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Method for preparing lithium ion battery positive electrode material and precursor thereof through high-temperature and high-pressure steam pretreatment

A lithium-ion battery, high temperature and high pressure technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as pollution, increase production costs, increase process complexity, etc., achieve simple production process, reduce particle size of raw materials , powder compaction and discharge capacity enhancement

Inactive Publication Date: 2020-07-03
协鑫高新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, two steps of low-temperature pre-calcination and high-temperature sintering are carried out in the process of preparing lithium iron phosphate. The raw materials need to be wet-mixed twice, and ammonium dihydrogen phosphate is used in the raw materials to cause environmental pollution during the sintering process, which also increases Increased process complexity and increased production costs

Method used

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  • Method for preparing lithium ion battery positive electrode material and precursor thereof through high-temperature and high-pressure steam pretreatment
  • Method for preparing lithium ion battery positive electrode material and precursor thereof through high-temperature and high-pressure steam pretreatment
  • Method for preparing lithium ion battery positive electrode material and precursor thereof through high-temperature and high-pressure steam pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put lithium carbonate, iron oxide, and ammonium dihydrogen phosphate in accordance with Li, Fe, PO 4 Add 1 mol each, and then add 0.02 mol glucose to dry and mix uniformly. After mixing, add zirconia media ball mill and mix for 3 hours. Then, use steam jet mill at 250°C and 1Mpa pressure to crush the precursor powder. The precursor powder is put into a box furnace under the protection of nitrogen, and the temperature is raised to 720°C at a rate of 15°C / min. After a constant temperature of 8 hours, it is naturally cooled to room temperature and taken out to obtain the cathode material LiFePO. 4 / C.

[0029] Take 50g cathode material LiFePO 4 / C powder, put it into the XL-185 powder compaction density tester, with a pressure of 3 tons, the material's split compaction density is 2.46g / cm 3 .

[0030] LiFePO 4 / C powder, acetylene black, and PVDF are mixed uniformly according to the mass ratio of 87:8:5, and then coated on 0.02mm aluminum foil, and then fully dried to obtain the...

Embodiment 2

[0032] Put lithium carbonate, iron oxide, ammonium dihydrogen phosphate according to Li, Fe, PO 4 Add 1 mol each, and then add 0.02 mol glucose to dry mix uniformly. After mixing, add zirconia media ball mill and mix for 3 hours. Then, use steam jet mill at 300℃ and 1Mpa pressure to crush the precursor powder. The precursor powder is put into a box furnace under the protection of nitrogen, and the temperature is raised to 720°C at a rate of 15°C / min. After a constant temperature of 8 hours, it is naturally cooled to room temperature and taken out to obtain the cathode material LiFePO 4 / C.

[0033] Take 50g cathode material LiFePO 4 / C powder, put it into the XL-185 powder compaction density tester, with a pressure of 3 tons, the material's split compaction density is 2.49g / cm 3 .

[0034] LiFePO 4 / C powder, acetylene black, and PVDF are mixed uniformly according to the mass ratio of 87:8:5, and then coated on 0.02mm aluminum foil, and then fully dried to obtain the positive pole p...

Embodiment 3

[0036] Put lithium carbonate, iron oxide, ammonium dihydrogen phosphate according to Li, Fe, PO 4 Add 1mol each, then add 0.02mol glucose, dry mix uniformly, add zirconia media ball mill and mix for 3h after mixing, and then crush in a steam jet mill at 250℃, 1.5Mpa steam pressure to obtain the precursor Powder, put the precursor powder into a box furnace under the protection of nitrogen, raise it to 720°C at 15°C / min, keep it at a constant temperature for 8 hours, then cool it to room temperature naturally and take it out to obtain the cathode material LiFePO 4 / C.

[0037] Take 50g cathode material LiFePO 4 / C powder, put it into the XL-185 powder compaction density tester, with a pressure of 3 tons, the material's split compaction density is 2.55g / cm 3 .

[0038] LiFePO 4 / C powder, acetylene black, and PVDF are mixed uniformly according to the mass ratio of 87:8:5, and then coated on 0.02mm aluminum foil, and then fully dried to obtain the positive pole piece, and then packed in...

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Abstract

The invention discloses a method for preparing a lithium ion battery positive electrode material and a precursor thereof through high-temperature and high-pressure steam pretreatment. The method comprises the following steps: uniformly mixing a lithium source, an iron source, a phosphorus source and a carbon source by adopting a dry method, adding into a ball mill for mixing and ball milling, introducing into a steam jet mill, performing high-temperature high-pressure steam crushing and carbon source pre-coking to obtain a precursor, and sintering to obtain the lithium ion battery positive electrode material. High-temperature and high-pressure steam crushing is adopted; through carbon source pre-coking treatment, feedstock particle size is reduced, the material electronic conductivity andionic conductivity are improved, the final sintered product is uniform in particle distribution, the average particle size is 100-200 nm, the compaction density of the prepared sample powder can reach2.55 g / cm < 3 >, and the first specific discharge capacity of a battery filled with the prepared sample can reach 162.2 mAh / g. The powder compaction and discharge capacity of the material are obviously improved, and the method is suitable for industrial production.

Description

Technical field [0001] The invention relates to a method for preparing a lithium ion battery positive electrode material and a precursor thereof by high temperature and high pressure steam pretreatment, and belongs to the technical field of lithium ion battery positive electrode materials. Background technique [0002] With the promotion and development of national new energy policies, lithium batteries, as a new energy carrier, are developing rapidly. [0003] The currently commercialized cathode materials such as lithium cobalt oxide and lithium nickel cobalt manganese oxide have the advantages of higher capacity and long cycle life, but cobalt resources are scarce, expensive and toxic, while LiNiO 2 There are safety issues and harsh preparation conditions, LiMn 2 O 4 The cycle performance and high temperature performance of LiFePO still need to be improved greatly. 4 It has the advantages of high theoretical capacity, high voltage, rich source of raw materials, low price, environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 陈太军徐操王岳松傅阗晨王祥远
Owner 协鑫高新材料科技有限公司
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