Preparation method of nano-lithium titanate with particles uniformly dispersed in lithium-ion battery electrode material

A lithium-ion battery and nano-lithium titanate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor discharge performance and shortening at high rates, shorten the transmission path, improve charge and discharge performance and cycle performance , the effect of good cycle stability

Inactive Publication Date: 2015-11-18
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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, to provide a method that can break up particle agglomeration and reduce particle size at the same time, and can control the particle size and size of the product. Uniform dispersion, in order to shorten the 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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  • Preparation method of nano-lithium titanate with particles uniformly dispersed in lithium-ion battery electrode material
  • Preparation method of nano-lithium titanate with particles uniformly dispersed in lithium-ion battery electrode material
  • Preparation method of nano-lithium titanate with particles uniformly dispersed in lithium-ion battery electrode material

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Experimental program
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Effect test

Embodiment 1

[0027] First, mix the slightly soluble or soluble compounds of lithium and titanium according to the molar ratio of Li:Ti=4.02:5, and weigh 19.97g of rutile TiO 2 , 7.426g of lithium lithium carbonate, and add agate balls as a ball milling medium, add 80mL of dehydrated alcohol as a solvent, then put into a planetary ball mill for ball milling for 10 hours, and the speed of ball milling is 400r / min; The material is taken out, put into the blast drying box and dry, the temperature is 80 ℃, then the gained Li 4 Ti 5 o 12 The precursor was calcined in a muffle furnace at 800 °C for 7 hours; then the prepared Li 4 Ti 5 o12 The powder is taken out and ground, and then 100g of powder is mixed with 200mL of water and put into an ultra-high-speed nano pulverizer for pulverization. The accelerated pulverized material collides, shears, and tears with the pulverizer in the pulverization chamber at a speed of 2000r / min, the pulverization time is 3 hours; Utilize peristaltic pump to ab...

Embodiment 2

[0030] First, mix the slightly soluble or soluble compounds of lithium and titanium according to the molar ratio of Li:Ti=4.04:5, and weigh 23.964g of rutile TiO 2 , the lithium lithium carbonate of 8.9111g, and add agate ball as ball milling medium, add the dehydrated alcohol of 100mL as solvent, put into planetary ball mill then and ball mill for 10 hours, the rotating speed of ball mill is 400r / min; The material is taken out, put into the blast drying box and dry, the temperature is 80 ℃, then the gained Li 4 Ti 5 o 12 The precursor was calcined in a muffle furnace at 800 °C for 7 hours; then the prepared Li 4 Ti 5 o 12 The powder is taken out and ground, and then 100g of powder is mixed with 200mL of water and put into an ultra-high-speed nano pulverizer for pulverization. The accelerated pulverized material collides, shears, and tears with the pulverizer in the pulverization chamber at a speed of 2000r / min, crushing time is 5 hours; Utilize peristaltic pump to above-...

Embodiment 3

[0032] Embodiment 3: First, the slightly soluble or soluble compounds of lithium and titanium are dosed according to the molar ratio of Li:Ti=4.04:5, and the anatase TiO of 19.97g is weighed 2 , 15.9167g of lithium acetate, and add agate balls as a ball milling medium, add 120mL of absolute ethanol as a solvent, then put it into a planetary ball mill and mill it for 10 hours at a speed of 500r / min; then mill the material in the jar Take it out, put it into a blast drying oven and dry it at a temperature of 80 ° C, and then the obtained Li 4 Ti 5 o 12 The precursor was put into a muffle furnace and calcined at 800°C for 12 hours; then the prepared Li 4 Ti 5 o 12 The powder is taken out and ground, and then 100g of powder is mixed with 200mL of water and put into an ultra-high-speed nano pulverizer for pulverization. The accelerated pulverized material collides, shears, and tears with the pulverizer in the pulverization chamber at a speed of 2500r / min, the pulverization tim...

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Abstract

The invention provides a preparation method of lithium ion batteryelectrode material nano lithium titanate (Li4Ti5O12) with uniformly-dispersed particles. The preparation method is as follows: firstly, using a high temperature solid state method to obtain initial Li4Ti5O12 material, mixing the initial material with water, using a super high speed nano grinder for preprocessing in a speed of 1000-3000r / min; then using a spray dryer for drying the Li4Ti5O12 and water evenly-mixed liquid to obtain Li4Ti5O12 powder with different particle size ranges; finally performing high temperature quenching treatment on the prepared Li4Ti5O12 powder to obtain the nano Li4Ti5O12 electrode material with a good dispersion effect. The first specific discharge capacity of the Li4Ti5O12 material prepared by the preparation method can reach 180mAh / g under 1C rate at the room temperature, the specific discharge capacity is 105mAh / g around under 20C rate, and the Li4Ti5O12 material shows excellent rate capability and cycle stability, and can be widely used in the field of portable devices and power batteries.

Description

technical field [0001] The present invention relates to a kind of nano lithium titanate (Li 4 Ti 5 o 12 ) preparation method, especially relates to a lithium ion secondary battery electrode material nano lithium titanate (Li 4 Ti 5 o 12 ) method of preparation. 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 battery technology and the depletion of fossil energy, lithium batteries have been gradually applied in the fields of energy-saving clean vehicles such as electric bicycles and electric vehicles. Among the existing battery systems, lithium batteries are recognized as one of the power batteries that can better meet the requirements of electric vehicles for power output, drivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCY02E60/122H01M4/485Y02E60/10
Inventor 张春明王丹吴晓燕汪元元何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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