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Repair and regeneration method of waste battery positive electrode material

A technology for positive electrode materials and waste batteries, applied in battery electrodes, battery recycling, circuits, etc., can solve problems such as difficulty in ensuring mixing, resource waste and environmental impact, and affect the electrochemical performance of positive electrode materials, so as to achieve good electrochemical performance and improve Effect of degree of mixing and degree of infiltration

Active Publication Date: 2018-05-25
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the recycling rate of batteries in our country is less than 2%, it leads to waste of resources and environmental pollution
Compared with the conventional method of synthesizing positive electrode materials, due to the small amount of re-supplemented lithium under this condition, it is difficult to ensure the mixing degree of the two during the mechanical mixing process, which directly affects the sintering process (Li above 720 °C). 2 CO 3 In liquid state) Li 2 CO 3 The wettability of the positive electrode material leads to the phenomenon of high local lithium concentration, which in turn affects the electrochemical performance of the regenerated positive electrode material

Method used

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  • Repair and regeneration method of waste battery positive electrode material
  • Repair and regeneration method of waste battery positive electrode material
  • Repair and regeneration method of waste battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Take 100g of LiCoO separated from used batteries 2 The positive electrode material, the molar ratio of Li / M measured by ICP is 0.92:1, according to the standard Li / M ratio of the positive electrode material in normal batteries of 1.05 and the measured Li / M ratio of 0.92, and the total amount of the positive electrode material to be repaired 100g, add 0.13molLi per mole of cobalt metal to weigh out 5gLi 2 CO 3 The powder is used as the lithium source, the cathode material to be repaired and the lithium source powder total 105g, and the two will not be mixed temporarily;

[0024] 2) According to 0.8wt.% of the total weight in step 1), weigh 0.84g of ammonium polyacrylate as a dispersant, and combine the ammonium polyacrylate with Li 2 CO 3 The powder and water are mixed according to the solid-liquid ratio of 1:8 to form a mixed solution;

[0025] 3) Add 100 g of the positive electrode material to be repaired in step 1) to the mixed solution in step 2), and evaporate to dryne...

Embodiment 2

[0035] 1) Take 100g of LiCoO separated from used batteries 2 Cathode material, the molar ratio of Li / M measured by ICP is 0.92:1, according to the standard Li / M ratio of the positive electrode material in normal batteries of 1.04 and the measured Li / M ratio of 0.92, and the total amount of the positive electrode material to be repaired 100g, add 0.12mol Li per mole of cobalt metal to weigh out 4.5g Li 2 CO 3 Powder, the cathode material to be repaired and the lithium source powder total 104.5g, and the two will not be mixed temporarily;

[0036] 2) According to 1wt.% of the total weight in step 1), weigh 1.05g polyethylene glycol (PEG, molecular weight 400) as a dispersant, and combine polyethylene glycol (PEG) and Li 2 CO 3 The powder and water are mixed according to the solid-liquid ratio of 1:10 to form a mixed solution;

[0037] 3) Add 100g of the positive electrode material in step 1) to the mixed solution in step 2), and evaporate to dryness under constant stirring and ultraso...

Embodiment 3

[0044] 1) Take 100g of LiNi separated from used batteries 0.5 Co 0.2 Mn 0.3 O 2 The positive electrode material, the molar ratio of Li / M measured by ICP is 0.90:1, according to the standard Li / M ratio of positive electrode material in normal batteries of 1.02 and the measured Li / M ratio of 0.90, and the total amount of positive electrode material to be repaired 100g, add 0.12molLi per mole of cobalt metal to weigh out 4.4gLi 2 CO 3 Powder, total 104.4g, and do not mix temporarily;

[0045] 2) According to 0.7wt.% of the total weight in step 1), weigh 0.37g polyethylene glycol (PEG) and isopropanol as dispersants, and combine polyethylene glycol (PEG), isopropanol and Li 2 CO 3 The powder and water are mixed according to the solid-to-liquid ratio of 1:5 to form a mixed solution;

[0046] 3) Add 100g of the positive electrode material in step 1) to the mixed solution in step 2), and evaporate to dryness under constant stirring and ultrasound (ultrasonic power 450W) to obtain a homogen...

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Abstract

The invention provides a waste battery positive electrode material restoration regeneration method. The method comprises the following steps: 1, determining the Li / M ratio of a positive electrode material to be restored, weighing supplemented lithium source powder, and calculating the total weight of the positive electrode material to be restored and the lithium source powder; 2, weighing a dispersant according to the total weight, and mixing the dispersant, the lithium source powder and water to form a mixed solution; 3, adding the positive electrode material, and evaporating the mixed solution and the positive electrode material under continuous stirring and ultrasonic conditions until dryness in order to obtain mixture powder; 4, placing the mixture powder in a muffle place, heating the muffle furnace to a first high temperature range according to a first rate, keeping the first high temperature range for a certain period of time, heating the muffle furnace to a second high temperature range according to a second rate, keeping the second high temperature range until a prescribed time is reached, and naturally cooling the heated mixture powder to obtain a restored positive electrode material; and 5, sequentially crushing the restored positive electrode material, and sieving the crushed restored positive electrode material to obtain a regenerated positive electrode material. The method can effectively improve the mixing uniformity and the wettability of the positive electrode material and the lithium source to make the regenerated material have good electrochemical performances.

Description

Technical field [0001] The invention relates to a method for recycling waste batteries, in particular to a method for repairing and regenerating cathode materials in waste batteries. technical background [0002] With the rapid development of new energy vehicles, it is estimated that by 2020, the total amount of scrapped power batteries in my country will reach 120,000 to 170,000 tons. As the recycling rate of batteries in my country is less than 2%, it leads to waste of resources and environmental pollution. Moreover, the prices of core raw materials such as battery-grade lithium carbonate, nickel-cobalt metal, and lithium hexafluorophosphate continue to rise, making the value of battery recycling increasingly significant, which is expected to become a new profit growth point in the industry. The cathode material accounts for about 40% of the battery cost, and it contains lithium sources and metals such as nickel and cobalt. Therefore, the recovery and reuse of cathode materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/54Y02E60/10Y02W30/84
Inventor 张云河许开华
Owner JINGMEN GEM NEW MATERIAL