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Method for preparing high-density spherical lithium iron phosphate

A lithium iron phosphate, high-density technology, applied in the field of preparation of high-density spherical lithium iron phosphate, can solve the problems of unreachable, low bulk density lithium iron phosphate volume specific capacity, low bulk density, etc., to improve electrical conductivity, Great application value, simple process effect

Inactive Publication Date: 2007-02-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has obvious disadvantages. First, the doped impurity metal compound or carbon source cannot be fully and uniformly mixed with the lithium source, phosphorus source, and iron source, and the effect of sufficient doping cannot be achieved, and the conductivity of the material is not significantly improved.
The second is that the synthesized powder material is composed of irregular particles with low bulk density, and the general tap density is only 1.0g / cm 3 , than lithium cobaltate (general tap density 2.2-2.5g / cm 3 , as high as 2.8-2.9g / cm 3 ) is much lower, and the low bulk density makes the volume specific capacity of lithium iron phosphate much lower than that of lithium cobalt oxide, which has no advantage at all, hindering the practical application of this material

Method used

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Examples

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preparation example Construction

[0019] The designed preparation of spherical lithium iron phosphate or spherical lithium iron phosphate doped with metal ions or carbon-doped spherical lithium iron phosphate comprises the following steps:

[0020] 1) Weigh a certain amount of ferric nitrate, phosphoric acid, and lithium acetate with a molar ratio of 1:1:1, dissolve them in deionized water, and prepare ferric nitrate, phosphoric acid, and lithium acetate with concentrations of 1 to 3 mol / L in the three aqueous solutions Mixed aqueous solution A; or add a small amount of doping metal compound in the aforementioned mixed aqueous solution of ferric nitrate, phosphoric acid and lithium acetate to prepare ferric nitrate, phosphoric acid, lithium acetate, mixed aqueous solution A of doped metal compound; , phosphoric acid and lithium acetate mixed aqueous solution mixed with a small amount of doping carbon source to prepare ferric nitrate, phosphoric acid, lithium acetate, doped carbon source mixed aqueous solution A...

Embodiment 1

[0030] Measure about 20ml of deionized water, put it into a beaker, weigh 20.2g of iron nitrate (Fe(NO 3 ) 3 9H 2 O), 4.9g phosphoric acid (H 3 PO 4 ), 5.1g lithium acetate (CH 3 COOLi·2H 2 (2), be dissolved in deionized water to make ferric nitrate, phosphoric acid, lithium acetate concentration is the mixed aqueous solution A of 2.5mol / L. Then weigh 4.5 g of hexamethylenetetramine (urotropine) and 9 g of urea respectively, put them into another beaker, add about 20 ml of deionized water to dissolve to obtain solution B. Add solution B dropwise to solution A at a temperature of 10°C under stirring conditions to prepare a new mixed aqueous solution C. Using kerosene as a dispersant, add 3% span80 to kerosene as a surfactant by mass ratio, slowly add the newly prepared mixed aqueous solution C into the dispersant under stirring conditions, and the volume ratio of solution C to dispersant kerosene is 1 : 10. After the dropwise addition, the temperature was raised to 70° ...

Embodiment 2

[0032] Measure about 20ml of deionized water, put it into a beaker, weigh 8.08g of iron nitrate (Fe(NO 3 ) 3 9H 2 O), 1.96g phosphoric acid (H 3 PO 4 ), 2.04g lithium acetate (CH 3 COOLi·2H 2 O) be dissolved in deionized water to make iron nitrate, phosphoric acid, lithium acetate concentration is the mixed aqueous solution A of 1mol / L. Then weigh 4.5 g of hexamethylenetetramine (urotropine) and urea respectively, put them into another beaker, add about 20 ml of deionized water to dissolve to obtain solution B. Add solution B dropwise to solution A at a temperature of 5°C under stirring conditions to prepare a new mixed aqueous solution C. Using kerosene as a dispersant, add 1% span80 to the kerosene as a surfactant according to the mass ratio, slowly add the newly prepared mixed aqueous solution C into the dispersant under stirring conditions, and the volume ratio of solution C to dispersant kerosene is 1 : 15. After the dropwise addition, the temperature was raised t...

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Abstract

This invention discloses a high density ball ferric phosphate lithium process method in energy material process technique, which comprises the following steps: to use ferric nitrate, phosphate chrome and acetic acid lithium as materials and to add deionized water to process solution A; to mix impurity metal compound or carbon source into the solution A; to make solution of hexamethylenetetramine and carbamide to process solution B; to make solution C by adding solution B into solution A; to drop solution C with kerosene and to heat it into gel for deposition; to get the ball dry gel front driver after centrifugal separation; to get the high volume proportion capacity high density ferric phosphate lithium through high temperature process.

Description

technical field [0001] The invention belongs to the technical field of energy materials. In particular, it relates to a preparation method of a high-density spherical lithium iron phosphate used as a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, UPS, Camcorders, various portable electric tools, electronic instruments, weapons and equipment, etc. also have good application prospects in electric vehicles, and are considered to be high-tech products that are of great significance to the national economy and people's lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. Currently, the most studied cathod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48C01B25/26C01D15/00C01G1/02C01G49/00
CPCH01M4/5825Y02E60/10
Inventor 应皆荣姜长印万春荣高剑雷敏陈克勤
Owner TSINGHUA UNIV
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