Method for recycling lithium iron phosphate wastes in manufacturing link of lithium iron phosphate batteries

A lithium iron phosphate battery, lithium iron phosphate technology, applied in battery recycling, recycling technology, waste collector recycling and other directions, can solve the problems of low recycling rate, production loss, increase production cost, etc., to achieve recycling rate High, low cost, good electrochemical performance

Active Publication Date: 2015-02-18
SHANDONG SACRED SUN POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the manufacturing process of the existing lithium iron phosphate battery, the active material lithium iron phosphate, a conductive agent and a binder are generally mixed in a solvent to make a slurry, which is evenly coated on the aluminum foil of the current collector by using a coating equipment, while in During the coating and subsequent slitting process, it is inevitable to produce waste pole pieces and scraps that do not meet the process req

Method used

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  • Method for recycling lithium iron phosphate wastes in manufacturing link of lithium iron phosphate batteries
  • Method for recycling lithium iron phosphate wastes in manufacturing link of lithium iron phosphate batteries
  • Method for recycling lithium iron phosphate wastes in manufacturing link of lithium iron phosphate batteries

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Embodiment １

[0030] Neatly stack 20Kg of lithium iron phosphate cathode sheets to be recovered in a stainless steel tray, put them into a muffle furnace, heat up to 500°C, and bake for 2 hours. The binder PVDF will decompose and fail, and the active material lithium iron phosphate and conductive The conductive agent powder completely falls off from the aluminum foil of the current collector; then, put the obtained powder into a muffle furnace, bake at 700°C for 5 hours to remove the conductive agent, and pass through a 250-mesh sieve to obtain lithium iron phosphate powder. Lithium iron phosphate material contains other impurities, poor electrochemical performance, poor availability, and needs to be purified. Take 7Kg from the above-mentioned lithium iron phosphate powder, wash 3 times with 70 Kg of deionized water, add 40 Kg of 1% ethanol solution, stir into a uniform suspension, then add 9.8 Kg of iron nitrate, 4.567 Kg Ammonium dihydrogen phosphate, 1.703 Kg lithium hydroxide monohydrat...

Embodiment 2

[0032] Neatly stack 10Kg of lithium iron phosphate cathode sheets to be recovered in a stainless steel tray, put them into a muffle furnace, heat up to 600°C, and bake for 3 hours. The binder LA133 will decompose and fail, and the active material lithium iron phosphate and conductive The conductive agent powder is completely detached from the current collector aluminum foil; then, the obtained powder is put into a muffle furnace, baked at 800°C for 4 hours to remove the conductive agent, and passed through a 325-mesh screen to obtain lithium iron phosphate powder. Take 2Kg of lithium powder, wash 3 times with 24Kg of deionized water, add 16Kg of 1% ethanol solution, stir into a uniform suspension, then add 4.895Kg of iron sulfate, 2.818 Kg of diammonium hydrogen phosphate, 0.923 Kg of lithium carbonate, mixed with zirconia balls, ball milled for 6 hours, and vacuum-dried at 100°C. Finally, put it in a nitrogen-protected tube furnace and bake it at 650°C for 6 hours, and then c...

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Abstract

The invention discloses a method for recycling lithium iron phosphate wastes in the manufacturing link of lithium iron phosphate batteries and relates to lithium ion batteries. The recycling method is characterized by comprising the following steps: after a pole piece to be recycled is put into a muffle furnace, baking is performed for 2-3h at the temperature of 400-600 DEG C, the decomposition of a binder fails, and an active material lithium iron phosphate and conductive agent powder completely fall off from a current collector aluminum foil; after the powder is put in the muffle furnace, baking is performed for 4-6h at the temperature of 650-800 DEG C, sieving is performed to obtain lithium iron phosphate power; filtering is performed, the lithium iron phosphate power is washed with deionized water, and an ethanol wetting agent after washing is added to obtain turbid liquid; soluble lithium salt, molysite and phosphate are proportionally mixed into an ethanol solution, the mixed solution is added into the turbid liquid for mixing, and vacuum drying is performed at the temperature of 120-140 DEG C; roasting is performed for 3-6h at the temperature of 650-850 DEG C in an inert gas atmosphere to obtain acceptable materials. The method has the advantages of being good in electrochemical performance of recycled materials, high in reuse rate and low in cost.

Description

technical field [0001] The invention relates to the manufacture of lithium ion batteries, and more specifically to a method for recycling and reusing lithium iron phosphate waste in the manufacturing process of lithium iron phosphate batteries. Background technique [0002] Lithium-ion batteries are widely used in portable devices, mobile power supplies, large electric vehicles, communication power supplies, and other fields due to their high operating voltage, high energy density, wide temperature range, long life, no memory effect, and environmental protection. application prospects. The structure of a lithium-ion battery is mainly composed of positive and negative electrodes, a separator, an electrolyte, and a casing. According to the manufacturing process of the existing lithium iron phosphate battery, the active material lithium iron phosphate, a conductive agent and a binder are generally mixed in a solvent to make a slurry, which is evenly coated on the current colle...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 张虎徐红新吴强
Owner SHANDONG SACRED SUN POWER SOURCES
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