Recovery method of waste lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, which is applied in the field of high-value resource utilization of waste lithium-ion battery negative electrode materials, can solve the problems of few researches on the recovery and treatment of negative electrode active materials, single recycling target, complex recycling schemes, etc., and achieve resource utilization The effects of simplification, process simplification, safety, environmental protection and low cost

Active Publication Date: 2020-07-17
湖南烯富环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the recycling of waste batteries mainly focuses on the recovery of positive metal and negative electrode copper materials, and there is little research on the recovery and processing of negative electrode active materials. A high-value recycling solution with short process, low cost and simultaneous recycling of multiple valuable substances is of great significance to the sustainable development of the battery recycling industry and resources

Method used

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  • Recovery method of waste lithium ion battery negative electrode material
  • Recovery method of waste lithium ion battery negative electrode material
  • Recovery method of waste lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]Take the waste lithium-ion battery, soak it in sodium chloride salt solution and discharge completely (short-circuit discharge until the residual voltage is 0V), then disassemble the negative electrode sheet, crush the negative electrode sheet, stir in water, separate, and dry to obtain the waste lithium-ion battery negative electrode powder;

[0050] Take 10g of waste lithium-ion battery negative electrode powder, mix it with sodium chloride evenly, and the mass ratio of sodium chloride to negative electrode powder is 0.5:1;

[0051] The homogeneously mixed materials were heated up to the melting point of sodium chloride at a heating rate of 5°C / min under an argon atmosphere, and the holding time was 1h. After the heat treatment, the temperature was naturally lowered.

[0052] The heat-treated material was placed in deionized water at a solid-to-liquid ratio of 1:20, stirred at room temperature for 1 h, filtered and separated to obtain a lithium-containing filtrate and a...

Embodiment 2

[0055] Take the waste lithium-ion battery, disassemble it under the condition of pouring water (not fully discharged, residual voltage > 0V) to obtain the negative pole piece, crush the negative pole piece, stir in water, separate, and dry to obtain the waste lithium-ion battery negative pole powder (that is, not fully discharged negative electrode powder);

[0056] Take 10g of waste lithium-ion battery negative electrode powder, mix it with potassium chloride, and the mass ratio of potassium chloride to negative electrode powder is 0.5:1;

[0057] The homogeneously mixed materials were heated up to 800°C at a heating rate of 5°C / min under an argon atmosphere, and the holding time was 1h. After the heat treatment, the temperature was naturally lowered.

[0058] The heat-treated material was placed in deionized water at a solid-to-liquid ratio of 1:20, stirred at 40° C. for 1 h, filtered and separated to obtain a lithium-containing filtrate and a purified negative electrode mat...

Embodiment 3

[0061] Negative electrode powder is with embodiment 2;

[0062] Get 10g waste lithium ion battery negative electrode powder, mix with metal chloride, the mass ratio of metal chloride and negative electrode powder is 0.5:1, and wherein metal chloride is the mixture of sodium chloride and calcium chloride, both ratios are 1: 1;

[0063] The homogeneously mixed materials were heated up to 800°C at a heating rate of 5°C / min under an argon atmosphere, and the holding time was 1h. After the heat treatment, the temperature was naturally lowered.

[0064] The heat-treated material was placed in deionized water at a solid-to-liquid ratio of 1:20, stirred at 60° C. for 1 h, filtered and separated to obtain a lithium-containing filtrate and a purified negative electrode material.

[0065] After testing, the leaching rate of lithium ions in the process of extracting lithium by water leaching reaches 90%, and 1kg of spent negative electrode powder can be recovered to obtain about 25g of l...

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Abstract

The invention discloses a recovery method of a waste lithium ion battery negative electrode material. The method comprises the following basic steps of 1) mixing the waste lithium ion battery negativeelectrode powder with molten salt; 2) carrying out heat treatment on the mixed powder at a temperature not lower than the melting point of molten salt; and 3) soaking the material subjected to heat treatment in water, uniformly stirring, carrying out solid-liquid separation, recovering lithium and other valuable metals by using the liquid phase, and drying the solid phase to obtain the regenerated negative electrode material. According to the invention, the purification and structure repair of the negative electrode material in the waste lithium ion battery negative electrode material and therecovery of valuable metals are realized. The method has the advantages of short treatment flow and low cost, and the obtained regenerated negative electrode material is high in purity, good in crystallinity and high in valuable metal leaching rate and is suitable for the large-scale production.

Description

technical field [0001] The invention belongs to the field of waste battery recycling, in particular to a method for high-value resource utilization of waste lithium ion battery anode materials. Background technique [0002] Lithium-ion batteries are widely used in various electronic fields due to their superior electrochemical performance. According to the data from the National Bureau of Statistics, the output of lithium-ion batteries in my country was about 1.8 billion in 2013. It is estimated that by 2020, the total production of lithium-ion batteries in China will exceed 25 billion. Lithium-ion battery life is generally 2-3 years, when the battery capacity drops below 80%, it is not suitable for continued use. The increase in the amount of lithium-ion batteries has also brought a large number of waste batteries. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, organic electrolytes and separators. Due to the large amount of precious ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B32/215C22B7/00C22B26/12
CPCH01M10/54C22B7/006C22B26/12C01B32/215H01M2004/027Y02E60/10Y02W30/84Y02P10/20
Inventor 周昶猷唐晶晶周向阳杨娟周昊宸刘晓剑马亚赟王鹏周进辉王辉周向清
Owner 湖南烯富环保科技有限公司
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