Method for recycling graphite and copper foil from scrapped lithium ion battery negative pole piece
A lithium-ion battery and negative electrode technology, which is applied in the field of recycling of scrap lithium-ion batteries, can solve the problems of high recycling cost, high solution viscosity, and high requirements for equipment anti-corrosion, so as to achieve no secondary pollution, low requirements, easy-to-use effects
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Embodiment 1
[0012] Example 1: Prepare a mixed solution at a ratio of 5:1 according to the volume ratio of the volume of water to ethanol (ml / ml), and then set the volume ratio (g / ml) of 1:20 according to the mass of the negative electrode sheet to the mixed solution Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 100r / min for 5min, and the temperature of the water during the stirring process is 20°C. After stopping the stirring, sieve the contents in the container with a sieve with a pore size of 6 mm, wash the sieve with water once, and dry naturally to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite.
Embodiment 2
[0013] Example 2: Prepare a mixed solution according to the ratio of 10:1 according to the volume ratio of the volume of water to ethanol (ml / ml), and then according to the mass of the negative plate and the volume ratio (g / ml) of the mixed solution is 1:20 Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 100r / min for 8min, and the temperature of the water during the stirring process is 20°C. After stopping the stirring, sieve the contents in the container with a sieve with a pore size of 6 mm, wash the sieve with water once, and dry naturally to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite.
Embodiment 3
[0014] Example 3: Prepare a mixed solution at a ratio of 10:1 according to the volume ratio of water to ethanol (ml / ml), and then prepare a mixed solution according to the mass of the negative plate and the volume ratio (g / ml) of the mixed solution to 1:40 Put the negative electrode sheet into a container containing the mixed solution and stir it with an electric stirrer at a stirring speed of 150r / min for 5min, and the temperature of the water during the stirring process is 20°C. After the stirring is stopped, the material in the container is sieved with a sieve with a hole diameter of 8mm, and the sieve is washed once with water, and then naturally dried to obtain copper foil. After heating the undersize to 80°C, carry out suction filtration. During the suction filtration, keep the temperature of the mixed liquid before filtration at 80°C. After the suction filtration, wash the filter with water once, and dry naturally to obtain graphite. The separation rate of graphite and ...
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