Preparation method of multicrystal LiFePO4 powder having olivine structure

A technology of olivine structure and H2PO4, which is applied in the direction of structural parts, chemical instruments and methods, rare earth metal compounds, etc., can solve the problems that are not conducive to the electrochemical performance of materials, the purity of synthetic materials is not high, and the particle size is large, so as to improve electronic performance. The effect of electrical conductivity, fine particles, and low firing temperature
CN1410349AInactive Publication Date: 2003-04-16TSINGHUA UNIV
2 Cites 59 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2003-04-16
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A polycrystalline LiFePO4 powder with olivine structure is prepared from Fe(Ac)2, FeSO4.7H2O, Ba(Ac)2 and organic acid by the sol-gel method. Its advantages are short period, low burning temp., low energy consumption, high purity and electric conductivity, and high granularity uniformity. It is suitable for making Li-ion battery.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of material preparation, in particular to an olivine-structured polycrystalline LiFePO 4 Powder preparation method. Background technique

[0002] LiFePO 4 The material has the characteristics of cheap, non-toxic, non-hygroscopic, good environmental compatibility, rich mineral resources, high capacity (theoretical capacity is 170mAh / g, energy density is 550Wh / Kg), and good stability. It is one of the most potential alternative materials for lithium battery cathode materials. It has broad application prospects and great market demand. There are several synthetic methods:

[0003] Solid-phase synthesis method: JP2000294238 mixes ferrous oxalate, lithium carbonate and diammonium hydrogen phosphate as initial materials and then calcines at high temperature for a long time. EP1193786 uses lithium phosphate and ferrous phosphate as initial materials for mixed calcining. The solid-phase synthesis material has ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More