期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 30, 页码 14932-14937出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm31933k
关键词
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资金
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Knowledge Economy [20104010100560]
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2009-0092780]
A LiCoPO4 positive electrode material with an extremely high discharge capacity, 145 mA h (g-phosphate)(-1), is reported. Seeking high capacity, we examined three kinds of precursors, Co3O4, Co-3(PO4)(2)center dot 2H(2)O, and NH4CoPO4 center dot H2O. In combination with a thermal gravimetric study, we found that simple the dehydration of the first two precursors is related to the formation of LiCoPO4-acetylene black carbon composites (hereafter referred as C-LiCoPO4). Meanwhile, the formation of the C-LiCoPO4 composite is somewhat different. That is, generation of NH3 gas and dehydration of the NH4CoPO4 center dot H2O precursor occurs spontaneously, and the NH3, which decomposes to N-2 and H-2 gases, provides a more reductive environment during calcination, leaving a small quantity of metallic Co nanoparticles (<10 nm). Distribution of the added acetylene black carbon network is important for proper electron transfer, resulting in good rate capability and capacity retention at 25 degrees C and 55 degrees C, which has never been reported.
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