发明名称 |
CRYSTALLINE NANOMETRIC LIFEPO4 |
摘要 |
The present invention relates to lithium secondary batteries and more specifically to positive electrode materials operating at potentials greater than 2.8 V vs. Li<SUP>+</SUP>/Li in nonaqueous electrochemical cells. In particular, the invention relates to crystalline nanometric carbon-free olivine-type LiFePO<SUB>4 </SUB>powders with enhanced electrochemical properties. A direct precipitation process is described for preparing crystalline LiFePO<SUB>4</SUB>powder, comprising the steps of: providing a water-based mixture having at a pH between 6 and 10, containing a water-miscible boiling point elevation additive, and Li<SUP>(I)</SUP>, Fe<SUP>(II) </SUP>and P<SUP>(V) </SUP>as precursor components; heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFePO4 powder An extremely fine 50 to 200 nm particle size is obtained, with a narrow distribution. The fine particle size accounts for excellent high-drain properties without applying any carbon coating. This allows for a significant increase in the active material content of the electrode. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery. |
申请公布号 |
EP1899268(B1) |
申请公布日期 |
2012.10.10 |
申请号 |
EP20060754362 |
申请日期 |
2006.06.15 |
申请人 |
UMICORE;CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE |
发明人 |
DELACOURT, CHARLES;POIZOT, PHILIPPE;MASQUELIER, CHRISTIAN |
分类号 |
C01B25/37;H01M4/13;H01M4/58;H01M10/052;H01M10/0565;H01M10/36 |
主分类号 |
C01B25/37 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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