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A kind of preparation method of lithium ion secondary battery anode material nanometer lithium titanate

A nano-lithium titanate, secondary battery technology, used in secondary batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve problems such as poor discharge performance at high rates, and achieve improved uniformity, Excellent rate performance and cycle stability, the effect of accelerated hydrolysis

Inactive Publication Date: 2015-08-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of poor discharge performance at high rates that exist in the preparation of lithium titanate negative electrode materials in the prior art, and provide a short Li + Transmission path in battery negative electrode material lithium titanate, preparation method for improving charge-discharge performance and cycle performance

Method used

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  • A kind of preparation method of lithium ion secondary battery anode material nanometer lithium titanate
  • A kind of preparation method of lithium ion secondary battery anode material nanometer lithium titanate
  • A kind of preparation method of lithium ion secondary battery anode material nanometer lithium titanate

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Embodiment 1

[0025] Example 1: First, premix 300 ml of ethanol and 30 ml of water according to the volume ratio of 1:0.1 to form a mixed solution, and then add 15 ml of HNO 3 As the inhibitor of follow-up reaction; Li and the compound of Ti, carry out batching according to the mol ratio of Li:Ti=4.2:5, take the tetra-n-butyl titanate (analytical pure) of 25.52 g, the lithium carbonate of 2.33 g ( analytically pure), added to the previous alcohol-water-acid mixture, stirred by a magnetic heating stirrer until completely dissolved; then 20 g of ethylenediaminetetraacetic acid and 30 g of citric acid were added to the pre-mixed metal ion solution After mixing evenly, add 100 ml of ammonia water dropwise to adjust the pH value to 8, and continue to stir; after the above mixed solution is stirred evenly to form a sol, heat and stir at 80 °C until it is in a gel state, and then dry it in a blast oven at 240 °C , to obtain a black and fluffy lithium titanate precursor; put the lithium titanate pr...

Embodiment 2

[0026]Example 2: According to the volume ratio of 1:0.1, 300 ml of ethanol and 30 ml of water were premixed to form a mixed solution, and then 15 ml of HCl was added as an inhibitor of the subsequent reaction; the compound of Li and Ti was prepared according to Li:Ti=4.2 :5 molar ratio for batching, weigh 21.31 g of tetraisopropyl titanate (analytical pure), 6.43 g of lithium acetate (analytical pure), join in the previous alcohol-water-acid mixture, heat the stirrer by magnetic force Stir until it is completely dissolved; then add 20 g of ethylenediaminetetraacetic acid and 40 g of citric acid into the premixed metal ion solution, mix well, add 100 ml of ammonia water dropwise to adjust the pH value to 9, and continue stirring; After the above mixed solution was stirred evenly to form a sol, it was then heated and stirred at 80°C until it reached a gel state, and then dried in a blast oven at 240°C to obtain a black and fluffy lithium titanate precursor; put the lithium titana...

Embodiment 3

[0027] Example 3: Premix 300 ml of ethanol and 60 ml of water according to the volume ratio of 1:0.2 to form a mixed solution, and then add 30 ml of HNO 3 As the inhibitor of follow-up reaction; Li and the compound of Ti, carry out batching according to the mol ratio of Li:Ti=4.4:5, take the tetra-n-butyl titanate (analytically pure) of 25.52 g, the lithium nitrate of 4.55 g ( analytically pure), added to the previous alcohol-water-acid mixture, stirred by a magnetic heating stirrer until completely dissolved; then 20 g of ethylenediaminetetraacetic acid and 60 g of citric acid were added to the pre-mixed metal ion solution After mixing evenly, add 110 ml of ammonia water dropwise to adjust the pH value to 7, and continue to stir; after the above mixed solution is stirred evenly to form a sol, heat and stir at 80°C until it reaches a gel state, and then dry it in a blast oven at 240°C , to obtain a black and fluffy lithium titanate precursor; put the lithium titanate precursor...

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Abstract

The invention provides a preparation method of a cathode material nano lithium titanate of a lithium ion secondary battery. The method includes preparing a soluble Li compound and a soluble Ti compound through a sol-gel method according to a molar ration of Li / Ti=0.8-1.0, adding into an alcohol-water mixed solvent mixed with a hydrolysis inhibitor, adding bi-component chelating agent to carry out a chelation reaction with metal ions in alkaline conditions, stirring, heating, gelling, maintaining the temperature at 150-250 DEG C for 3-24 h to obtain a sintering precursor, subjecting the precursor to ball milling, and maintaining the temperature at 600-900 DEG C for 5-15 h to obtain a finished product of a nano Li4Ti5O12 cathode material. The lithium titanate prepared by the method has good dispersion effects and significantly improves a phenomenon of agglomeration of nano powder. The lithium titanate cathode material has a first specific discharge capacity of 166 mAh / g at the multiplying power of 1C at room temperature, and already has a specific discharge capacity about 110 mAh / g at the multiplying power of 10C. The lithium titanate cathode material shows excellent multiplying power performance and cycling stability, and can be widely applied for potable equipment and for the power battery field.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion secondary battery negative electrode material, in particular to a preparation method of a lithium ion secondary battery negative electrode material nano lithium titanate. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, no memory effect, and small self-discharge. They dominate the energy storage battery market and are widely used in portable electronic products such as notebook computers, mobile phones, PDAs, and digital cameras. With the development of new technologies and the depletion of fossil resources, this type of secondary energy storage battery has been gradually applied in the field of energy-saving clean vehicles such as electric bicycles and electric vehicles. Among the existing battery systems, lithium secondary batteries are recognized as one of the power batteries that can better meet the requirements of electric vehicl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485C01G23/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G23/00H01M4/485H01M10/0525Y02E60/10
Inventor 张春明王丹汪元元何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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