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Iron oxide for lithium iron phosphate battery, and its preparation method

A lithium iron phosphate battery, iron oxide technology, applied in iron oxide, iron oxide/iron hydroxide and other directions, can solve the problems of high cost and emission pollution of nano-pulverization technology, and achieve good consistency, low energy consumption, and yield high effect

Inactive Publication Date: 2012-11-21
SHANGHAI BAOSTEEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the co-precipitation method and nano-grinding technology are costly and the emission pollution is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a) First, heat the waste acid after pickling the steel plate to 70°C. After heating, put the waste acid solution into the dissolution tank, and add the scrap iron side into the dissolution tank at the same time. The waste acid enters from the bottom of the dissolution tank. During the rising process, The free acid in the spent acid reacts with iron to form ferric chloride.

[0034] b) The spent acid is cooled from the top of the dissolution tank to 30°C through a cooler, and flows to the reaction tank by itself after cooling. Continuously add 20% ammonia solution to the ammonia reaction tank from the ammonia metering pump to increase the pH value of the waste acid to 5.0. The waste acid is oxidized to trichloride by adding compressed air while stirring continuously. Iron and converted into iron hydroxide, iron hydroxide particles will SiO in waste acid 2 Particles pack together to form flocs of small particles.

[0035] c) In order to make the flocs grow into large pa...

Embodiment 2

[0045] a) First, heat the waste acid after pickling the steel plate to 60°C. After heating, put the waste acid solution into the dissolution tank, and add the scrap iron side into the dissolution tank at the same time. The waste acid enters from the bottom of the dissolution tank. During the rising process, The free acid in the spent acid reacts with iron to form ferric chloride.

[0046]b) The spent acid is cooled from the top of the dissolution tank to 40°C by a cooler, and flows to the reaction tank by itself after cooling. Continuously add 20% ammonia solution to the ammonia reaction tank from the ammonia metering pump to increase the pH value of the waste acid to 4.5. The waste acid is oxidized to trichloride by adding compressed air while stirring continuously. Iron is converted into iron hydroxide, and the iron hydroxide particles wrap the SiO2 particles in the waste acid and combine to form small particle flocs.

[0047] c) In order to make the flocs grow into large p...

Embodiment 3

[0058] a) First, heat the waste acid after pickling the steel plate to 80°C. After heating, put the waste acid solution into the dissolution tank, and add the scrap iron side into the dissolution tank at the same time. The waste acid enters from the bottom of the dissolution tank. During the rising process, The free acid in the spent acid reacts with iron to form ferric chloride.

[0059] b) The spent acid is cooled from the top of the dissolution tank to 20°C through a cooler, and flows to the reaction tank by itself after cooling. Continuously add 20% ammonia solution to the ammonia reaction tank from the ammonia metering pump to increase the pH value of the waste acid to 4.0. The waste acid is oxidized into trichloride by adding compressed air while stirring continuously. Iron is converted into iron hydroxide, and the iron hydroxide particles wrap the SiO2 particles in the waste acid and combine to form small particle flocs.

[0060] c) In order to make the flocs grow into...

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Abstract

The invention discloses iron oxide for a lithium iron phosphate battery material, and its preparation method. The preparation method mainly comprises the following steps: 1, removing impurities from a steel plate pickling waste liquid to reduce the contents of impurities comprising SiO2, P2O5, Al2O3 and the like in iron oxide; 2, carrying out low temperature roasting of the impurities removed pickling waste liquid to improve physical performances of the iron oxide; 3, grinding with a pearl mill until the average particle size of the iron oxide reaches below 0.5mum; and 4, washing the iron oxide slurry obtained after the grinding with desalinized water, and carrying out treatments comprising press filtration, drying, crushing and the like. According to the invention, the contents of the impurities comprising SiO2, P2O5, Al2O3, Cl<->, Ca<2+>, K<+>, Na<+>, SO4<2-> and the like in the iron oxide are greatly reduced; and the physical performances comprising the specific surface area (BET), the loose specific weight, the average particle size particle size reduction and the like of the iron oxide are improved,

Description

[0001] technical field [0002] The invention relates to iron oxide for lithium iron phosphate batteries and a preparation method thereof, belonging to the field of battery materials. [0003] Background technique [0004] The continuous development of new energy is an important foundation and inevitable result of the sustainable development of human society. Lithium-ion batteries developed in recent years have been widely used and represent the future fields of electric vehicles, electric bicycles, electric tools and power generation and energy storage devices. The most important new energy development direction. In particular, the lithium iron phosphate material is recognized as the preferred cathode material for the new generation of lithium-ion power batteries due to its good safety, excellent cycle performance, environmental friendliness, and abundant raw material resources. It has become the research focus and development of various countries in the world today. dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 陈元峻冯炜徐辉宇丁雪良黄华特
Owner SHANGHAI BAOSTEEL MAGNETICS
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