Regeneration method for waste lithium ion phosphate positive pole material

A positive electrode material, lithium iron phosphate technology, applied in the field of regeneration of lithium iron phosphate positive electrode material waste, can solve environmental pollution, increase battery production costs and other issues, achieve low cost, avoid improper handling, and reduce overall costs.

Inactive Publication Date: 2009-03-25
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of a large amount of waste not only increases the production cost of batteries, but also pollutes the environment if the waste is not handled properly

Method used

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  • Regeneration method for waste lithium ion phosphate positive pole material
  • Regeneration method for waste lithium ion phosphate positive pole material
  • Regeneration method for waste lithium ion phosphate positive pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put the lithium iron phosphate cathode material waste produced in the production of the 053448A battery of our company in a drying oven, and dry it at 120°C for 10 hours to remove the moisture and solvent absorbed in the waste. Use a mill to mill the dried waste for 6 hours, and then classify the ball milled powder. According to the production process requirements of our company's 053448A battery, the collected particle size is not greater than 20 μm, D 50 The ball milling powder controlled at 3 μm ~ 10 μm (the rest of the ball milling powder can be ball milled and classified again) can obtain the regenerated positive electrode material, and its XRD pattern is as follows Figure 4 Shown, the XRD figure ( figure 1 ) comparison, the positions of the characteristic peaks are basically the same, just because the regenerated positive electrode material obtained by the method of the present invention contains a certain amount of conductive agent and binder, the background of ...

Embodiment 2

[0030] Put the lithium iron phosphate cathode material waste produced in the production of the 053448A battery of our company in a drying oven, and dry it at a temperature of 80°C for 12 hours to remove the moisture and solvent absorbed in the waste. Use a mill to mill the dried waste for 1 hour, and then classify the ball milled powder. According to the production process requirements of our company's 053448A battery, the collected particle size is not greater than 20 μm, D 50 The ball milling powder controlled at 3 μm to 10 μm (the rest of the ball milling powder can be re-classified by ball milling), and the collected ball milling powder was heat-treated for 15 hours under the conditions of an inert atmosphere of argon and a temperature of 400°C. The heat-treated product is crushed and pulverized by a crusher and a pulverizer, and the collected particle size is not greater than 20 μm, D 50 Ball milling powder controlled at 3 μm ~ 10 μm (the rest of the ball milling powder c...

Embodiment 3

[0032] The difference from Example 2 lies in: the drying temperature is 200°C, and the drying time is 0.5h; the dried waste is ball milled for 10h; the heat treatment temperature is 700°C, and the heat treatment time is 1h. The XRD pattern of lithium iron phosphate regenerated cathode material obtained in this example is as follows Figure 10 shown. Using the regenerated lithium iron phosphate positive electrode material obtained in this example as the positive electrode material, the finished battery is produced according to the proportion and process in Example 1. The 1C cycle performance of the battery is shown in the figure Figure 11 shown. Compared figure 1 and Figure 10, according to the peak intensity (ordinate), it can be seen that the residual carbon and binder content in the regenerated lithium iron phosphate positive electrode material obtained in this example is the same as that in the regenerated lithium iron phosphate positive electrode material obtained in ...

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Abstract

The invention provides a method for regenerating waste materials of positive materials of ferric phosphate lithium. The method comprises the following steps: firstly, the waste materials of the positive materials of the ferric phosphate lithium are dried for 0.5h to 12.0h at 80 to 200 DEG C; secondly, the dried waste materials of the positive materials of the ferric phosphate lithium are crushed to the extent that the composition of the grain sizes accords with the preparation requirements on a positive sizing agent of the ferric phosphate lithium. Positive regeneration materials of the ferric phosphate lithium processed by using the method have similar electrochemistry performance as normal materials. The method has the advantages that the process is simple, the implementation is convenient, and the cost is low. By adopting the method, the recycling and the reutilization of the waste materials of the positive materials of the ferric phosphate lithium can be easily realized; the overall cost of the battery production is reduced; the environmental pollution caused by improperly processing the waste materials of the positive materials of the ferric phosphate lithium is avoided.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion secondary battery, in particular to a method for regenerating waste materials of the positive electrode material of lithium iron phosphate. Background technique [0002] In lithium iron phosphate LiFePO 4 In the production process of lithium-ion batteries, which are positive electrode materials, dry powder, unstirred slurry and adhesive materials will remain on the equipment wall during the batching process; agglomerated materials or large particles will be separated during the slurry sieving process; coating process Remnants or leaking slurry can also occur; for small businesses that do not have new coaters, there is also a lot of blade waste. For the waste of these lithium iron phosphate cathode materials, the usual practice in current production practice is to discard them directly. The production of a large amount of waste not only increases the production cost of the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M6/52H01M4/04B09B3/00C01B25/45
CPCY02W30/84
Inventor 唐红辉唐联兴周冬王弗刚袁德勇
Owner SHENZHEN BAK BATTERY CO LTD
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