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Preparation method of lithium iron phosphate with high compaction density and high capacity

A lithium iron phosphate and iron phosphate technology, which is applied in the field of positive electrode materials for lithium ion batteries, can solve problems such as affecting the performance of the electrical properties of materials, decline in electrical properties, and greatly improve the compaction density of lithium iron phosphate materials, so that the electrical properties are not affected. Influence, energy density increase, effect of high compaction characteristics

Active Publication Date: 2019-08-06
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of organic or inorganic carbon sources during the synthesis of lithium iron phosphate and the steric hindrance formed by the barrier of carbon during the sintering process, it is difficult for the primary particles of lithium iron phosphate to grow effectively during this synthesis process, and it is difficult to greatly There are technical problems such as improving the compaction density of lithium iron phosphate materials. At the same time, the traditional method of blindly increasing the compaction density by increasing the size of the primary particles ultimately hinders the deintercalation of lithium ions due to the excessive size of the primary particles, which affects the electrical performance of the material, resulting in Decreased electrical performance

Method used

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  • Preparation method of lithium iron phosphate with high compaction density and high capacity
  • Preparation method of lithium iron phosphate with high compaction density and high capacity
  • Preparation method of lithium iron phosphate with high compaction density and high capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1: add 670kg of ferrous sulfate heptahydrate in the dissolving tank, 1.2kg of titanium sulfate and 1648.8kg of pure water, stir and dissolve completely and be mixed with iron content and be 5.8%, titanium content is 0.01% (by mass percentage) Mixed solution of ferrous sulfate. Add 277kg of ammonium dihydrogen phosphate and 1343kg of pure water in the dissolving tank, stir and dissolve completely and then prepare an ammonium dihydrogen phosphate solution with a phosphorus content of 4.6% (by mass percentage).

[0045]Step 2: Add 2320kg of the prepared ferrous sulfate mixed solution, 1620kg of ammonium dihydrogen phosphate solution, 145kg of hydrogen peroxide with a mass concentration of 30%, and 6kg of ammonia water with a mass concentration of 25% into the reaction kettle with a stirring speed of 300rpm at the same time To carry out the reaction, control the pH of the reaction slurry to 1.9, and control the reaction temperature to 50°C. After reacting for 4 hours, ...

Embodiment 2

[0050] Step 1: add 670kg of ferrous sulfate heptahydrate in the dissolving tank, 0.7kg of titanium sulfate and 2021.3kg of pure water, stir and dissolve completely and be formulated with iron content as 5.0%, titanium content as 0.005% (by mass percentage) Mixed solution of ferrous sulfate. Add 277kg ammonium dihydrogen phosphate and 1588kg pure water in the dissolving tank, stir and dissolve completely, and then prepare an ammonium dihydrogen phosphate solution with a phosphorus content of 4.0% (by mass percentage).

[0051] Step 2: Add 2692kg of the prepared ferrous sulfate mixed solution, 1865kg of ammonium dihydrogen phosphate solution, 147kg of hydrogen peroxide with a mass concentration of 30%, and 7kg of ammonia water with a mass concentration of 25% into the reaction kettle with a stirring speed of 250rpm at the same time To carry out the reaction, control the pH of the reaction slurry to 2.0, and control the reaction temperature to 60°C. After reacting for 6 hours, ad...

Embodiment 3

[0056] Step 1: add 670kg of ferrous sulfate heptahydrate in the dissolving tank, 1.4kg of magnesium sulfate and 2130.6kg of pure water, after stirring and dissolving completely, be mixed with iron content and be 4.8%, magnesium content is 0.01% (by mass percentage) Mixed solution of ferrous sulfate. Add 277kg of ammonium dihydrogen phosphate and 1686kg of pure water in the dissolving tank, stir and dissolve completely, and then prepare an ammonium dihydrogen phosphate solution with a phosphorus content of 3.8% (by mass percentage).

[0057] Step 2: 2802kg of the prepared ferrous sulfate mixed solution, 1963kg of ammonium dihydrogen phosphate solution, 140kg of hydrogen peroxide with a mass concentration of 30%, and 8kg of ammonia water with a mass concentration of 25% are simultaneously added dropwise to the reaction kettle with a stirring speed of 250rpm To carry out the reaction, control the pH of the reaction slurry to 2.2, control the reaction temperature to 40°C, and afte...

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Abstract

The invention provides a preparation method of lithium iron phosphate. Large single-crystal iron phosphate is prepared by the method and by using a fluxing agent, thereby being increased in compactiondensity. By doping the iron phosphate in an iron phosphate stage, a lithium iron phosphate capacity is increased. The method solves the drawbacks in a conventional method, and increases the dischargecapacity of the lithium iron phosphate while increasing its compaction density.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and specifically provides a preparation method for producing lithium iron phosphate with high compaction density and high capacity through compaction and sintering of lithium iron phosphate positive electrode materials. Background technique [0002] With the advancement of science and technology and the development of the economy, lithium-ion batteries are used more and more widely. Lithium-ion batteries made of lithium iron phosphate materials have extremely high safety, long cycle life, high reliability and low cost, and have become the mainstream of automotive power batteries and energy storage batteries in my country. Currently commercial lithium iron phosphate materials generally have low compaction density (2.3g / cm 3 left and right), which directly leads to the low energy density of the prepared lithium iron phosphate battery, so the compaction density o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825Y02E60/10
Inventor 吴永生温益凡
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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