Method for regenerating lithium iron phosphate waste

A technology of lithium iron phosphate and waste, applied in the field of regeneration of lithium iron phosphate waste, can solve the problems of increasing the recovery cost, loss of valuable components, and reducing the recovery rate, and achieves the effects of improving quality, inhibiting growth rate, and shortening the process.

Active Publication Date: 2019-05-31
湖南泰和美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

However, when this process is dissolved, the carbon source needs to be removed in the form of impurities. On the one hand, the carbon source is used as a conductive coating material, which basically belongs to a thin sheet with a thickness of 1~5nm, which has strong adsorption, and it is easy to cause lithium, iron, etc. The loss of valuable components such as lithium, phosphorus, etc. cannot efficiently utilize all lithium, iron, and phosphorus, reducing the recovery rate; on the other hand, the carbon source obtained by filtration contains acidic liquid, which can only be treated as hazardous chemicals, which increases the recovery cost. At the same time, it causes unnecessary waste of resources

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  • Method for regenerating lithium iron phosphate waste
  • Method for regenerating lithium iron phosphate waste

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Experimental program
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Effect test

Embodiment 1

[0030] The lithium iron phosphate production material lacking lithium (unqualified ratio) was taken for component analysis. The test results showed that the main components of the waste were: lithium 3.91%wt, iron 33.46%wt, phosphate radical 58.5%wt, carbon 2.24%wt. And 2.09%wt other unavoidable trace elements. According to the composition, mix the waste material and hydrochloric acid in a molar ratio of 1:4, weigh 643.10 mass parts of waste material, 1600 mass parts of concentrated hydrochloric acid (analytical pure, hydrochloric acid content is 36.5%wt), 3416 mass parts of deionized water, and make hydrogen The acid solution with an ion concentration of 1.0 mol / L was stirred and dissolved at room temperature for 2 hours under the protection of nitrogen. The ferric iron content was measured to be 0.13%wt. The molar ratio of lithium:iron:phosphorus is 1:1.06:1.08, and the ratio needs to be adjusted. Add 10.46 parts by mass of lithium chloride (analytically pure, with a conten...

Embodiment 2

[0033] The carbon-deficient and carbon-rich (unqualified ratio) lithium iron phosphate production materials were taken for component analysis. The test results showed that the main components of the waste were: 4.32%wt of lithium in the carbon-deficient waste, 34.26%wt of iron, 60.07%wt of phosphate, carbon 0.66%wt. And 0.69%wt other unavoidable trace elements; carbon-rich waste 4.22%wt lithium, 33.86%wt iron, 58.11%wt phosphate, 3.26%wt carbon. And 0.55%wt other unavoidable trace elements. According to the composition, the carbon-deficient and carbon-rich waste materials can be designed into lithium iron phosphate with a carbon content of 1.96% in the final product. Therefore, take by weighing 645.30 mass parts of waste material (carbon-rich waste material, carbon-deficient waste material respectively claim 322.65 mass parts), waste material and sulfuric acid are 1:1.5 batching with molar weight, concentrated sulfuric acid 600 mass parts (analytical pure, sulfuric acid conte...

Embodiment 3

[0036] The raw material of lithium iron phosphate whose performance is not up to standard (abnormal sintering process) was taken for component analysis. The test results show that the main components of the waste are: 4.31%wt, iron 34.25%wt, phosphate radical 60.05%wt, carbon 1.21%wt. And 0.18% w other unavoidable trace elements. According to the composition, mix the waste material and hydrochloric acid in a molar ratio of 1:4, weigh 643.60 mass parts of waste material, 1600 mass parts of concentrated hydrochloric acid (analytical pure, hydrochloric acid content is 36.5%wt), 7847 mass parts of deionized water, and make hydrogen The acid solution with an ion concentration of 0.5 mol / L was stirred and dissolved at room temperature for 2 hours under the protection of nitrogen. The ferric iron content was measured to be 0.32%wt. The molar ratio of lithium:iron:phosphorus is 1:0.98:1.012, no need to adjust the ratio, just reduce the ferric iron, add 4.3 parts by mass of ascorbic a...

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Abstract

The invention discloses a method for regenerating lithium iron phosphate waste and belongs to the technical field of methods and devices for directly converting chemical energy into electric energy. The method comprises five steps of dissolution, composition adjustment, reduction, carbon adjustment and coprecipitation. In the method, after the carbon-coated lithium iron phosphate waste is directlydissolved, an aromatic ring and a hydrophilic group in a dispersing agent are connected through a long carbon chain, and the non-directly connected state can not only firmly absorb thin carbon particles, but also can wrap the carbon, thereby reducing the influence of nucleation and growth during carbon pair coprecipitation, assisting in the rate of alkali addition, adjusting the rising rate of pH, increasing a nucleation rate, suppressing a growth rate, and increasing the quality of the coprecipitation. Finally, the dispersing agent is decomposed by sintering to achieve carbon source coatingsynthesis, and generate lithium iron phosphate having excellent performance.

Description

technical field [0001] The invention belongs to the technical field of methods and devices for directly converting chemical energy into electrical energy, and in particular relates to a regeneration method for lithium iron phosphate waste. Background technique [0002] Lithium iron phosphate cathode material is widely used in new energy vehicles, energy storage batteries and other fields due to its low price, environmental friendliness and excellent safety performance. However, in the process of producing lithium iron phosphate, often due to the imbalance of the ratio and the fault of the process, there will inevitably be waste. These wastes are of high purity and are not as complex as lithium iron phosphate in waste batteries, but basically maintain the same elements as qualified lithium iron phosphate. Therefore, recycling waste and old lithium iron phosphate will lead to waste of resources, Disadvantages such as low added value and long process. [0003] Aiming at this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/58C01B25/45
CPCY02E60/10Y02W30/84
Inventor 胡茂宅
Owner 湖南泰和美新能源科技有限公司
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