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Method for selectively recycling positive electrode materials for lithium ion batteries

A technology for lithium-ion batteries and cathode materials, which is applied in the field of selective recovery of cathode materials for lithium-ion batteries, and can solve problems such as low recovery rate, limited industrial application value, and cumbersome recycling procedures

Active Publication Date: 2018-11-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned method, the former still has many steps, and the types of metals recovered are less. The recovery process of the latter metals is unstable, and the recovery rate varies greatly.
[0006] Generally speaking, the recycling of cathode materials for lithium-ion batteries has problems such as low selectivity, cumbersome recycling procedures, and secondary pollution.
At the same time, after nickel, cobalt and manganese are separated out in the recovery process, lithium loss is serious, the recovery rate is low, and the concentration of lithium-containing solution is low, which limits its industrial application value. Therefore, it is urgent to develop a short-range, efficient and selective recovery of lithium. Technology of Positive Electrode Waste of Ion Batteries

Method used

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  • Method for selectively recycling positive electrode materials for lithium ion batteries

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Embodiment 1

[0065] This embodiment provides a method for selectively recovering the positive electrode material of a lithium ion battery. The lithium ion battery is a waste lithium cobalt oxide battery, and the metal element composition of the positive electrode material is shown in Table 1.

[0066] Table 1 Composition of metal elements in cathode materials of waste lithium cobaltate batteries

[0067] Metal

Li

Al

Ni

co

mn

Content, wt%

6.81

0.52

0.03

59.23

0.01

[0068] The method comprises the steps of:

[0069] (1) After mixing the positive electrode material of lithium cobalt oxide battery with sulfuric acid at a molar ratio of 2:1, dry it at 150°C for 8 hours, and then bake it at 800°C for 2 hours. Carried out under vacuum conditions;

[0070] (2) leaching the roasted product obtained in step (1) with water, the solid-to-liquid ratio of the roasted product and water is 400g L -1 , leached at 20°C for 400 minutes, filtered and ...

Embodiment 2

[0074] This embodiment provides a method for selectively reclaiming the positive electrode material of a lithium-ion battery, and the lithium-ion battery is a waste nickel-cobalt lithium manganate battery (LiNi 0.5 co 0.2 mn 0.3 o 2 ), the metal element composition of its cathode material is shown in Table 2.

[0075] Table 2 Composition of metal elements in the positive electrode material of waste nickel-cobalt lithium manganese oxide battery

[0076] Metal

Li

Al

Ni

co

mn

Content, wt%

6.69

0.20

28.64

12.10

16.45

[0077] The method comprises the steps of:

[0078] (1) After mixing the positive electrode material of nickel-cobalt lithium manganese oxide battery, sulfuric acid and sodium sulfate in a molar ratio of 2:2:1, dry at 100°C for 12h, and then bake in air atmosphere at 500°C for 6h;

[0079] (2) leaching the roasted product obtained in step (1) with water, the solid-to-liquid ratio of the roasted product and w...

Embodiment 3

[0083] This embodiment provides a method for selectively reclaiming the positive electrode material of a lithium-ion battery, and the lithium-ion battery is a waste nickel-cobalt lithium manganate battery (LiNi 0.3 co 0.3 mn 0.3 o 2 ), the metal element composition of its cathode material is shown in Table 3.

[0084] Table 3 Composition of metal elements in the positive electrode material of waste nickel-cobalt lithium manganese oxide battery

[0085] Metal

Li

Al

Ni

co

mn

Content, wt%

6.71

0.19

20.64

20.10

18.45

[0086] The method comprises the steps of:

[0087] (1) After mixing the positive electrode material of nickel-cobalt lithium manganese oxide battery with sulfuric acid at a molar ratio of 5:1, dry it at 300°C for 0.2h, and then bake it at 1500°C for 0.5h in an argon atmosphere;

[0088] (2) leaching the roasted product obtained in step (1) with water, the solid-to-liquid ratio of the roasted product and wat...

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Abstract

The invention provides a method for selectively recycling positive electrode materials for lithium ion batteries. The method comprises the following steps: carrying out transformation processing aftermixing the recycling positive electrode materials for lithium ion batteries with an additive; leaching an obtained transformation product with a leaching agent, and carrying out solid-liquid separation to obtain a lithium-rich solution and a solid slag; and preparing the obtained lithium-rich solution into a lithium salt and the obtained solid slag into a transition metal salt. According to the method, recycling of valuable metals in the positive electrode materials for lithium ion batteries is realized by using in situ crystal transformation and mild leaching methods, particularly, selectiveextraction for lithium is realized, the recycle rate reaches 95% or above, and the recycle rate of other valuable metals such as nickel, cobalt and manganese reaches 98% or above; the method is shortin flow, other impurity ions are not introduced, the product purity is high, secondary pollution and liquid waste disposal can also be avoided, the recycle cost is saved, and the method is easy to realize industrial application.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and relates to a method for selectively recovering positive electrode materials of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a rechargeable battery that does not contain cadmium, lead, mercury and other elements that pollute the environment. Due to its outstanding performance and environmental advantages, lithium-ion batteries have become an ideal choice for portable energy applications. In technology and market The share has experienced leapfrog development. In recent years, lithium-ion batteries have gradually replaced nickel-metal hydride batteries and are used to power electric vehicles. Related research has matured. With the expansion of the electric vehicle market, the consumption of lithium-ion batteries will increase sharply, and the service life of lithium-ion batteries has reached the end After the deadline, its subsequent rea...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B7/00C22B26/12C22B23/00
CPCC22B7/007C22B23/043C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 孙峙林娇刘春伟曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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