Method for leaching metals in anode material of waste lithium ion battery

A lithium-ion battery and positive electrode material technology, which is applied in the field of comprehensive recycling of waste lithium-ion batteries, can solve problems such as low alloy purity, low metal leaching rate, and high impurity content, and achieve high metal selectivity, high metal leaching rate, and The effect of low impurity content

Inactive Publication Date: 2018-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above existing technologies, the pyrotechnic process equipment requires high requirements, and the purity of the alloy is low. The subsequent hydrometallurgical process still needs a series of purification and impurity removal steps
The selectivity of acid leaching to metals in the wet process is low, resulting in high impurity content in the leaching solution, the subsequent impurity removal process is cumbersome, and the acid gas and wastewater generated are difficult to treat; the microbial culture used in bioleaching is complicated, and the leaching treatment cycle is long. Al

Method used

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  • Method for leaching metals in anode material of waste lithium ion battery
  • Method for leaching metals in anode material of waste lithium ion battery
  • Method for leaching metals in anode material of waste lithium ion battery

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Embodiment 1

[0043] This embodiment provides a method for leaching the metal in the positive electrode material of the waste lithium-ion battery, and its process flow chart is as follows figure 1 shown, including the following steps:

[0044] 1) Discharge the waste lithium-ion battery by immersing it in a sodium chloride solution with a concentration of 15g / L for 36 hours. After the discharge, disassemble it manually to obtain the positive electrode material, shell, negative electrode material, diaphragm, and terminal;

[0045]2) Put the positive electrode material obtained in step 1) into a muffle furnace and bake at 350° C. for 2 hours;

[0046] 3) The product obtained in step 2) is crushed with a high-speed universal pulverizer, and then sieved with an 80-mesh sieve to obtain the crude positive active material and aluminum foil;

[0047] 4) Put the crude positive active material obtained in step 3) into a muffle furnace for calcination at a high temperature of 650° C. for 2 hours to ob...

Embodiment 2

[0055] This embodiment provides a method for leaching the metal in the positive electrode material of the waste lithium-ion battery, comprising the following steps:

[0056] 1) Soak the waste lithium-ion battery in a sodium chloride solution with a concentration of 15g / L for 36 hours, discharge it, and disassemble it manually after the discharge to obtain the positive electrode material;

[0057] 2) Put the positive electrode material obtained in step 1) into a muffle furnace and bake at 350° C. for 2 hours;

[0058] 3) The product obtained in step 2) is crushed with a high-speed universal pulverizer, and then sieved with an 80-mesh sieve to obtain the crude positive active material and aluminum foil;

[0059] 4) putting the crude positive active material obtained in step 3) into a muffle furnace for calcination at a high temperature of 650° C. for 2 hours to obtain the positive active material;

[0060] 5) Weigh 80g of the positive electrode active material obtained in step ...

Embodiment 3

[0066] Be 600mL concentration in the present embodiment and be the ammonium sulfate solution of 5mol / L, all the other are identical with embodiment 1. The leaching rates of various metals in the final leach solution were detected and calculated, and the results showed that the leaching rates of Ni, Co, Mn and Li were 86.64%, 65.31%, 85.02% and 91.01%, respectively.

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Abstract

The invention relates to a method for leaching metals in an anode material of a waste lithium ion battery. The method for leaching the metals in the anode material of the waste lithium ion battery comprises the steps that anode active substances are obtained after the waste lithium ion battery is pretreated, then the anode active substances are made to react with an ammonium salt solution containing a reducing agent, solid-liquid separation is conducted after the reaction, and thus, leachate and filter residues are obtained. According to the method, the process is simple, the metal leaching rate is high, and the metal selectivity is high; by controlling the type and quantity of the reducing agent used in the leaching process, selective leaching of the metals can be achieved, for instance,when the anode material contains metals such as Li, Co and Mn, the reducing agent is ammonium sulfite, the leaching rate of Mn is 90% when the concentration of the reducing agent is 0.75 mol/L, and the leaching rate of Mn is 4% when the concentration of the reducing agent is 1.5 mol/L; the impurity content of the leachate is low, so that the cost for the subsequent impurity removal procedure is low; and the leaching process is conducted in a high-pressure kettle, emission of poisonous gas is avoided in the operation process, and the operation environment is good.

Description

technical field [0001] The invention relates to the field of comprehensive recovery and utilization of waste lithium ion batteries, and more specifically, relates to a method for leaching metals in positive electrode materials of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in mobile electronic devices, power vehicles, energy storage and other fields due to their excellent characteristics such as high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect. According to statistics, the output of lithium-ion batteries in China reached 5.6 billion in 2015. However, the service life of lithium batteries is generally 3-6 years, and the number of waste lithium-ion batteries due to end of life or other reasons is increasing. The cathode materials currently used in commercial lithium-ion batteries are binary or ternary materials composed of lithium cobalt oxide, lithium iron phosphate, l...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B47/00H01M10/54
CPCC22B7/006C22B26/12C22B47/00H01M10/54Y02P10/20Y02W30/84
Inventor 陈永明刘南南胡芳介亚菲席炎杨声海何静
Owner CENT SOUTH UNIV
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