Preparation method of low-cost lithium titanate material

A lithium titanate, low-cost technology, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problem of high price of lithium titanate materials, and achieve superior electrochemical performance, low raw material cost, and less time-consuming. Effect

Inactive Publication Date: 2019-06-14
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, lithium titanate materials are relatively expensive compared to carbon materials. How to prep

Method used

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  • Preparation method of low-cost lithium titanate material
  • Preparation method of low-cost lithium titanate material
  • Preparation method of low-cost lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of peroxo-titanium complex solution

[0025] According to the mass volume ratio of 1:10, metatitanic acid and hydrogen peroxide were accurately weighed and put into the reactor for stirring, and an appropriate amount of ammonia water was added to control the pH value of the solution to be 10 to obtain a stable peroxotitanium complex solution.

[0026] (2) Preparation of lithium titanate material

[0027] Accurately weigh lithium hydroxide monohydrate according to the lithium-titanium molar ratio of 0.86 and add it to the above titanium peroxo complex solution, add an appropriate amount of dispersant polyvinylpyrrolidone, stir to form a uniform solution, freeze-dry, and calcinate at 800°C for 8 hours to obtain titanic acid lithium material.

[0028] After the electrochemical performance test, after the lithium titanate material prepared in this example is prepared into a half-cell, the test shows that the first discharge specific capacity at a rate of 0....

Embodiment 2

[0030] (1) Preparation of peroxo-titanium complex solution

[0031] According to the mass volume ratio of 1:20, metatitanic acid and hydrogen peroxide were accurately weighed and put into the reactor for stirring, and an appropriate amount of ammonia water was added to control the pH value of the solution to 11 to obtain a stable peroxotitanium complex solution.

[0032] (2) Preparation of lithium titanate material

[0033] Accurately weigh lithium carbonate according to the lithium-titanium molar ratio of 0.86 and add it to the above titanium peroxo complex solution, add an appropriate amount of dispersant polyethylene glycol, stir to form a uniform solution, freeze-dry, and calcinate at 700°C for 10 hours to obtain lithium titanate material .

[0034] After the electrochemical performance test, after the lithium titanate material prepared in this example is prepared into a half-cell, the test shows that the first discharge specific capacity at a rate of 0.2C is 170mAh / g.

Embodiment 3

[0036] (1) Preparation of peroxo-titanium complex solution

[0037] According to the mass volume ratio of 1:30, metatitanic acid and hydrogen peroxide were accurately weighed and put into the reactor for stirring, and an appropriate amount of ammonia water was added to control the pH value of the solution to be 12 to obtain a stable peroxotitanium complex solution.

[0038] (2) Preparation of lithium titanate material

[0039] Accurately weigh lithium hydroxide monohydrate according to the lithium-titanium molar ratio of 0.84 and add it to the above titanium peroxo complex solution, add an appropriate amount of dispersant polyvinylpyrrolidone, stir to form a uniform solution, freeze-dry, and calcinate at 800°C for 8 hours to obtain titanic acid lithium material.

[0040] After the electrochemical performance test, after the lithium titanate material prepared in this example is prepared into a half-cell, the test shows that the first discharge specific capacity at 0.2C rate is...

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Abstract

The invention provides a preparation method of a low-cost lithium titanate material. The preparation method comprises the following steps of (1) allowing metatitanic acid to react with hydrogen peroxide, adding an appropriate amount of ammonia water to form a stable titanium peroxide complex solution; and (2) weighting a lithium source according to a proportion, adding the lithium source into thetitanium peroxide complex solution prepared in the step (1), adding a dispersing agent, stirring to form a uniform solution, and drying and roasting to prepare the lithium titanate material. The low-cost metatitanic acid (the cost is about one third of titanium dioxide) is a titanium source, the cost is reduced, the appropriate amount of hydrogen peroxide and the ammonia water to prepare the stable titanium peroxide complex compound, the titanium peroxide complex compound more fully reacts with a lithium salt, the prepared lithium titanate material is excellent in performance, the half-batteryinitial capacity is 174mAh/g, and the initial charge-discharge efficiency is larger than 95%.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials of lithium ion batteries, in particular to a preparation method of a low-cost lithium titanate material. Background technique [0002] With the aggravation of global energy crisis and environmental pollution, the development and application of new energy is imperative. Lithium-ion batteries have developed rapidly since they were commercialized in the 1990s. Compared with traditional chemical batteries, it has the advantages of light weight, small size, high voltage, high specific energy, wide operating temperature range, high specific power, stable discharge, long storage time, no memory effect, and no pollution. At present, lithium-ion batteries have been widely used in portable electronic products such as mobile phones, digital cameras, and notebook computers, and have shown broad application prospects in electric vehicles (EV), hybrid electric vehicles (HEV) and energy sto...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525C01G23/00
CPCY02E60/10
Inventor 刘艳侠张鹏飞柴丰涛赵冲冲侯奥林张锁江
Owner 郑州中科新兴产业技术研究院
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