% of its initial capacity (141.94 mAh g-1) at 0.1C (1C = 170 mAh g-1) which is superior to the undoped PW (37% capacity obtained at 5C). It also exhibited an excellent long-term cycling performance with 54.73% capacity retention after 100 cycles at 1C (vs. 46.41% in the un |
| Degree Course | Master of Science in Chemical Engineering |
| Language | English |
| Keyword | Energy storage, Batteries, Cathode, Prussian White, Silver doping |
| Material Type | Thesis/Dissertation |
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Category : I - Has patentable or registrable invention of creation.
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