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Method for regenerating lithium titanate serving as anode material of waste lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery recycling, chemical instruments and methods, titanium compounds, etc., can solve the problem of no recycling method, achieve good electrical performance, meet market requirements, and reduce environmental pollution.

Active Publication Date: 2012-03-28
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective recycling method for waste lithium titanate anode materials.

Method used

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  • Method for regenerating lithium titanate serving as anode material of waste lithium ion battery
  • Method for regenerating lithium titanate serving as anode material of waste lithium ion battery
  • Method for regenerating lithium titanate serving as anode material of waste lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 500 g of the lithium titanate negative electrode sheet of the waste lithium-ion battery, and its chemical composition is shown in Table 1 after testing.

[0027] Table 1 Chemical composition of waste lithium titanate negative electrode sheet before pretreatment

[0028] detection element

Ti

Cu

Li

Fe

Ca

Mg

other

Mass percentage (%)

36.27

18.20

4.22

0.01

0.01

0.01

41.28

[0029] Put the negative electrode sheet into a muffle furnace and sinter at 500°C for 30 minutes to remove organic matter. The sintered negative electrode sheet was pulverized by a pulverizer and passed through a 60-mesh sieve to obtain 462 g of under-sieve material. The chemical composition is shown in Table 2.

[0030] Table 2 Chemical composition of waste lithium titanate negative electrode sheet after pretreatment

[0031] detection element

Embodiment 2

[0033] Take 400g of the above-mentioned undersize, add 700mL of 96% sulfuric acid, stir with air, react for 3 hours, add to 1000mL aqueous solution after aging for 2 hours, filter after stirring for 0.5h, and dilute the filtrate to 2000mL. The detected components are shown in Table 3. The main reactions that occur are as follows:

[0034] Li 4 Ti 5 o 12 +12H 2 SO 4 (concentrated)→5Ti(SO 4 ) 2 +2Li 2 SO 4 +12H 2 o

[0035] Cu+2H 2 SO 4 (concentrated)→CuSO 4 +SO 2 ↑+2H 2 o

[0036] Cu+H 2 SO 4 (concentrated)→CuO+SO 2 ↑+H 2 o

[0037] Table 3 Filtrate Components

[0038] detection element

Embodiment 3

[0040] Add ammonia water to the above filtrate to adjust the pH value to 2.0, then add sodium sulfite to adjust the reduction potential of the solution to 0.35V, raise the temperature of the solution to 80°C, add an appropriate amount of dilute sulfuric acid to maintain the pH value of the solution at about 2.0, stir for 3 hours, and filter to obtain Metatitanic acid and filtrate. After the metatitanic acid was washed with a small amount of water, it was placed in a blast drying oven and dried at 100°C for 5 hours to obtain 320.76 g of metatitanic acid, the composition of which is shown in Table 4:

[0041] Table 4 Main components of metatitanic acid

[0042] detection element

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Abstract

The invention discloses a method for regenerating lithium titanate serving as an anode material of a waste lithium ion battery. The method comprises the following steps of: pretreating the anode material of the waste lithium ion battery and acid-leaching the pretreated anode material; diluting leachate; adjusting the pH value of the leachate; performing oxidation-reduction potential; filtering the leachate; heating filtrate to hydrolyze the filtrate, and filtering after complete hydrolysis; washing and drying the obtained residue to prepare metatitanic acid; performing impurity removal, concentration and lithium precipitation on the obtained filtrate, washing and drying to prepare lithium carbonate; and mixing the metatitanic acid and the lithium carbonate according to a stoichiometric ratio, and sintering to prepare the lithium titanate anode material. By the method, cyclic regeneration of waste lithium titanate is realized; the lithium titanate has the characteristics of low environmental pollution, high recycling rate, convenience for industrialization and the like; the synthesized lithium titanate has higher electric performance and can meet a market requirement.

Description

technical field [0001] The invention relates to a regeneration method for a negative electrode material of a waste lithium ion battery, in particular to a regeneration and recovery technology for a negative electrode of lithium titanate. Background technique [0002] Secondary lithium-ion batteries have been widely used in mobile communications, electric tools, electric bicycles, power vehicles, etc. According to statistics, the global demand for lithium batteries in 2007 was 2.66 billion. With the development of power vehicles, the lithium battery industry will develop rapidly. [0003] Spinel structure lithium titanate (Li 4 Ti 5 o 12 ) has very good cycle performance, known as "zero strain" material, no structural change occurs during charge and discharge, good cycle performance, good charge and discharge platform, theoretical specific capacity is 175mAh / g, actual specific capacity It can reach 165mAh / g, and it is concentrated in the platform area, does not react with...

Claims

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Application Information

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IPC IPC(8): C01G23/00
CPCY02W30/84
Inventor 刘更好李长东周汉章唐红辉龙桂花韦利剑
Owner GUANGDONG BRUNP RECYCLING TECH
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