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Lithium ion-type supercapacitor ternary composite negative electrode material and preparation method thereof

A technology for supercapacitors and negative electrode materials, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, and can solve the problems of low conductivity of lithium titanate.

Active Publication Date: 2015-06-24
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low conductivity of lithium titanate, and to provide a lithium-ion supercapacitor ternary composite negative electrode material and its preparation method

Method used

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  • Lithium ion-type supercapacitor ternary composite negative electrode material and preparation method thereof
  • Lithium ion-type supercapacitor ternary composite negative electrode material and preparation method thereof
  • Lithium ion-type supercapacitor ternary composite negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0036] Sinter 0.4g of carbon nanotubes at 500°C for 30min, then disperse in a mixed solution of 30ml of concentrated nitric acid and 10ml of concentrated sulfuric acid, heat to 70°C, ultrasonicate for 3h, then wash with distilled water and centrifuge 5 times until neutral, then filter with suction . The morphology of carbon nanotubes before and after purification is as follows: figure 1 and figure 2shown. The purified carbon nanotubes were mixed with 20 ml of 5% sodium dodecylbenzenesulfonate and sonicated for 4 h, and ethanol was added and stirred for 30 min. Dissolve 7.4074g of tetrabutyl titanate in a mixed solution of 15ml of ethanol and 2ml of glacial acetic acid, stir for 30min, then add the tetrabutyl titanate solution dropwise to the carbon nanotube suspension, stir for 2h, add dropwise 35 % ammonia water, adjust pH=9, react for 1h, and generate a sol. The product was centrifuged three times with ethanol, washed with distilled water and centrifuged five times, and...

Embodiment 2

[0038] 0.4g of carbon nanotubes were sintered at 500°C for 30min, then dispersed in a mixed solution of 30ml of concentrated nitric acid and 10ml of concentrated sulfuric acid, heated to 70°C, sonicated for 3h, then washed with distilled water and centrifuged for 5 times until neutral, suction filtered . The morphology of carbon nanotubes before and after purification is as follows figure 1 and figure 2 shown. The purified carbon nanotubes were mixed with 20 ml of 5% sodium dodecylbenzenesulfonate and sonicated for 4 h, and ethanol was added and stirred for 30 min. Dissolve 7.4074g of tetrabutyl titanate in a mixed solution of 15ml of ethanol and 2ml of glacial acetic acid, stir for 30min, then add the tetrabutyl titanate solution dropwise to the carbon nanotube suspension, stir for 2h, add dropwise 35 % ammonia water, adjust pH=9, react for 1h, and generate a sol. The product was centrifuged three times with ethanol, washed with distilled water and centrifuged five times...

Embodiment 3

[0040] 0.4g of carbon nanotubes were sintered at 500°C for 30min, then dispersed in a mixed solution of 30ml of concentrated nitric acid and 10ml of concentrated sulfuric acid, heated to 70°C, sonicated for 3h, then washed with distilled water and centrifuged for 5 times until neutral, suction filtered . The morphology of carbon nanotubes before and after purification is as follows figure 1 and figure 2 shown. The purified carbon nanotubes were mixed with 20 ml of 5% sodium dodecylbenzenesulfonate and sonicated for 4 h, and ethanol was added and stirred for 30 min. Dissolve 7.4074g of tetrabutyl titanate in a mixed solution of 15ml of ethanol and 2ml of glacial acetic acid, stir for 30min, then add the tetrabutyl titanate solution dropwise to the carbon nanotube suspension, stir for 2h, add dropwise 35 % ammonia water, adjust pH=9, react for 1h, and generate a sol. The product was centrifuged three times with ethanol, washed with distilled water and centrifuged five times...

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Abstract

The invention discloses a lithium ion-type supercapacitor ternary composite negative electrode material and a preparation method thereof. The composite material is formed by strontium-doped lanthanum manganate, lithium titanate and a carbon nano-tube, wherein the mass ratio of the strontium-doped lanthanum manganate to the lithium titanate to the carbon nano-tube is 10:80:10 to 5:90:5. The composite material preparation method comprises steps: a sol-gel method is firstly adopted to coat the surface of the carbon nano-tube with a layer of titanium dioxide, lithium salt is then introduced via a dipping method, and a lithium titanate / carbon nano-tube composite material is thus generated; and a sol containing lanthanum ions, strontium ions and manganese ions is used for dipping, a perovskite-type strontium-doped lanthanum manganate thin film is formed on the surface of the lithium titanate coating surface through high-temperature treatment, and thus a strontium-doped lanthanum manganate / lithium titanate / carbon nano-tube composite material is obtained. The prepared ternary composite material of the invention has high conductive performance and can be used to serve as the negative electrode material for the lithium ion-type supercapacitor, and the specific capacity can reach 153mAh / g at the rate of 10C.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a strontium-doped lanthanum manganate / lithium titanate / carbon nanotube ternary composite material and a preparation method thereof. Background technique [0002] Hybrid supercapacitors have the advantages of high specific power of electric double layer supercapacitors and high specific energy of secondary batteries. They are expected to replace traditional batteries and have been widely used in many fields. In particular, hybrid capacitors have broad application prospects as power sources for electronic devices and electric vehicles due to their unique advantages of high specific energy, fast charging and discharging, and long cycle life. [0003] Around 1999, people began to conduct a lot of research on lithium titanate as a negative electrode material for lithium-ion secondary batteries. The potential of lithium titanate relative to the lithium electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/86
CPCY02E60/13H01G11/50H01G11/86
Inventor 阎景旺李然高兆辉姜靓
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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