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| Autor: | Yu-Hao Zeng, 曾昱豪 |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Transition metal oxides as anode materials in lithium ion batteries have attracted immense attention in recent years due to their high theoretical capacities as compared with commercial graphite. However, the huge volume change during the charge-discharge process leads to unstable electrochemical performances. In first part, we design a nanocomposite of Ni-doped Mn3O4@CMK-5 to solve the problem. Mn3O4 has high theoretical capacity (937 mAh/g), natural abundance and low toxicity. Ordered mesoporous carbon CMK-5 has nanoscale uniform mesopore, large surface area and good conducting network for both Li ions and electrons. Nickel doping could avoid the drastic volume change and aggregation of nanoparticles. Ni-doped Mn3O4@CMK-5 display a high reversible capacity up to 1263 mAh/g enen after 50 cycles at a current density of 100 mAh/g. The Ni-doped Mn3O4@CMK-5 nanocomposite is expected to be a promising anode material for lithium-ion batteries. In second part, we design a new hybrid organic-inorganic polymer electrolyte, base on 4,4'-Methylene diphenyl diisocyanate (MDI), Jeffamine ED2003, and silica sources like GLYMO and MPEOPS. The solid polymer electrolyte(SPE) was measured the ion conductivity value of 1.11 × 10-4 S cm-1 at 30 °C. A maximum ion conductivity value of 1.86 × 10-3 S cm-1 is achieved for the gel polymer electrolytes(GPE) immersed in liquid electrolyte solution. And as the gel electrolyte, the test cell shows good cycling performance. The new hybrid polymer system hold promise for application in lithium ion batteries. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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