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A method for directly repairing lithium iron phosphate waste powder by fire method to prepare battery-grade lithium iron phosphate

A lithium iron phosphate, battery-grade technology, which is applied in the field of directly repairing lithium iron phosphate waste powder to prepare battery-grade lithium iron phosphate by fire method, can solve the problems of low economic value, high processing cost, long process, etc., to eliminate pollution and application. The effect of broad prospects and a large amount of recycling

Active Publication Date: 2020-09-08
ZHUZHOU SMELTER GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Other patents such as CN101847763A (a method for comprehensive recycling of waste lithium iron phosphate batteries), patent CN101916889A (method for preparing lithium iron phosphate by recycling waste lithium-ion power batteries in water systems), CN102208707A (a method for repairing and regenerating positive electrode materials of waste lithium iron phosphate batteries) method), patent 201010148325.6 (a method for comprehensive recycling of waste lithium iron phosphate batteries), etc., or all-wet method or wet method + fire method to obtain lithium iron phosphate products or to prepare lithium iron phosphate battery materials. The cost is relatively high, and there are different degrees of "three wastes" problems
Therefore, the current recovery of LiFePO 4 The method application and economic value of the positive electrode of lithium-ion batteries are low, and it is difficult to be practically promoted

Method used

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  • A method for directly repairing lithium iron phosphate waste powder by fire method to prepare battery-grade lithium iron phosphate
  • A method for directly repairing lithium iron phosphate waste powder by fire method to prepare battery-grade lithium iron phosphate
  • A method for directly repairing lithium iron phosphate waste powder by fire method to prepare battery-grade lithium iron phosphate

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Embodiment 1

[0045] like Figure 5 As shown, a method for directly repairing lithium iron phosphate waste powder fire method to prepare battery-grade lithium iron phosphate comprises the following steps:

[0046] Step A, oxidative roasting, put the ceramic crucible containing 15 kg of lithium iron phosphate positive electrode material into a roasting furnace, and roast it under air atmosphere conditions, the roasting temperature is 650 ° C, and the roasting time is 15 hours to obtain calcined sand. SEM picture of calcined sand figure 1 shown.

[0047] Step B, batching, add lithium source, iron source, phosphorus source to the calcined sand obtained in step A, make the molar ratio of lithium, iron, phosphorus in the calcined sand be adjusted to 1.03:1:1, add carbon source and As for the activator glycerin, the mass of the added carbon source is 18% of the mass of the calcine, and the mass of the added activator glycerin is 2% of the mass of the calcine. Wherein, the lithium source is lit...

Embodiment 2

[0053] A method for directly repairing and preparing battery-grade lithium iron phosphate by the fire method of waste powder of lithium iron phosphate comprises the following steps:

[0054] Step A, oxidative roasting, put a ceramic crucible containing 15 kg of lithium iron phosphate waste powder into a roasting furnace, and roast under an oxygen atmosphere at a roasting temperature of 850° C. for 6 hours to obtain calcined sand.

[0055] Step B, batching, add lithium source, iron source, phosphorus source to the calcined sand obtained in step A, adjust the molar ratio of lithium, iron, phosphorus in the calcined sand to 1.06:1:1, and then add starch and activator Glycerol, the quality that described starch adds is 16% of the quality of calcine, and the quality that described activator glycerin adds is 4% of the quality of calcine; Wherein, described lithium source is lithium carbonate, hydroxide Lithium, lithium oxalate, etc.; iron source is iron oxide, iron sulfate, etc.; ph...

Embodiment 3

[0061] A method for directly repairing and preparing battery-grade lithium iron phosphate by the fire method of waste powder of lithium iron phosphate comprises the following steps:

[0062] Step A, oxidation roasting, put the ceramic crucible equipped with 15 kg of lithium iron phosphate positive electrode separation material into the roasting furnace, and roast under the atmosphere of air, the roasting temperature is 750 ° C, and the roasting time is 10 hours to obtain calcined sand.

[0063] Step B, ingredients, add lithium source, iron source, phosphorus source to the calcined sand obtained in step A, adjust the molar ratio of lithium, iron, phosphorus in the calcined sand to 1.05:1:1, then add sucrose and activator Glycerol, the quality that described sucrose adds is 17% of the quality of calcine, and the quality that described activator glycerin adds is 3% of the quality of calcine. Wherein, the lithium source is lithium carbonate, lithium hydroxide, lithium oxalate, etc...

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Abstract

A method for directly repair waste lithium iron phosphate powder to prepare battery-grade lithium iron phosphate by fire method comprise that following steps: A, oxidizing roasting the waste lithium iron phosphate power in the atmosphere of air or oxygen to obtain calcine; B, preparing material, adding lithium source, iron source, phosphorus source, carbon source and activator into that calcine; C, performing ball milling, adding a dispersion medium to carry out high-speed ball mil activation and granulation; D, drying and volatilizing alcohol, and condensing to obtain recycled use; E, sintering: sintering under that protection of an inert gas; F, screenining and performing iron removal, and screening with a vibrating screen with a permanent magnet to obtain battery-grade lithium iron phosphate product. The direct repair method of the invention has the advantages of reasonable process, low production cost, no pollution, no toxicity and the like.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of lithium iron phosphate waste powder, in particular to a method for directly repairing lithium iron phosphate waste powder and fire to prepare battery-grade lithium iron phosphate. Background technique [0002] In recent years, China has become the largest producer of lithium batteries. Since 2012, with the outbreak of new energy vehicles, the demand for power batteries has exploded. Especially on January 14, 2017, the Ministry of Industry and Information Technology took the lead in compiling the "Medium and Long-term Development Plan for the Automobile Industry", which clarified that by 2020, the annual output of new energy vehicles in my country will reach 2 million, and that by 2025, the sales volume of new energy vehicles in my country will account for the total sales volume. At the same time, in September 2017, the person in charge of the Ministry of Industry and Information Technology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/58C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/5825H01M10/54Y02E60/10Y02W30/84
Inventor 周玉琳廖贻鹏林文军张桂海刘敏戴慧敏王勇易鹏飞唐亦秋彭双义高盟
Owner ZHUZHOU SMELTER GRP
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