Method for synthesizing zinc-doped ternary material precursor from waste lithium battery through recovery

A technology for waste lithium batteries and ternary materials, applied in the field of ternary material precursors, can solve the problem of inability to remove impurity metals, and achieve the effect of increasing added value and reducing process flow

Active Publication Date: 2018-06-01

TIANQI LITHIUM CORP

9 Cites 6 Cited by

AI-Extracted Technical Summary

Problems solved by technology

This method uses a high-temperature roasting method to recover the positive electrode material, which cannot remove impurity...

Abstract

A waste lithium battery contains Zn, and after a ternary precursor is doped with Zn, interface stability of an electrode/electrolyte and the structural stability at high voltage can be improved, increase of charge transfer resistance during the cycle is inhibited, and Li<+> diffusion is facilitated. Therefore, the invention discloses a method for synthesizing a zinc-doped ternary material precursor from the waste lithium battery through recovery. The method comprises the following steps: removing doping elements except Zn from an acid leaching solution of a waste lithium battery cell crushingmaterial, adjusting the content of Ni, Co and Mn, synthesizing a doping material with a coprecipitation method, and performing precipitation, washing and drying to obtain the single zinc-doped ternarymaterial precursor. The single zinc-doped ternary material precursor is obtained while the ternary precursor is synthesized from the waste lithium battery through recovery; the method has the advantages of being simple in process flow, good in doping effect, cost-saving and capable of significantly improving electrochemical performance of the precursor and the like.

Application Domain

Waste accumulators reclaimingBattery recycling

Technology Topic

Structural stabilityCoprecipitation +8

Image

Examples

Experimental program(3)

Example Embodiment

[0042] Example 1

[0043] A method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries, comprising the following steps:

[0044] 1. The composition of the acid leaching solution of the cathode material of the waste lithium battery is shown in Table 1. Adjust the pH to 4 with 5% NaOH solution, add iron powder with 3 times of Cu content, stir at 150rpm for 0.5h, and then add 1.2% of the iron powder. The other doping elements can be removed after stirring and reacting at the same rate for 0.5-1 h.

[0045] Table 1 (unit: g/L)

[0046] Mn

[0047] 2. The composition of the acid leaching solution after removing other doping elements is shown in Table 2. Take 200mL of acid leaching solution after impurity removal, add 8.15g NiSO 4.6H 2 O and 5.58g MnSO 4.H 2 O, prepared into a solution with a molar ratio of Ni, Co, and Mn of 1:1:1.

[0048] Table 2 (unit: g/L)

[0049] Mn

[0050] 3. Adjust the acid leaching solution of Ni, Co, Mn molar ratio in step 2 at 40 ° C, under the condition of stirring speed 400rpm, with the complexing agent of concentration 0.5mol/L, the precipitating agent of 3mol/L under nitrogen atmosphere with The reaction was carried out at pH 10.9.

[0051] 4. The obtained precipitate is washed and dried at 100° C. to obtain a Zn-doped ternary precursor.

[0052] The undoped ternary material precursor and the Zn-doped ternary material precursor in this example were mixed with Li respectively. 2 CO 3 It was sintered into a positive electrode material, and the electrochemical properties were tested. The relevant data are shown in Table 3.

[0053] table 3

[0054]

Example Embodiment

[0055] Example 2

[0056] A method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries, comprising the following steps:

[0057] 1. The composition of the acid leaching solution of the cathode material of the waste lithium battery is shown in Table 4. Adjust the pH to 4 with 5% NaOH solution, add iron powder with 3 times of Cu content, stir at 150rpm for 0.5h, and then add 1.2% of the iron powder. The other doping elements can be removed after stirring and reacting at the same rate for 0.5 h.

[0058] Table 4 (unit: g/L)

[0059] Mn

[0060] 2. The composition of the acid leaching solution after removing other doping elements is shown in Table 5. Take 200mL of acid leaching solution after impurity removal, add 36.14g NiSO 4.6H 2 O and 11.58g MnSO 4.H 2 O, prepared into a solution with a molar ratio of Ni, Co, and Mn of 5:2:3.

[0061] Table 5 (unit: g/L)

[0062] Mn

[0063] 3. Adjust the acid leaching solution of Ni, Co, Mn molar ratio in step 2 at 50 ° C, under the condition of stirring speed 500rpm, with the complexing agent of concentration 0.6mol/L, the precipitating agent of 4mol/L under nitrogen atmosphere with The reaction was carried out at pH 11.0.

[0064] 4. The obtained precipitate is washed and dried at 100° C. to obtain a Zn-doped ternary precursor.

[0065] The undoped ternary material precursor and the Zn-doped ternary material precursor in this example were mixed with Li respectively. 2 CO 3 It was sintered into a cathode material, and the electrochemical properties were tested. The relevant data are shown in Table 6.

[0066] Table 6

[0067]

Example Embodiment

[0068] Example 3

[0069] A method for recycling and synthesizing zinc-doped ternary material precursors from waste lithium batteries, comprising the following steps:

[0070] 1. The composition of the acid leaching solution of the cathode material of the waste lithium battery is shown in Table 7. Adjust the pH to 5 with 5% NaOH solution, add iron powder with 4 times of Cu content, stir at 150rpm for 0.5h, and then add 1.4% of the iron powder. The other doping elements can be removed by stirring the reaction at the same rate.

[0071] Table 7 (unit: g/L)

[0072] Mn

[0073] 2. The composition of the acid leaching solution after removing other doping elements is shown in Table 8. Take 200mL of acid leaching solution after impurity removal, add 8.41g NiSO 4.6H 2 O, 6.08g MnSO 4.H 2 O and 0.1 g ZnSO 4 , prepared into a solution with a molar ratio of Ni, Co, and Mn of 1:1:1.

[0074] Table 8 (unit: g/L)

[0075]

[0076] 3. Adjust the acid leaching solution of Ni, Co, Mn molar ratio in step 2 at 60 ° C, under the condition of stirring speed 400rpm, with the complexing agent of concentration 0.6mol/L, the precipitating agent of 4mol/L under nitrogen atmosphere with The reaction was carried out at pH 11.1.

[0077] 4. The obtained precipitate is washed and dried at 100° C. to obtain a Zn-doped ternary precursor.

[0078] The undoped ternary material precursor and the Zn-doped ternary material precursor in this example were mixed with Li respectively. 2 CO 3 It was sintered into a positive electrode material, and the electrochemical properties were tested. The relevant data are shown in Table 9.

[0079] Table 9

[0080]

[0081] According to the test results of the above examples, the method of the present invention effectively removes other doping elements in the process of recycling waste lithium batteries, and obtains a single Zn-doped ternary material precursor, which is sintered into The positive electrode material significantly improves the electrochemical performance, increases the added value of recycled products, combines recycling and modified production, reduces the subsequent process flow, and saves costs.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

short process
Increase added value

Method for preparing and recovering ternary anode material from waste nickel-cobalt-manganese ternary lithium ion batteries

ActiveCN106848470Aavoid separationshort process

Owner:CENT SOUTH UNIV

Method for synthesizing zinc-doped ternary material precursor from waste lithium battery through recovery

A technology for waste lithium batteries and ternary materials, applied in the field of ternary material precursors, can solve the problem of inability to remove impurity metals, and achieve the effect of increasing added value and reducing process flow

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Method for preparing flame retardant magnesium hydroxide

Plastic bag production technology

Method for separating and recovering sodium arsenate and alkali by fractional crystallization method

Comprehensive recycling treatment method of waste rare-earth fluorescent lamp

Cold continuous rolling method of brass wires

Classification and recommendation of technical efficacy words

Method for preparing and recovering ternary anode material from waste nickel-cobalt-manganese ternary lithium ion batteries

Method for recovering lead oxide from waste containing lead oxide

Process for extracting vanadium by acid leaching of stone coal

Method for separating and recovering rare and precious metals in chlorination leaching liquid

Method for producing polyester industrial yarn by one-step method

Production method of plant straw partical board containing absorption purifying agent

Preparation of crust oligosaccharide and use

Method for producing low-melting-point renewable polyester for sheath-core polyester through glycol degradation

Bast fiber fabric with protective function and preparation method thereof

Method for preparing almond peptide from almond dregs