Lanthanum lithium titanate doped composite negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electronic conductivity of lithium titanate and limit high-rate performance, shorten heat treatment time, and facilitate migration and migration output and increase productivity

Active Publication Date: 2013-06-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium titanate has poor electronic conductivity, which limits its high-rate performance.

Method used

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  • Lanthanum lithium titanate doped composite negative electrode material of lithium ion battery and preparation method thereof
  • Lanthanum lithium titanate doped composite negative electrode material of lithium ion battery and preparation method thereof
  • Lanthanum lithium titanate doped composite negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Disperse 28.4ml of isopropyl titanate in 60ml of deionized water; disperse 4.2g of lithium nitrate in 40ml of deionized water, and keep the molar ratio of lithium and titanium n Li :n Ti =1:1, mix the two liquids, stir for 30min;

[0025] 2) According to 1‰ of the product mass (total mass of lithium source and titanium source material), add 0.07ml of lanthanum source solution with a lanthanum ion concentration of 1mol / L; magnetically stir for 1h, pour the mixed solution into a hydrothermal reaction kettle, Then place it in an oven at 200°C to react for 5 hours. After the reaction, cool naturally to room temperature, then perform suction filtration, wash with deionized water, and dry at 60°C to obtain a lanthanum-doped lithium titanate precursor;

[0026] 3) The obtained precursor was sintered at 800°C for 2 h in a nitrogen atmosphere, and the obtained product was a nanoscale lanthanum-doped lithium titanate material.

[0027] The sample was analyzed by D\max-2550 X...

Embodiment 2

[0031] 1) Add 10g of amorphous TiO 2 Disperse in 50ml deionized water; disperse 12.14g lithium acetate in 50ml deionized water, and keep the molar ratio of lithium and titanium n Li :n Ti =1:1.05, mix the two liquids, stir for 30 minutes;

[0032] 2) Add 0.86ml of lanthanum nitrate solution with a concentration of 1mol / L according to 1% of the product weight; magnetically stir for 1 hour, pour the mixed solution into a hydrothermal reaction kettle, and then place it in an oven at 120°C for 24 hours. , naturally cooled to room temperature, then suction filtered, washed with deionized water, and dried at 120°C to obtain a lanthanum-doped lithium titanate precursor;

[0033] 3) The obtained precursor is sintered at 1000° C. for 1 hour under a nitrogen atmosphere, and the obtained product is a nanoscale lanthanum-doped lithium titanate material.

[0034] Its test method is the same as that of Example 1, and the first discharge specific capacity reaches 195mAh g -1 . The speci...

Embodiment 3

[0036] 1) Disperse 28.46ml of isopropyl titanate in 30ml of deionized water; disperse 6.26g of lithium hydroxide monohydrate in 20ml of deionized water, and keep the molar ratio of lithium and titanium n Li :n Ti =1:1.1; Mix the two liquids and stir for 30 minutes;

[0037]2) Pour the mixed solution into a hydrothermal reaction kettle, and then place it in an oven at 160°C for 10 hours to react. After the reaction, cool down to room temperature naturally, then perform suction filtration, wash with deionized water, and dry at 100°C to obtain lithium titanate Precursor: Add 0.5g of precursor and 0.015g of lanthanum sulfate into a 50ml reaction kettle, react at 200°C for 5 hours, and then cool naturally. Then perform suction filtration, wash with deionized water, and dry at 100°C to obtain a lanthanum-doped lithium titanate precursor;

[0038] 3) The obtained precursor was sintered at 600° C. for 5 h under a nitrogen atmosphere, and the obtained product was a nanoscale lanthanu...

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Abstract

The invention discloses a lanthanum lithium titanate doped composite negative electrode material of a lithium ion battery and a preparation method thereof. Lithium titanate in nanoscale is prepared and meanwhile lanthanum doping modification is performed on lithium titanate according to the method. Chemical components and grain size of lithium titanate are effectively controlled by hydro-thermal treatment, so that subsequent treatment temperature is greatly reduced, particle conglomeration is prevented, and the method is more prone to industrial implementation. In preparation, lanthanum is doped, so that the discharge specific capacity of the material is improved. The material prepared according to the invention is great in multiplying power and high in specific capacity, and can be used for batteries required by various portable electronic devices and various electromobiles.

Description

technical field [0001] The invention relates to a lithium-ion battery composite negative electrode material doped with lanthanum lithium titanate and a preparation method thereof, belonging to the technical field of preparation of electrochemical power source materials. 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, large rate, high cycle performance and high safety performance. The traditional negative electrode material is carbon negative electrode material. Although the carbon negative electrode has been successfully commercialized, its battery safety problems, especially at high rates, force people to look for safe and reliable new negative electrode materials that can intercalate lithium at a slightly positive potential than the carbon negative electrode. Among them, low-potential transition metal oxides and comp...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/10
Inventor 施利毅程崇领刘洪江薛鑫
Owner SHANGHAI UNIV
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