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Method for reducing alkali consumption in aluminum removal of battery positive electrode waste

A technology for battery positive electrode and positive electrode material, which is applied in the field of reducing alkali consumption and removing aluminum from battery positive electrode waste, can solve the problems affecting the electrochemical stability of the product, rate performance, low aluminum removal efficiency, and aluminum performance influence, etc., and achieve fast and efficient. Aluminium removal, avoid influence, improve the effect of aluminum removal kinetic energy

Pending Publication Date: 2022-01-28
CENT SOUTH UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, the incorporation of aluminum will have a great impact on the performance of subsequent recycled products, such as affecting the electrochemical stability of the product, rate performance, etc.
[0005] Therefore, many researchers try to remove aluminum impurities in advance before wet extraction of valuable metals. Due to the two-sidedness of Al metal, the most common method is to use sodium hydroxide alkali leaching to remove aluminum. Aluminum is not efficient and other issues

Method used

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  • Method for reducing alkali consumption in aluminum removal of battery positive electrode waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the liquid-solid ratio of 6:1, 100g of lithium iron phosphate positive electrode waste (particle size is 31 μm, aluminum content is 3.4%) and 1.5wt% NaOH solution are placed in the stirring mill, the reaction time is 2h, and the stirring mill speed is 1500r / min, during which 1g of ascorbic acid was added every 20min, a total of 3g, after the reaction, the ore slurry was filtered to obtain filter residue and filtrate; the filter residue was subjected to the second grinding and leaching, and 5wt% NaOH solution was added according to the liquid-solid ratio of 4:1, and the reaction time was 1h. The rotational speed of the mill was 2000r / min, during which 0.5g of ascorbic acid was added every 30min, and the aluminum leaching rate was 96%.

Embodiment 2

[0028] Compared with Example 1, the ascorbic acid is changed to use tea polyphenols.

[0029] According to the liquid-solid ratio of 6:1, 100g of lithium iron phosphate positive electrode waste (particle size is 31 μm, aluminum content is 3.4%) and 1.5wt% NaOH solution are placed in the stirring mill, the reaction time is 2h, and the stirring mill speed is 1500r / Min, during which 1g of tea polyphenols was added every 20min, 3g in total, after the reaction, the slurry was filtered to obtain the filter residue and filtrate; the filter residue was subjected to the second grinding and leaching, and 5wt% NaOH solution was added according to the liquid-solid ratio of 4:1, and the reaction time was 1h , the rotating speed of the mixing mill is 2000r / min, during which 0.5g ascorbic acid is added every 30min, and the aluminum dipping rate is 95%.

Embodiment 3

[0031] Compared with Example 1, the NaOH concentration of the first aluminum immersion was reduced to 1 wt%.

[0032] According to the liquid-solid ratio of 6:1, 100g of lithium iron phosphate positive electrode waste (particle size is 31 μm, aluminum content is 3.4%) and 1wt% NaOH solution are placed in the stirring mill, the reaction time is 2h, and the stirring mill speed is 1500r / min , add 1g of ascorbic acid every 20min during this period, 3g in total, after the reaction, the ore slurry is filtered to obtain filter residue and filtrate; the filter residue is subjected to grinding and leaching for the second time, and 5wt% NaOH solution is added according to the liquid-solid ratio of 4:1, and the reaction time is 1h. The rotating speed of the machine is 2000r / min, during which 0.5g ascorbic acid is added every 30min, and the aluminum dipping rate is 94%.

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Abstract

The invention belongs to the technical field of waste battery positive electrode material recovery treatment, and particularly discloses a method for reducing alkali consumption in battery positive electrode waste aluminum removal. On the basis of ore grinding leaching, two-stage countercurrent leaching is adopted, so effective utilization of sodium hydroxide alkali liquor is ensured to the greatest extent while efficient leaching of aluminum is ensured, and the consumption of alkali liquor is obviously reduced; meanwhile, when the mill is used for leaching, the rotating speed of the mill is reasonably reduced, so that the energy consumption is reduced to a certain extent.

Description

technical field [0001] The invention relates to the recycling of waste lithium ion batteries, in particular to a method for reducing alkali consumption in removing aluminum from battery positive electrode waste. [0002] technical background [0003] Lithium-ion batteries are widely used in the fields of electronic products, aerospace and power vehicles due to their advantages such as high safety, no memory effect, and high specific energy. Especially with the promotion and application of electric vehicles, the use of lithium-ion batteries has entered a new level. However, with the increasing usage of lithium-ion batteries, the efficient and safe recycling of lithium-ion batteries has become an urgent problem to be solved. [0004] Lithium-ion batteries mainly include five parts: positive electrode material, negative electrode material, diaphragm, electrolyte, and shell. After the binder is mixed, it is coated on aluminum foil and pressed into tablets. A certain amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B3/12H01M10/0525
CPCH01M10/54C22B3/12H01M10/0525Y02E60/10Y02P10/20Y02W30/84
Inventor 杨越宋绍乐孙淼淼孙伟唐鸿鹄
Owner CENT SOUTH UNIV
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