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    • 4. 发明申请
    • CRYSTALLINE NANOMETRIC LIFEPO4
    • 水晶纳米生物素4
    • WO2007000251A1
    • 2007-01-04
    • PCT/EP2006/005725
    • 2006-06-15
    • UMICORECENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEDELACOURT, CharlesPOIZOT, PhilippeMASQUELIER, Christian
    • DELACOURT, CharlesPOIZOT, PhilippeMASQUELIER, Christian
    • C01B25/37H01M4/58
    • H01M4/5825C01B25/37H01M10/052H01M10/0565Y10T428/2982
    • 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 + /Li in nonaqueous electrochemical cells. In particular, the invention relates to crystalline nanometric carbon- free olivine-type LiFePO 4 powders with enhanced electrochemical properties. A direct precipitation process is described for preparing crystalline LiFePO 4 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 (I) , Fe (II) and P (V) 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.
    • 本发明涉及锂二次电池,更具体地说涉及在非水电化学电池中工作电压大于2.8V的正极材料相对于Li + / Li。 特别地,本发明涉及具有增强的电化学性质的结晶纳米碳无橄榄石型LiFePO 4 N 4 O 3粉末。 描述了用于制备结晶LiFePO 4 N 2粉末的直接沉淀方法,其包括以下步骤: - 提供pH6至10的含水混合沸点升高添加剂的水基混合物 和作为前体成分的Li(O),Fe(II)和P(V) - 将所述水性混合物加热至大气压下的沸点,从而沉淀出结晶的LiFePO 4粉末。 得到极细的50〜200nm粒径,分布窄。 在不施加任何碳涂层的情况下,细颗粒尺寸表现出优异的高排水性能。 这允许电极的活性物质含量显着增加。 窄的分布有助于电极制造过程,并确保电池内的均匀电流分布。