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Iron lithium phosphate material used for lithium ion battery and its manufacturing method

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of difficult electrode processing, low tap density, etc., to achieve convenient electrode smear processing and improve vibration Density, the effect of improving electrical properties

Inactive Publication Date: 2006-03-29
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] US Patent Application No. US 2003 / 0077514 A1 discloses a method for manufacturing lithium iron phosphate. The method uses ferric salt as raw material, doping metal ions on the iron site, and mixing carbon materials in the raw material, which has excellent high-rate charging. Discharge characteristics, but because more carbon black is added to the material, the tap density is low, which brings difficulties to the processing of the electrode to be produced

Method used

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Embodiment 1

[0029] Embodiment 1: A kind of manufacture method of lithium iron phosphate material for lithium ion battery, lithium source, iron source, phosphate source and dopant magnesium oxide are all calculated according to 100% purity, take 0.98mol molecular formula as CH 3 COOLi.2H 2 O lithium acetate 99.902 grams, the molecular formula is MgO 0.02mol magnesium oxide 0.806 grams, the molecular formula is Fe 2 (C 2 o 4 ) 3 .5H 2 O 0.5mol iron oxalate 232.92 grams, the molecular formula is (NH 4 ) 2 HPO 4 132.06 grams of 1.0mol diammonium hydrogen phosphate; 7.5 grams of carbon black, 150nm in diameter, 6.332 grams of carbon fibers with a length of 10-20 μm, respectively put into 600ml deionized ethanol water accounting for 10% of the total volume of the aqueous solution, and add 10% Adjust the pH of the solution to 5 with the weight ratio of acetic acid solution, fully stir at 40°C until the lithium source, iron source, phosphate source and magnesium source compound are dissolv...

Embodiment 2

[0030] Embodiment 2: A kind of manufacturing method of lithium iron phosphate material for lithium-ion batteries, weighing 0.98mol molecular formula is CH 3 COOLi.2H 2 O lithium acetate 99.902 grams, the molecular formula is MgO 0.02mol magnesium oxide 0.806 grams, the molecular formula is Fe 2 (C 2 o 4 ) 3 .5H 2 O 0.5mol iron oxalate 232.92 grams, the molecular formula is (NH 4 ) 2 HPO 4 132.06 grams of 1.0mol diammonium hydrogen phosphate, 7.5 grams of carbon black, a diameter of 150nm, and a length of 6.332 grams of carbon fibers of 10-20 μm, 15 grams of oxalic acid and 4800 grams of agate balls are put into an agate jar together. Ball mill and mix at 150rpm for 4 hours, put the mixture into a corundum boat, raise the temperature to 450°C at 2°C / min under the protection of high-purity argon, and keep it at this temperature for 6 hours, then raise the temperature to 750°C at the same speed , and kept at this temperature for 8 hours, and finally cooled to room tempera...

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Abstract

The invention relates to a LiFePO4 material for Li-ion battery and the making method thereof. The method controls diameter and length of C or metallic fiber at 100-300 nm and 10-20 mum, respectively and dopes ions with valences greater than +2-+4 in Li situ of LiFePO4, in the raw material composed of Li source, ion-doped compound, trivalent Fe source, phosphate radical, charcoal material, and C / metallic fiber, so as to make the LiFePO4 material, largely reducing the charcoal material content of the made LiFePO4 material on the premise of not reducing electron conductivity; and because the specific surface area of the charcoal material is selected at 30-80 sq m / g, effectively raising the tap density of material so as to bring a great convenience to the follow-up electrode smearing process. And the prepared LiFePO4 material has low cost and simple operating process, easy to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a lithium iron phosphate material for lithium ion batteries and a manufacturing method thereof. Background technique [0002] At present, lithium-ion batteries have been widely welcomed by people because of their high specific energy, high specific power and good high-temperature performance. Lithium cobalt oxide is used in more than 90% of commercial lithium-ion battery cathode materials, but its high price and safety issues limit its application in large-capacity and high-power lithium-ion batteries. In recent years, a new lithium-ion battery cathode material-lithium iron phosphate has been widely developed because it can overcome the above-mentioned shortcomings. [0003] US Patent Application No. US 2003 / 0077514 A1 discloses a method for manufacturing lithium iron phosphate. The method uses ferric salt as raw materia...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04C01G1/02C01G49/00C01D15/00C01B25/00H01M4/62
CPCY02E60/12Y02E60/10
Inventor 龚金保韩宇高洪森付亚娟高英黄玉兰
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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