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Method for manufacturing industrialized high-energy lithium iron phosphate material

A lithium iron phosphate, high-energy technology, applied to electrical components, battery electrodes, circuits, etc., can solve problems such as complex process, poor material compaction performance, and difficulty in making high-capacity batteries

Active Publication Date: 2015-02-11
杭州金马新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method for preparing an industrialized high-energy lithium iron phosphate material, which mainly solves the problem that most of the existing lithium iron phosphate materials in the prior art are made in laboratories, and the process is complex and difficult to convert into industrialized products; and Some of them are processed after one-time ball milling, the particle size distribution is poor, the material compaction performance is poor, and it is difficult to make high-capacity batteries.

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  • Method for manufacturing industrialized high-energy lithium iron phosphate material
  • Method for manufacturing industrialized high-energy lithium iron phosphate material
  • Method for manufacturing industrialized high-energy lithium iron phosphate material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 (comparative example): Lithium salt, iron salt, and phosphorus salt were mixed according to the molar ratio of 1.01:1:1, and then 10% polyethylene glycol and 1% nickel nitrate were added, and the total mass of the solution was 400kg. In the ball mill for the first wet ball milling, the particle size is measured by MalvernMS2000 laser particle size analyzer to be 600nm-1200nm; a centrifugal spray granulation dryer is used, the inlet temperature is 240°C, and the outlet temperature is 100°C to obtain a spherical precursor; The precursor was put into a gas circulation furnace for sintering under the protection of nitrogen, and pre-fired at a constant temperature of 400°C for 5 hours; after the pre-fired precursor was ball milled and spray-dried, it was sintered under the protection of nitrogen at a constant temperature of 700°C for 5 hours.

[0031] Preparation of negative electrode material: with MCMB: acetylene black: polyvinylidene fluoride = 92wt%: 3wt%: 7wt% ...

Embodiment 2

[0036]Example 2 (comparative example): Lithium salt, iron salt, and phosphorus salt were mixed according to the molar ratio of 1.01:1:1, and then 10% polyethylene glycol and 1% nickel nitrate were added, and the total mass of the solution was 400kg. In the second wet ball milling in the ball mill, the particle size was measured by Malvern MS2000 laser particle size analyzer to be 50nm~500nm; a centrifugal spray granulation dryer was used, the inlet temperature was 240°C, and the outlet temperature was 100°C to obtain a spherical precursor; The precursor is put into a gas circulation furnace for sintering under the protection of nitrogen, and pre-fired at 400°C for 5 hours; after the pre-fired precursor is ball milled and spray-dried for the third time, it is sintered at 700°C for 5 hours under the protection of nitrogen. . The battery production is the same as in Example 1.

[0037] figure 1 To make the first charge and discharge curve of IFR 26650 battery at 0.2C.

Embodiment 3

[0038] Embodiment 3: A kind of preparation method of industrialized high-energy lithium iron phosphate material of this example is characterized in that described method comprises:

[0039] a. Add lithium salt, iron salt, phosphorus salt and mix in bead mill, wherein Li:Fe:P molar ratio is 1.01:1:1, add the polyethylene glycol of mass percentage 10% and the nickel nitrate of 1% again, the solution total The mass is 400kg, and the first wet ball milling is carried out, and the particle size is measured by a MalvernMS2000 laser particle size analyzer to be 600nm-1200nm. After the ball milling is completed, it is taken out for use;

[0040] b. Repeatedly add lithium salt, iron salt, and phosphorus salt of the same type and quality as step a into the bead mill and mix, then add polyethylene glycol and nickel nitrate of the same type and quality as step a, and the total mass of the solution is 400kg , carry out the second wet ball milling, measure its particle diameter by Malvern...

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Abstract

The invention relates to a method for manufacturing lithium iron phosphate materials, in particular to the method for manufacturing an industrialized high-energy lithium iron phosphate material. The method is mainly used for solving the technical problems that the existing lithium iron phosphate materials in the prior art are manufactured in a laboratory, are manufactured in a complicated process and are converted into industrialized products difficultly; and high power capacity batteries are manufactured difficultly if the materials with poor particle size distribution and bad material compaction capacity are adopted because the materials are processed only after a primary ball-milling is performed. The method provided by the invention comprises the following steps: adding and mixing lithium salt, ferric salt and phosphor salt twice and performing a wet ball milling twice to obtain two groups of slurry materials with different particle sizes; mixing, drying and presintering the two groups of the slurry materials in different proportions, carrying out the third wet ball milling and sintering on the slurry materials; and finally obtaining the high-energy lithium iron phosphate material.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate material, in particular to a preparation method of an industrialized high-energy lithium iron phosphate material. Background technique [0002] With the increasing scarcity of petrochemical resources and the rapid rise of crude oil prices again, the energy problem has obviously become a common problem plaguing the whole world. It is imminent to find new energy sources to replace crude oil as the power plant of automobiles. The emergence of lithium battery cathode materials has ushered in the spring for the industrialization of pure electric vehicles and hybrid vehicles. [0003] At present, Li-ion cathode materials mainly include LiCoO 2 , LiMn 2 o 4 、LiNi x co y mn Z o 2 、LiFePO 4 . where LiCoO 2 It is currently the only cathode material that has been industrialized and commercialized on a large scale. More than 90% of lithium-ion batteries on the market use this mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 李旺王张志顾建锋王吉石小英王汉杰
Owner 杭州金马新能源科技有限公司
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