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Preparation method of yttrium-containing lithium titanate serving as cathode material of lithium ion secondary battery

A technology for secondary batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor discharge performance at high rates, and achieve the effect of improving electrical conductivity, excellent rate performance and cycle performance

Inactive Publication Date: 2011-05-04
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • 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 in the preparation of lithium titanate negative electrode materials in the prior art, and propose a method to improve the electronic conductivity, charge and discharge performance and cycle performance of lithium titanate, a negative electrode material for lithium ion batteries. Methods

Method used

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  • Preparation method of yttrium-containing lithium titanate serving as cathode material of lithium ion secondary battery
  • Preparation method of yttrium-containing lithium titanate serving as cathode material of lithium ion secondary battery
  • Preparation method of yttrium-containing lithium titanate serving as cathode material of lithium ion secondary battery

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Embodiment 1

[0024] Synthesize 10 grams of Li 4 Y 0.1 Ti 4.9 o 12 , according to the molar ratio Li:Ti:Y=50:49:1, take by weighing 35.97 grams of tetrabutyl orthotitanate (analytical pure), 11.01 gram of lithium acetate (analytical pure) and 0.8266 gram of yttrium nitrate (analytical pure) ), 4.32 grams of lauric acid (analytically pure), which were dissolved in 8 milliliters of absolute ethanol respectively. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl orthotitanate, mix evenly under magnetic stirring, and react for 10 minutes, then add the ethanol solution of yttrium nitrate to the mixed solution, and wait for 10 minutes to react. Add an ethanol solution of lauric acid to the solution, and react for 25 hours at room temperature to obtain a uniform milky white gel. The gel was aged in the air for 24 hours, and then dried in an oven at 100° C. to obtain a pale yellow precursor. Put the precursor into a ball mill jar, add an appropriate amo...

Embodiment 2

[0030] Synthetic Li 4 Y 0.15 Ti 4.85 o 12 / C composite material, where Li 4 Y 0.15 Ti 4.85 o 12 The quality of is 10 grams, according to molar ratio Li:Ti:Y=80:97:3, takes by weighing 35.45 grams of tetrabutyl orthotitanate (analytical pure), 10.96 grams of lithium acetate (analytical pure) and 1.23 grams Yttrium nitrate (analytical pure), 3.65 g of citric acid (analytical pure), were dissolved in 10 ml of absolute ethanol. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl orthotitanate, mix evenly under magnetic stirring, and react for 15 minutes, then add the ethanol solution of yttrium nitrate to the mixed solution, wait for reaction for 15 minutes, and add Ethanol solution of citric acid was added to the solution, and reacted for 25 hours at room temperature to obtain a uniform milky white gel. The gel was aged in the air for 24 hours, and then dried in an oven at 120° C. to obtain a pale yellow precursor. Put the precursor...

Embodiment 3

[0032] Synthesize 10g of Li 4 Y 0.2 Ti 4.8 o 12, according to the molar ratio Li:Ti:Y=25:24:1, take by weighing 34.93 grams of tetrabutyl orthotitanate (analytical pure), 10.91 gram of lithium acetate (analytical pure) and 1.64 gram of yttrium nitrate (analytical pure) ), 1.56 grams of polyethylene glycol and 1.85 grams of citric acid (analytically pure), which were dissolved in 15 milliliters of absolute ethanol respectively. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl orthotitanate, mix evenly under magnetic stirring, and react for 10 minutes, then add the ethanol solution of yttrium nitrate to the mixed solution, and wait for 10 minutes to react. The ethanol solution of citric acid and polyethylene glycol was sequentially added into the solution, and reacted for 18 hours at room temperature to obtain a uniform milky white gel. The gel was aged in the air for 24 hours, and then dried in an oven at 100° C. to obtain a pale ye...

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Abstract

The invention provides a preparation method for improving the electrical conductivity, charging and discharging performance and circulating performance of lithium titanate serving as the cathode material of a lithium ion battery. The method comprises the following steps of: adding a complexing agent into a soluble compound of Li which serves as a lithium source and a soluble compound of Ti which serves as a titanium source; doping yttrium ions by a sol-gel method; and controlling a sintering atmosphere so as to prepare yttrium-containing lithium titanate nanocrystalline and a lithium titanate / C composite material, wherein the lithium titanate composite cathode material has high magnification performance. Through the method, nanocrystalline with high dispersibility and pyrolytic carbon which is uniformly dispersed around or on the surfaces of particles can be prepared and the electrical conductivity of a product is improved remarkably. The yttrium-containing lithium titanate cathode material prepared by the method has high magnification performance and is suitable for power batteries.

Description

technical field [0001] The invention relates to a preparation method of lithium titanate, in particular to a preparation method of lithium titanate, a lithium ion secondary battery negative electrode material containing yttrium. Background technique [0002] Due to its high energy density, low self-discharge, and no memory effect, lithium-ion batteries have a dominant position in the secondary battery market and are widely used in electronic products such as notebook computers and mobile phones. At present, commercial lithium-ion batteries mostly use carbon materials such as graphite as the negative electrode and lithium titanate (LiCoO 2 ) to form a rocking chair rechargeable battery. Although compared with metal lithium, carbon materials have greatly improved in terms of safety performance and cycle performance, but there are still insurmountable shortcomings: they react with the electrolyte to form a surface passivation film, resulting in electrolyte consumption and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/10
Inventor 王瑾王丹张鹏
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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