Recycling method of lithium ion battery positive electrode material fine powder

Abstract

The invention belongs to the field of powder recovery, and relates to a recovery method of lithium ion battery positive electrode material fine powder. The method comprises: carrying out ball milling on lithium ion battery positive electrode material fine powder, polyurethane and a grinding aid until the particle size D50 is less than or equal to 1.0 [mu]m; uniformly mixing the obtained fine powder with a dispersing agent, a cosolvent and water; separating the obtained mixed slurry into a large-particle-size positive electrode material, a small-particle-size positive electrode material and a suspension containing a plurality of elements; washing and drying a large-granularity positive electrode material, testing the ICP content, supplementing lithium salt and a coating additive according to a test value, and carrying out coating sintering in an oxygen atmosphere; washing and drying a small-particle-size positive electrode material, testing the ICP content, supplementing lithium salt and a doping additive according to a test value, and carrying out high-temperature sintering in an oxygen atmosphere; and drying and screening the turbid liquid. When the method provided by the invention is used for recovering the fine powder of the positive electrode material of the lithium ion battery, the gram volume and the cycling stability of the regenerated positive electrode material are very good.

Description

technical field

[0001] The invention belongs to the field of lithium ion cathode material powder recovery, and in particular relates to a recovery method for lithium ion battery cathode material fine powder. Background technique

[0002] With the vigorous development of the new energy industry, the positive electrode material is one of the most important main materials of lithium-ion batteries, and its performance has also become one of the main factors determining the quality of the battery cell. Therefore, the related positive electrode material industry has ushered in recent years. rapid development period. The production process of cathode materials is constantly improving, and the demand for market capacity is constantly increasing. While material production enterprises are increasing production capacity, the amount of waste gas and waste in the process is also increasing, and crushed fine powder is one of them. Enterprises that produce positive electrode materials ba...

Examples

Embodiment 1

[0042] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, and the crystal form is single crystal) and grinding aid (magnesium oxide), polyurethane grinding balls are added in the ball milling tank according to the weight ratio of 1:0.02:1, with the ball milling frequency of 35Hz , ball milled for 2 hours to get fully dispersed fine powder, the particle size D 50 ≤1.0μm. Among them, the SEM image of NCM622 cathode material is as follows figure 1 shown. from figure 1 It can be seen that the particle size of the positive electrode material in the fine powder is 0.01 μm to 5 μm.

[0043] (2) Add the above-mentioned fine powder and HPMA (the number average molecular weight is 758, the pH value of 1% aqueous solution is 2.3), NaOH and deionized water are added in the reactor and stirred for 2h, the addition of HPMA is 0.1wt%, the addition of NaOH The addition amount is 4mol / L, the ratio of fine powder...

Embodiment 2

[0049] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, the crystal form is single crystal, the particle size is 0.01μm~5μm) and grinding aid (ethylene glycol), polyurethane grinding balls are added to the ball mill at a weight ratio of 1:0.04:1 In the tank, mill at a ball milling frequency of 35 Hz for 2 hours to obtain a fully dispersed fine powder with a particle size of D 50 ≤1.0μm.

[0050] (2) Add above-mentioned fine powder material and HPMA, NaOH and deionized water in the reactor and stir for 2h, wherein, the addition amount of HPMA is 0.15%, the addition amount of NaOH is 4mol / L, the ratio of fine powder material and water is 0.3:1, to obtain a mixed slurry where solid and liquid coexist.

[0051] (3) Pass the mixed slurry into a decanter centrifuge, set the speed of the centrifuge at 15000r / min, and separate the large-grained positive electrode material (3.4-3.7μm) and small-grained T...

Embodiment 3

[0056] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, the crystal form is single crystal, the particle size is 0.01 μm ~ 5 μm) and grinding aid (talc powder), polyurethane grinding balls are added to the ball milling tank according to the weight ratio of 1:0.05:1 In the process, ball milling at a ball milling frequency of 35 Hz for 2 hours yields fully dispersed fine powder with a particle size of D 50 ≤1.0μm.

[0057] (2) Add above-mentioned fine powder material and HPMA, NaOH and deionized water in the reactor and stir for 2h, wherein, the addition amount of HPMA is 0.15%, the addition amount of NaOH is 4mol / L, the ratio of fine powder material and water is 0.3:1, to obtain a mixed slurry where solid and liquid coexist.

[0058] (3) Pass the mixed slurry into a decanter centrifuge, set the speed of the centrifuge at 17000r / min, and separate the large-grained positive electrode material (3.3-3...

technical field

[0001] The invention belongs to the field of lithium ion cathode material powder recovery, and in particular relates to a recovery method for lithium ion battery cathode material fine powder. Background technique

[0002] With the vigorous development of the new energy industry, the positive electrode material is one of the most important main materials of lithium-ion batteries, and its performance has also become one of the main factors determining the quality of the battery cell. Therefore, the related positive electrode material industry has ushered in recent years. rapid development period. The production process of cathode materials is constantly improving, and the demand for market capacity is constantly increasing. While material production enterprises are increasing production capacity, the amount of waste gas and waste in the process is also increasing, and crushed fine powder is one of them. Enterprises that produce positive electrode materials ba...

Examples

Embodiment 1

[0042] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, and the crystal form is single crystal) and grinding aid (magnesium oxide), polyurethane grinding balls are added in the ball milling tank according to the weight ratio of 1:0.02:1, with the ball milling frequency of 35Hz , ball milled for 2 hours to get fully dispersed fine powder, the particle size D 50 ≤1.0μm. Among them, the SEM image of NCM622 cathode material is as follows figure 1 shown. from figure 1 It can be seen that the particle size of the positive electrode material in the fine powder is 0.01 μm to 5 μm.

[0043] (2) Add the above-mentioned fine powder and HPMA (the number average molecular weight is 758, the pH value of 1% aqueous solution is 2.3), NaOH and deionized water are added in the reactor and stirred for 2h, the addition of HPMA is 0.1wt%, the addition of NaOH The addition amount is 4mol / L, the ratio of fine powder...

Embodiment 2

[0049] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, the crystal form is single crystal, the particle size is 0.01μm~5μm) and grinding aid (ethylene glycol), polyurethane grinding balls are added to the ball mill at a weight ratio of 1:0.04:1 In the tank, mill at a ball milling frequency of 35 Hz for 2 hours to obtain a fully dispersed fine powder with a particle size of D 50 ≤1.0μm.

[0050] (2) Add above-mentioned fine powder material and HPMA, NaOH and deionized water in the reactor and stir for 2h, wherein, the addition amount of HPMA is 0.15%, the addition amount of NaOH is 4mol / L, the ratio of fine powder material and water is 0.3:1, to obtain a mixed slurry where solid and liquid coexist.

[0051] (3) Pass the mixed slurry into a decanter centrifuge, set the speed of the centrifuge at 15000r / min, and separate the large-grained positive electrode material (3.4-3.7μm) and small-grained T...

Embodiment 3

[0056] (1) Process fine powder of NCM622 cathode material (active ingredient is LiNi x co y mn z o 2 , x is 0.6, y is 0.2, z is 0.2, the crystal form is single crystal, the particle size is 0.01 μm ~ 5 μm) and grinding aid (talc powder), polyurethane grinding balls are added to the ball milling tank according to the weight ratio of 1:0.05:1 In the process, ball milling at a ball milling frequency of 35 Hz for 2 hours yields fully dispersed fine powder with a particle size of D 50 ≤1.0μm.

[0057] (2) Add above-mentioned fine powder material and HPMA, NaOH and deionized water in the reactor and stir for 2h, wherein, the addition amount of HPMA is 0.15%, the addition amount of NaOH is 4mol / L, the ratio of fine powder material and water is 0.3:1, to obtain a mixed slurry where solid and liquid coexist.

[0058] (3) Pass the mixed slurry into a decanter centrifuge, set the speed of the centrifuge at 17000r / min, and separate the large-grained positive electrode material (3.3-3...

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