A kind of positive electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery and cathode material technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as ammonia nitrogen pollution, and achieve the effects of controllable process, uniform distribution of effective metals, and low product cost

Active Publication Date: 2018-03-09
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One object of the present invention is to propose a modified battery positive electrode material precursor for the ammonia nitrogen pollution problem in the preparation process of the existing lithium-ion battery positive electrode material lithium iron manganese phosphate and its precursor, thereby effectively reducing the concentration of iron manganese lithium phosphate. The pressure on the environment during the preparation process provides a pollution-free and sustainable alternative green process route for subsequent large-scale production

Method used

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  • A kind of positive electrode material of lithium ion battery and preparation method thereof
  • A kind of positive electrode material of lithium ion battery and preparation method thereof
  • A kind of positive electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] According to the chemical formula Fe 0.1 mn 0.9 HPO 4 ·3H 2 O Weigh 0.1mol metallic iron and 0.9mol metallic manganese and dissolve them in a mixed solution of 200g deionized water and 1mol phosphoric acid, and keep stirring and mixing for 1 hour; the resulting solution is warmed up to 50 degrees for 10 hours, and then slowly added to the system Add 100 g of ethanol, and at this time, a precipitate occurs in the system; the obtained precipitate is washed 3 times with deionized water and ethanol, and then dried in a 50-degree oven for 10 hours. After the obtained powder is broken, it is the precursor Fe of lithium-ion battery cathode material. 0.1 mn 0.9 HPO 4 ·3H 2 O.

[0030] Scanning electron microscope observation is carried out to the lithium-ion battery anode material precursor that obtains, the result is as follows figure 1 shown. from figure 1 It can be seen that the particle size D50 of the obtained lithium-ion battery cathode material precursor is 3.2...

Embodiment 2

[0033] According to the chemical formula Fe 0.2 mn 0.79 Ni 0.01 HPO 4 ·3H 2 O takes by weighing 2mol ferrous oxide, 7.9mol metal manganese and 0.1mol metal nickel and is dissolved in the mixed solution of 2000g deionized water and 40mol phosphoric acid, and continues to stir and mix 4 hours; The solution obtained is warming up to 90 degree of reaction 2 hours, Then 20,000 g of ethanol was slowly added to the system, and a precipitate was formed in the system at this time; the obtained precipitate was washed 3 times with deionized water and ethanol, and then dried in an oven at 80 degrees for 2 hours. After the obtained powder is broken, it is the precursor Fe of lithium-ion battery cathode material. 0.2 mn 0.79 Ni 0.01 HPO 4 ·3H 2 O.

Embodiment 3

[0035] According to the chemical formula Fe 0.3 mn 0.68 co 0.01 Mg 0.01 HPO 4 ·3H 2O take by weighing 0.3mol ferrous carbonate, 0.68mol manganese carbonate, 0.01mol cobalt carbonate and 0.01mol magnesium hydroxide and dissolve in the mixed solution of 300g deionized water and 2mol phosphoric acid, and keep stirring and mixing for 2 hours; React at 80°C for 3 hours, then slowly add 350g of methanol to the system, at this time, a precipitate occurs in the system; the obtained precipitate is washed with deionized water and ethanol for 3 times, and then dried in a 70°C oven for 3 hours. After the obtained powder is broken, it is the precursor Fe of lithium-ion battery cathode material. 0.3 mn 0.68 co 0.01 Mg 0.01 HPO 4 ·3H 2 O.

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Abstract

The invention discloses a lithium-ion battery cathode material and a preparation method thereof. Effective metal in a precursor of the prepared lithium-ion battery cathode material is uniform in distribution and has a single crystal structure; ammonia-nitrogen pollution is not generated in a technological process; the negative effects on the environment are low; the economic efficiency of raw materials is high; and the product cost is low. The preparation method disclosed by the invention is simple, convenient, and controllable in process; the product shape is high in uniformity; and batch production is easy to carry out on a large scale.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Olivine-type lithium iron manganese phosphate has the advantages of abundant raw material resources, low cost, and environmental friendliness, and has attracted more and more attention. The polyanion PO is present in the unit cell of the material 4 3- Therefore, lithium iron manganese phosphate has remarkable thermal stability and anti-overcharge ability, which makes lithium iron manganese phosphate safe and has a high discharge voltage platform (about 4.0V). Among the anode materials for lithium-ion batteries currently emphasizing safety, lithium iron manganese phosphate has good development prospects. [0003] In the current process of preparing olivine-type ammonium iron manganese phosphate or lithium iron phosphate, there is a certain deg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 张卫东黄长靓董彬彬唐春霞周恒辉陈继涛
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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