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Melt Casting LiFePO4
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DOI：10.1149/1.3284505.png)
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摘要
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A melt casting process to make an electrochemically active LiFePO4 cathode material was explored. The melting of carbon-coated LiFePO4 powder at 1000 degrees C followed by its cooling leads to a high purity LiFePO4 material with excellent crystallinity and large crystals. From a detailed study on the melting of naturally occurring triphylite, elements such as Mg and Mn were easily incorporated into the olivine structure, while others such as Ca, Si, and Al were segregated into grain boundaries. Experiments also demonstrated that a variety of synthetic precursors can be used to make high purity LiFePO4 materials through melt casting. The phase purity, crystallinity, and microstructures of the final product depend on the reducing conditions and the solidification process of the melt. The melt-casted material, after coarse grinding, shows good electrochemical activity.
Keyword:
aluminium
calcium
casting
electrochemical electrodes
grain boundary segregation
iron compounds
lithium compounds
magnesium
manganese
melting
powder technology
silicon
solidification
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期刊
IF:
3.3
论文数:
3.3W
被引数:
9.4W
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