Preparation method of carbon-coated lithium titanate composite material for lithium ion power battery

A power battery and lithium titanate-coated technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor electronic conductivity, poor rate performance, and severe polarization, and achieve low production costs and stable cycle performance , The effect of high charge and discharge capacity

Inactive Publication Date: 2012-07-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since the lithium titanate material is a semiconductor material, the electronic conductivity is poor, resulting in serious polarization phenomenon and poor rate performance when the lithium-ion battery is charged and discharged at a high rate.

Method used

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  • Preparation method of carbon-coated lithium titanate composite material for lithium ion power battery
  • Preparation method of carbon-coated lithium titanate composite material for lithium ion power battery
  • Preparation method of carbon-coated lithium titanate composite material for lithium ion power battery

Examples

Experimental program
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Embodiment 1

[0016] 1. Using needle coke as raw material, the amphiphilic carbon material was prepared by a general known preparation method. The specific preparation process was as follows: 100 mL of mixed acid (concentrated nitric acid with a mass concentration of 65% and concentrated sulfuric acid with a mass concentration of 98% by volume ratio of 3:7) heated to 80°C, stirred at a stirring rate of 300r / min, added 10g of needle coke, reacted for 1h, poured the reactant into 1L of deionized water to terminate the reaction, and filtered it with a vacuum filtration device to obtain The filter cake was washed with deionized water until neutral; the obtained solid matter was added to 500ml of NaOH solution with a concentration of 1mol / L, stirred at 80°C at a speed of 300r / min for 1h, and filtered under reduced pressure. The pH value of the solution is always greater than 12; collect the filtrate, add 1mol / L HCl dropwise to the obtained filtrate, and adjust the pH value to 1, at this time, a p...

Embodiment 2

[0020] 1. The difference is that the initial raw material is coal tar pitch. The coal tar pitch-based amphiphilic carbon material is prepared according to the method in step 1 of Example 1.

[0021] 2. Dissolve 2.4g of the coal tar pitch-based amphiphilic carbon material prepared in step 1 in 300ml of deionized water, add 1 drop of ammonia water to make the solution alkaline, add 30g of lithium titanate powder, and heat up to 90°C at 200r / min After stirring for 5 hours at a certain stirring speed, the water was evaporated to dryness, and then dried in an oven at 100°C for 24 hours. The obtained composite material was placed in a high-temperature carbonization furnace, and under the protection of nitrogen, the temperature was raised to 700°C at a heating rate of 5°C / min, and after being kept for 4 hours, it was naturally cooled to room temperature to obtain an amphiphilic carbon material coated lithium titanate Composite electrode material.

[0022] 3. Mix 0.8g of the composit...

Embodiment 3

[0024] 1. The difference is that the initial raw material is petroleum coke, and the petroleum coke-based amphiphilic carbon material is prepared according to the method of step 1 of Example 1.

[0025] 2. Dissolve 1.6g of the petroleum coke-based amphiphilic carbon material prepared in step 1 in 200ml of deionized water, add 1 drop of ammonia water to make the solution alkaline, add 20g of lithium titanate powder, heat up to 85°C at 200r / min After stirring for 5 hours at a certain stirring rate, the water was evaporated to dryness, and then dried in an oven at 120°C for 18 hours. The obtained composite material was placed in a high-temperature carbonization furnace, and under the protection of nitrogen, the temperature was raised to 1000°C at a heating rate of 5°C / min, and after being kept for 0.5h, it was naturally cooled to room temperature to obtain amphiphilic carbon material coated titanic acid Lithium composite electrode material.

[0026] 3. Mix 0.8g of the composite ...

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Abstract

The invention discloses a preparation method of a carbon-coated lithium titanate composite material for a lithium ion power battery. The method comprises the following steps of: dissolving an amphiphilic carbon material into water at room temperature to prepare suspension, adding lithium titanate and mixing uniformly; heating to 80-90 DEG C, evaporating to dryness, and drying; performing constant-temperature thermal treatment for 0.5-10 hours at 500-1,000 DEG C to obtain the lithium titanate with a particle size of 100-400nm serving as a kernel; and coating the kernel with an amphiphilic carbon material with thickness of 3nm. The preparation method disclosed by the invention is environment-friendly, has a simple preparation process and is easy to realize large-scale production. The prepared material has large charge / discharge capacity, excellent heavy-current charge / discharge performance and stable cycle performance when used as a lithium ion battery cathode material, wherein the 10C discharge / charge capacity is 160mAh / g, the 20C discharge / charge capacity reaches 143mAh / g, and the capacity retention rate reaches 91% after 100 times of heavy-current 20C discharge and charge.

Description

technical field [0001] The invention relates to a preparation method of a carbon-coated lithium titanate composite material for lithium-ion power batteries, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, the research focus of negative electrode materials for lithium-ion batteries is developing in the direction of power battery materials with high specific capacity, high charge-discharge efficiency, high cycle performance, and high-rate charge-discharge resistance. The existing commercial lithium-ion battery anode material is carbon anode material, but carbon anode material has some defects, such as: SEI film (solid electrolyte interfacial film) is formed during the first discharge process, resulting in irreversible capacity loss, high temperature may lead to battery failure Or cause safety problems, poor high-current charge and discharge performance, etc. These problems make this material unable to meet the needs of high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 王成扬郭雪飞陈明鸣王九洲
Owner TIANJIN UNIV
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