Study of LiFePO4 for Cathode Application
碩士 === 國立暨南國際大學 === 應用化學系 === 92 === Lithium iron phosphate (LiFePO4) as cathode material of secondary lithium battery has attracted wide attention in last few years. The major obstacles of LiFePO4 application are the low intrinsic conductivity and protecting environment required to stabilize the +2...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61750723096906618692 |
| Summary: | 碩士 === 國立暨南國際大學 === 應用化學系 === 92 === Lithium iron phosphate (LiFePO4) as cathode material of secondary lithium battery has attracted wide attention in last few years. The major obstacles of LiFePO4 application are the low intrinsic conductivity and protecting environment required to stabilize the +2 valence state. Solid state sintering, carbon-mixed sintering, solution co-precipitation and chemical substitution methods were utilized to synthesize LiFePO4 and LiMnyFe1-yPO4. Properties of electrical conductivity, particle size and the y value of LiMnyFe1-yPO4 correlated with the charged/discharged performance were studied. Samples prepared by different methods will affect the purity and particle size of LiFePO4 while the carbon-mixed sintering displays a most significant improvement of electrical conductivity. The nonconclusive charged/discharged data of the manganese-substituted compounds may result from the complicated valence state of manganese. Details characterization associated with band structure study turn out to be crucial in finding an effective way to enhance the valence stability and electrical conductivity of LiMnyFe1-yPO4.
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