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    • 8. 发明申请
    • LITHIUM IRON PHOSPHATE HAVING AN OLIVINE STRUCTURE, AND PREPARATION METHOD THEREOF
    • 具有OLIVINE结构的锂铁磷酸盐及其制备方法
    • WO2010047524A3
    • 2010-07-29
    • PCT/KR2009006084
    • 2009-10-21
    • LG CHEMICAL LTDCHOY SANGHOONLEE YONG TAEPARK HONG-KYUPARK SOO MINLEE JI EUN
    • CHOY SANGHOONLEE YONG TAEPARK HONG-KYUPARK SOO MINLEE JI EUN
    • C01B25/30
    • C01B25/45H01M4/043H01M4/131H01M4/5825H01M2004/021
    • The present invention relates to a lithium iron phosphate having an olivine crystal structure, and more particularly, to an olivine lithium iron phosphate which consists of secondary particles having a mean diameter (D50) of 5~100 µm where primary particles having a mean diameter (D50) of 50~550 nm are agglomerated, the primary particles and the secondary particles have compositions of chemical formula (1) Li1+a Fe1-x Mx(PO4-b) Xb (where M, X, a, x, and b are as defined in the specification), and the secondary particles have a porosity of 15~40%. The lithium iron phosphate according to the present invention has the form of secondary particles, and thus can be produced into an electrode for a lithium secondary battery having a high volume density. The lithium iron phosphate of the present invention shortens mixing time to improve process efficiency. Further, the lithium iron phosphate of the present invention has a high porosity, and therefore at least a part of secondary particles collapses and is particulated into primary particles during the compression process for manufacturing an electrode, thus preventing the degradation of ionic conductivity caused by large particle size.
    • 本发明涉及具有橄榄石晶体结构的磷酸铁锂,更具体地说,涉及一种平均直径(D50)为5〜100μm的二次粒子的橄榄石磷酸铁锂,其中一次粒子的平均直径( D50)为50〜550nm附聚,初级粒子和二次粒子具有化学式(1)Li1 + a Fe1-xMx(PO4-b)Xb(其中M,X,a,x和b 如本说明书中所定义),二次颗粒的孔隙率为15〜40%。 根据本发明的磷酸铁锂具有二次粒子的形式,因此可以制成具有高体积密度的锂二次电池用电极。 本发明的磷酸铁锂缩短混合时间以提高加工效率。 此外,本发明的磷酸铁锂具有高孔隙率,因此在制造电极的压缩过程中至少一部分二次粒子塌陷并被微粒化成一次粒子,从而防止由于大的电极引起的离子导电性的降低 粒度。