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Method for preparing lithium titanate from inorganic titanium source, product and application

A technology of lithium titanate and inorganic titanium is applied in the field of preparation of negative electrode materials for lithium ion batteries, which can solve the problems of insufficient purity of pure titanium oxysulfate, difficulty in flue gas treatment, residual organic solvent, etc., and achieve stable product quality, low cost, The effect of not easy to sinter

Active Publication Date: 2018-09-14
安徽迪诺环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that the pure titanyl sulfate obtained in the method for preparing lithium titanate from an existing inorganic titanium source is not pure enough, organic solvents will remain as a stabilizer, and the treatment of flue gas is difficult. Preparation method, product and application of lithium titanate from inorganic titanium source

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: A method for preparing lithium titanate from an inorganic titanium source, which includes the following steps: (1) Titanium concentrate and sulfuric acid are acidified and precipitated to obtain a titanyl sulfate solution; the temperature of the titanyl sulfate solution is controlled at 50°C, Plate and frame hot filtration of titanyl sulfate solution to remove insoluble impurities; (2). Cool the titanyl sulfate solution to 5°C, and remove ferrous sulfate through solid-liquid separation through a membrane filter device to control the ratio of iron to titanium 0.5g / l; (6) Wash the nano-level metatitanic acid with a plate and frame filter press for 5 hours, use deionized water as the water source, and control the water temperature at 55°C. Iron content <10ppm; (7), add deionized water to adjust the concentration of nano-scale metatitanic acid to 200g / l, add concentrated sulfuric acid, adjust the pH to 4, add lithium hydroxide at the molar ratio of Li:Ti=1:8.57 To...

Embodiment 2

[0015] Example 2: A method for preparing lithium titanate from an inorganic titanium source, which includes the following steps: (1) Titanium concentrate and sulfuric acid are acidified and precipitated to obtain a titanyl sulfate solution; the temperature of the titanyl sulfate solution is controlled at 55°C, Plate and frame hot filter titanyl sulfate solution to remove insoluble impurities; (2). Cool the titanyl sulfate solution to 4°C, and remove ferrous sulfate through solid-liquid separation through a membrane filter device to control the ratio of iron to titanium 0.5g / l; (6) Use a plate and frame filter press to wash the nano-level metatitanic acid for 5 hours, use deionized water as the water source, and control the water temperature at 60°C. Iron content <10ppm; (7), add deionized water to adjust the concentration of nano-scale metatitanic acid to 210g / l, add concentrated sulfuric acid, adjust the pH to 4.5, add lithium hydroxide according to the molar ratio of Li:Ti=1:8...

Embodiment 3

[0016] Example 3: A method for preparing lithium titanate from an inorganic titanium source, which includes the following steps: (1) Titanium concentrate and sulfuric acid undergo acid hydrolysis and precipitation to obtain a titanyl sulfate solution; the temperature of the titanyl sulfate solution is controlled at 60°C, Plate and frame hot filtration of titanyl sulfate solution to remove insoluble impurities; (2). Cool the titanyl sulfate solution to 2°C, and remove ferrous sulfate through solid-liquid separation through a membrane filter device to control the ratio of iron to titanium 0.5g / l; (6) Wash the nano-grade metatitanic acid with a plate and frame filter press for 5 hours, use deionized water as the water source, and control the temperature at 65°C. Iron content <10ppm; (7), add deionized water to adjust the concentration of nano-scale metatitanic acid to 220g / l, add concentrated sulfuric acid, adjust the pH to 5, add lithium hydroxide according to the molar ratio of L...

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Abstract

The invention discloses a method for preparing lithium titanate from an inorganic titanium source. The method comprises the following steps: preparing titanium oxysulfate by adopting a titanium concentrate sulfuric acid method; after freezing, carrying out membrane filtering to prepare a relatively pure titanium oxysulfate solution; preparing nano-grade titanium dioxide hydrate through a rapid crystal-seed-free hydrolysis method; after washing, adding aluminum powder to reduce residual iron through sulfuric acid; then carrying out the membrane filtering to obtain pure metatitanic acid slurry;adding a proper amount of lithium hydroxide into an acidic environment added with the sulfuric acid, and synthesizing; after calcining, obtaining the high-purity nano lithium titanate. The method disclosed by the invention has the beneficial effects that the nano lithium titanate can be prepared without the need of adding an expensive organic solvent and the cost is low; the calcining temperatureis low and a product is not easy to sinter and has stable quality; the product has low impurity content and can be used for a high-end lithium battery negative electrode material; the method can be used for industrialized large-scale production.

Description

Technical field [0001] The present invention relates to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a method, product and application for preparing lithium titanate from an inorganic titanium source. Background technique [0002] Lithium titanate (Li4Ti5O12) has a spinel structure, it is not easy to cause metal lithium precipitation during charge and discharge, has high Coulomb efficiency, and lithium ion diffusion coefficient (2x IO-8 cm2 / s) is one order of magnitude higher than carbon anode. It has the characteristics of more charging times, faster charging process and safer for the next generation of lithium-ion batteries. If Li4Ti5O12 is used as the negative electrode material of lithium-ion batteries, the rapid charge-discharge performance, cycle and safety performance of the system can be improved. Further exploration and research on the preparation process of this material, improving the application perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485
CPCC01G23/003H01M4/485Y02E60/10
Inventor 荚玉冬
Owner 安徽迪诺环保新材料科技有限公司
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