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Multicomponent doping spherical lithium iron phosphate anode material and method of manufacturing the same

A lithium iron phosphate and cathode material technology, applied in chemical instruments and methods, phosphorus compounds, electrical components, etc., can solve the problems of unifying conductivity and packing density of difficult materials, poor comprehensiveness, etc., and reduce reaction activation. Energy, simple process, low cost effect

Active Publication Date: 2009-02-18
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The doped lithium iron phosphate in the prior art is difficult to unify the electrical conductivity and packing density of the material, and the comprehensiveness is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Put 41g lithium fluoride, 58g lithium carbonate, 118g ferrous fluoride, 255g ferrous oxalate, 370g ammonium dihydrogen phosphate, 3.9g magnesium fluoride, 11g titanium fluoride, 100g sucrose and 780g deionized water in a ball mill Medium mixing for 5 hours;

[0023] 2) drying and ball milling for 3 hours;

[0024] 3) After heating up to 350°C at a rate of 2°C / min in a nitrogen protection furnace, keep the temperature constant for 6 hours;

[0025] 4) cooling to room temperature, ball milling in ball mill for 8 hours;

[0026] 5) At 1500KN / cm 2 Tablets under pressure;

[0027] 6) In the nitrogen protection furnace, the temperature was raised to 760°C at a rate of 3°C / min, and the temperature was kept constant for 12 hours;

[0028] 7) Cool naturally, and ball mill for 3 hours to obtain the multi-component doped spherical lithium iron phosphate positive electrode material of the present invention, and the product is spherical. The average particle size of the prod...

Embodiment 2

[0031] 1) 83g of lithium fluoride, 544g of ferrous oxalate, 370g of ammonium dihydrogen phosphate, 4g of magnesium fluoride, 14.86g of titanium fluoride, 200g of sucrose and 607.93g of deionized water were placed in a ball mill and mixed for 5 hours;

[0032] 2) drying and ball milling for 3 hours;

[0033] 3) After heating up to 350°C at a rate of 2°C / min in a nitrogen protection furnace, keep the temperature constant for 6 hours;

[0034] 4) cooling to room temperature, ball milling in ball mill for 8 hours;

[0035] 5) At 1500KN / cm 2 Tablets under pressure;

[0036] 6) In the nitrogen protection furnace, the temperature was raised to 760°C at a rate of 3°C / min, and the temperature was kept constant for 12 hours;

[0037] 7) Cool naturally, and ball mill for 3 hours to obtain the multi-component doped spherical lithium iron phosphate cathode material of the present invention, which is a spherical powder. The measured average particle size of the product is 2-8μm, and the...

Embodiment 3

[0040] 1) Put 41g lithium fluoride, 59g lithium carbonate, 118g ferrous fluoride, 255g ferrous oxalate, 370g ammonium dihydrogen phosphate, 3.9g magnesium fluoride, 11g titanium fluoride, 100g sucrose and 780g deionized water in a ball mill Medium mixing for 5 hours;

[0041] 2) drying and ball milling for 3 hours;

[0042] 3) After heating up to 350°C at a rate of 2°C / min in a nitrogen protection furnace, keep the temperature constant for 6 hours;

[0043] 4) cooling to room temperature, ball milling in ball mill for 8 hours;

[0044] 5) At 1500KN / cm 2 Tablets under pressure;

[0045] 6) In the nitrogen protection furnace, the temperature was raised to 900°C at a rate of 3°C / min, and the temperature was kept constant for 12 hours;

[0046] 7) Cool naturally, and ball mill for 3 hours to obtain the multi-component doped spherical lithium iron phosphate positive electrode material of the present invention, and the product is spherical. The average particle size of the prod...

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Abstract

The invention provides a multi-doping spherical ferric phosphate lithium anode material and manufacture method thereof, the chemical formula of the anode material is Li1.03-xMgx / 2Fe1-yTiy / 2PO4-z / 2Fz / C, wherein 0<x<=0.1; 0<y<=0.1; 0 <z<=0.1. The anode material according to the invention comprises high unit capacity (>160mAh / g) and compaction proportion (1.45 to 1.75g / cm3), which efficiently enhance conduction ability thereof with excellent unit capacity. The raw material of the anode material according to the invention uses villaumite to reduce reaction activation energy, increase liquidoid during reaction process in order to control product particle feature to obtain spherical particle and enhance compaction proportion, being beneficial to improve manufacture process of electrode paste, simplify preparation and coating of battery paste and process the plate electrode; by being doped with magnesium, titanium and fluorine in the material structure to form semiconductors, the conduction ability of the material can be improved. The invention has simply process, low costs, being convenient to realize industrial manufacture.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] In the research field of lithium ion secondary battery cathode materials, lithium iron phosphate LiFePO 4 has received widespread attention. The theoretical capacity of lithium iron phosphate is as high as 170mAh / g, the reversible capacity is high, the structure is stable before and after charging and discharging, and it has a stable voltage platform. [0003] In the structure of lithium iron phosphate, a FeO 6 Octahedron with two LiO 6 Octahedron and a PO 4 Coedge Tetrahedron, PO 4 tetrahedron with a FeO 6 octahedron and two LiO 6 Octahedral shared edges, this structural feature makes Li + The intercalation and extraction movements of the lithium iron phosphate material are affected, resulting in low conductivity and ion diffusion rate of the lithium iron pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48C01B25/45B01J19/00
CPCY02E60/10
Inventor 李启彭忠勇万里城孙鸿飞刘玉萍欧阳曦
Owner SHENZHEN BAK POWER BATTERY CO LTD
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