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Method for recovering waste lithium titanate negative electrode sheet

A recovery method, lithium titanate technology, applied in the field of recovery of waste lithium titanate negative electrode, can solve the problems of difficult industrialization, high process requirements, large fluctuations in leaching rate, etc., to achieve the reduction of impurity metals, high purity, good The effect of production efficiency

Inactive Publication Date: 2018-06-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching of the peroxide complexation method adopted in this patent under alkaline conditions has high requirements on the process, and the leaching rate fluctuates greatly. At the same time, it also has a great impact on the subsequent treatment of titanium and lithium separation, and it is difficult to realize industrialization.

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  • Method for recovering waste lithium titanate negative electrode sheet

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Effect test

Embodiment 1

[0028] figure 1 For the flow chart of the recovery method of the waste and old lithium titanate negative plate that the present invention proposes; Refer to figure 1 , a kind of recovery method of waste lithium titanate negative plate that the present invention proposes, comprises the following steps:

[0029] S1. Calcination: Take the waste lithium titanate negative electrode sheet (including electrolyte) directly disassembled from the scrapped liquid-injected battery, put it into a tube furnace under nitrogen protection, and calcinate it at 350°C for 4 hours to obtain titanic acid Lithium negative electrode and tail gas, the tail gas is condensed and liquefied to recover organic matter, and the purified gas is mainly nitrogen, which is the protective gas introduced, and collected and recycled;

[0030] S2. Ultrasonic separation: place the lithium titanate negative plate obtained after calcination in S1 in an ultrasonic oscillator to vibrate and separate, the oscillation fre...

Embodiment 2

[0036] The recovery method of a kind of waste lithium titanate negative plate that the present invention proposes comprises the following steps:

[0037] S1. Calcination: Take the waste lithium titanate negative electrode sheet (including electrolyte) directly disassembled from the scrapped liquid-injected battery, put it into a tube furnace under the protection of helium gas, and calcinate it at 550°C for 2 hours to obtain titanic acid Lithium negative plate and exhaust gas, the exhaust gas is condensed and liquefied to recover organic matter, and the purified gas is mainly the protective gas helium, which is directly discharged;

[0038] S2. Ultrasonic separation: place the lithium titanate negative plate obtained after calcination in S1 in an ultrasonic oscillator to vibrate and separate, the oscillation frequency is 30KHz, and vibrate for 2h, so that the lithium titanate powder is separated from the aluminum foil;

[0039] S3. Sulfuric acid heap leaching: Add concentrated ...

Embodiment 3

[0044] The recovery method of a kind of waste lithium titanate negative plate that the present invention proposes comprises the following steps:

[0045] Take the waste lithium titanate negative plate that has not been injected and place it in an ultrasonic oscillator to vibrate and separate at a frequency of 40KHz for 1 hour to separate the lithium titanate powder from the aluminum foil; Add concentrated sulfuric acid at a mass ratio of 1:2, stir evenly, and place it sealed for 24 hours. After the concentrated sulfuric acid completely destroys the lithium titanate crystal lattice, add water. The weight ratio of lithium titanate powder to water is 1:5. Stir at 70°C for 2 hours, filter to obtain leaching residue and leach solution containing lithium and titanium metal; use ammonia water to adjust the pH of the leach solution to 3.5, filter, and use P204 and sulfonated kerosene to prepare the extraction agent for five-stage countercurrent extraction, wherein the saponification ra...

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Abstract

The invention discloses a method for recovering a waste lithium titanate negative electrode sheet. The method comprises the following steps: under a protection gas, calcining a waste lithium titanatenegative electrode sheet containing an electrolyte to obtain a lithium titanate negative electrode sheet; carrying out ultrasonic vibration on the lithium titanate negative electrode sheet or a wastelithium titanate negative electrode sheet which does not contain an electrolyte to enable lithium titanate powder to fall off from aluminum foil; adding concentrated sulfuric acid into the lithium titanate powder, carrying out stirring, and carrying out sealing and standing, adding water, then carrying out heating and stirring, and carrying out filtering to obtain a leachate; adjusting the pH value of the leachate and then carrying out multi-stage extraction to obtain a water phase containing titanium and lithium ions; concentrating the water phase containing the titanium and the lithium ions,and carrying out precipitation after hydrolysis to obtain metatitanic acid and a lithium sulfate solution; and carrying out evaporating crystallization on the lithium sulfate solution to obtain lithium sulfate. The method for recovering the waste lithium titanate negative electrode sheet provided by the invention can be used to separate and purify metals of aluminum, titanium, lithium and the like in the waste lithium titanate negative electrode sheet, has short process, high efficiency, excellent separation, simple operation, greenness and environmental friendliness, and has strong social values and considerable economic benefits.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium batteries, in particular to a method for recycling waste lithium titanate negative electrodes. Background technique [0002] Lithium titanate has a three-dimensional lithium ion diffusion channel unique to the spinel structure, and has the advantages of excellent power characteristics and good high and low temperature performance. Lithium titanate negative electrode Lithium-ion battery is charged, lithium ions are extracted from the positive electrode, passed through the electrolyte and diaphragm, and inserted into the negative electrode; then when discharged, lithium ions are extracted from the negative electrode, also passed through the electrolyte and diaphragm, and then inserted into the positive electrode . Such repeated cycles, because lithium ions have a relatively fixed space and position that can be accommodated in the positive and negative electrodes, ensure that the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/06C01G23/00H01M10/54
CPCY02W30/84C01D15/06C01G23/001H01M10/54
Inventor 徐懋王德钊曹利娜张鹏张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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