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Method combining waste ternary positive electrode material recovery and electrochemical hydrogen production

A positive electrode material and waste technology, which is applied in the field of joint waste ternary positive electrode material recovery and electrochemical hydrogen production, can solve the problems of strong acid and strong alkali waste liquid, cumbersome recycling steps, and high energy consumption.

Inactive Publication Date: 2021-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the recycling methods of waste lithium-ion battery ternary cathode materials can be mainly divided into fire method and wet method. The fire method is generally accompanied by huge energy consumption and the generation of a large amount of waste gas; For the problem of alkali waste liquid, neither of the two methods can be regarded as an efficient and clean recycling method, and further improvement is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment combines the method of recycling waste ternary positive electrode materials and electrochemical hydrogen production, including the following steps:

[0031] (1) Recycling waste LiNi 0.8 co 0.1 mn 0.1 o 2 Material recovery is carried out by mechanical activation, sieving and drying to obtain waste ternary cathode material recovery powder;

[0032] (2) Mix the waste ternary cathode material recovery powder obtained in step (1) with acetylene black and PTFE at a mass ratio of 85:10:5, disperse them in N-methylpyrrolidone solution, stir them evenly, and dry them, that is Get the pole piece;

[0033] (3) With the pole piece obtained in step (2) as the positive electrode and the graphite electrode as the negative electrode, the 2 SO 4 In the solution, adjust the pH value of the solution to 8, and the temperature of the solution to 50 °C. First, charge at a constant current of 0.01 A to 1.6 V, then charge at a constant voltage at 1.6 V to a current of 0.1...

Embodiment 2

[0037] This embodiment combines the method of recycling waste ternary positive electrode materials and electrochemical hydrogen production, including the following steps:

[0038] (1) Recycling waste LiNi 0.5 co 0.2 mn 0.3 o 2 Material recovery is carried out by mechanical activation, sieving and drying to obtain waste ternary cathode material recovery powder;

[0039] (2) Mix the waste ternary cathode material recovery powder obtained in step (1) with acetylene black and PTFE at a mass ratio of 85:10:5, disperse in N-methylpyrrolidone solution, stir evenly, and apply it on the titanium plate On, drying, that is, to get pole piece;

[0040] (3) The pole piece obtained in step (2) was used as the positive electrode, and the graphite electrode was used as the negative electrode. 2 SO 4 In the solution, adjust the pH of the solution to 8, and the temperature of the solution to 50 °C. First charge at a constant current of 0.01 A to 2.4 V, then charge at a constant voltage at...

Embodiment 3

[0044] This embodiment combines the method of recycling waste ternary positive electrode materials and electrochemical hydrogen production, including the following steps:

[0045] (1) Recycling waste LiNi 0.8 co 0.15 al 0.05 o 2 Material recovery is carried out by mechanical activation, sieving and drying to obtain waste ternary cathode material recovery powder;

[0046] (2) Mix the waste ternary cathode material recovery powder obtained in step (1) with acetylene black and PTFE at a mass ratio of 85:10:5, disperse in N-methylpyrrolidone solution, stir evenly, and apply it on the titanium plate On, drying, that is, to get pole piece;

[0047] (3) The pole piece obtained in step (2) was used as the positive electrode, and the graphite electrode was used as the negative electrode. 2 SO 4 In the solution, adjust the pH of the solution to 8, and the temperature of the solution to 50 °C, first charge at a constant current of 0.01 A to 2.4 V, then charge at a constant voltage ...

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Abstract

The invention relates to a method for combining waste ternary positive electrode material recovery and electrochemical hydrogen production. The method comprises the following steps of (1) recovering a waste ternary positive electrode material and carrying out mechanical activation, sieving and drying on the same to obtain waste ternary positive electrode material recovered powder; (2) mixing the waste ternary positive electrode material recovered powder with a conductive agent and an adhesive, dispersing the same in an N-methyl pyrrolidone solution, and carrying out coating, and drying to obtain a pole piece; (3) taking the pole piece as a positive electrode, taking an inert electrode as a negative electrode, charging the same in an electrolyte solution, generating hydroxide precipitates of nickel and manganese at the positive electrode, and generating hydrogen at the negative electrode; and (4) after the reaction is finished, carrying out solid-liquid separation on a reaction system to obtain a lithium-rich solution, the hydroxide precipitates of the nickel and the manganese and the positive pole piece, and carrying out high-temperature calcination on the positive pole piece to obtain an oxide of cobalt. According to the method, the resource recycling of the waste ternary positive electrode material is realized in a simple, quick, low-energy-consumption and environment-friendly mode.

Description

technical field [0001] The invention relates to the technical field of waste lithium ion battery recovery and electrochemical hydrogen production, and in particular to a method for combining waste and old ternary positive electrode material recovery and electrochemical hydrogen production. Background technique [0002] Since the successful commercialization of lithium-ion batteries in the early 1990s, they have been widely used in mobile electronic devices, electric vehicles, and power grids due to their long service life, high energy density, and wide operating temperature range. In recent years, as countries around the world have gradually escalated their attention to energy and environmental issues, the demand for the development of new energy vehicles, hybrid or electric vehicles has further expanded. According to statistics, in 2019, the output of new energy vehicles in China was 1.242 million, and the number of vehicles in stock exceeded 3.81 million. The market size r...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/02C22B1/00C22B26/12C25B1/02C25B1/01C01G53/00H01M10/54
CPCY02W30/84Y02P10/20
Inventor 贺振江李运姣刘帅威郑俊超
Owner CENT SOUTH UNIV
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