The lithium iron phosphate of olivine crystal structure and the lithium secondary battery for using the lithium iron phosphate

The lithium iron phosphate of olivine crystal structure and the lithium secondary battery for using the lithium iron phosphate

  • CN 102,844,916 B
  • Filed: 04/21/2011
  • Issued: 12/04/2018
  • Est. Priority Date: 04/21/2010
  • Status: Active Grant
First Claim
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1. sulphur is for the purposes by carbon coating on the lithium iron phosphate with olivine crystal structure, wherein in the lithium iron phosphorusCarbon (C) is coated on the particle surface of hydrochlorate,Wherein, it is dispersed in water when by the powder for having coated the lithium iron phosphate of carbon, water is removed from resulting dispersion liquidWhen going, and carrying out quantitative analysis to resulting lithium iron phosphate residue, the lithium iron phosphate of carbon is released relative to having coated carbonThe lithium iron phosphate total weight ratio be 0.005 weight % hereinafter,Compound containing at least sulphur ingredient is used as the precursor of iron,Total weight wherein based on the lithium iron phosphate for having coated carbon, the lithium iron phosphate for having coated carbon contain 0.5The sulphur (S) of the weight of weight %~2 %,Wherein the lithium iron phosphate has and is made of what following formula 1 indicated:

  • Li1+aFe1-xMx(PO4-b)Xb (1)WhereinM is to be selected from least one of Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y element,X be selected from least one of F, S and N element, and- 0.5≤

    a≤

    + 0.5,0≤

    x≤

    0.5,0≤

    b≤

    0.1,Wherein the sulphur and the carbon exist in the form of selected from such as flowering structure;

    (i) wherein to be incited somebody to action in the state of the sulphur on the surface of the lithium iron phosphate particle and/or inside it containing predetermined amountStructure of the carbon coating on the surface of the lithium iron phosphate particle;

    (ii) structure being wherein both coated on sulphur and carbon on the surface of the lithium iron phosphate particle;

    (iii) structure being wherein coated on the composite material of sulphur and carbon on the surface of the lithium iron phosphate particle;

    (iv) wherein carbon is integrated to the structure on the lithium iron phosphate particle by sulphur;

    AndTheir combination.

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