Synthesis of crystalline nanometric LiFeMPO 4

Details Synthesis of crystalline nanometric LiFeMPO 4 Synthesis of crystalline nanometric LiFeMPO 4

2007-11-19

2011-11-29

Kopec, Mark (Department: 1761)

Compositions

Electrically conductive or emissive compositions

Metal compound containing

C252S521200, C429S218100

Reexamination Certificate

active

08066916

ABSTRACT:
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 non-aqueous electrochemical cells. In particular, the invention relates to crystalline nanometric olivine-type LiFe1-xMxPO4powder with M is Co and/or Mn, and 0<x<1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of:—providing a water-based mixture having at a pH between 6 and 10, containing a dipolar aprotic additive, and Li(I), Fe(II), P(V), and Co(II)and/or Mn(II)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 LiFe1-xMxPO4powder. An extremely fine particle size is obtained of about 80 nm for Mn and 275 nm for Co, both with a narrow distribution. The fine particle size is believed to accounts for excellent high-drain properties, while minimizing the need for conductive additives. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

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