Lithium titanate/carbon/carbon nano tube composite electrode material and preparation method thereof

A technology of carbon nanotubes and composite electrodes, which can be used in battery electrodes, circuits, capacitors, etc., and can solve problems such as poor conductivity

Active Publication Date: 2010-09-22
浙江泛贝网络科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to prepare a lithium titanate / carbon / carbon nanotube composite electrode material to solve the problem of spinel Li 4 Ti 5 o 12 The problem of poor conductivity, so as to obtain lithium titanate composite electrode materials with high rate performance

Method used

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  • Lithium titanate/carbon/carbon nano tube composite electrode material and preparation method thereof
  • Lithium titanate/carbon/carbon nano tube composite electrode material and preparation method thereof
  • Lithium titanate/carbon/carbon nano tube composite electrode material and preparation method thereof

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Embodiment 1

[0027] Weigh 4.0gCH 3 COOLi.2H2 O was placed in a beaker, and about 20ml of deionized water was added to prepare solution A with a concentration of about 2mol / L. Then weigh 0.14g of carbon nanotubes and 0.035g of PVP and put them into another beaker, add about 150ml of deionized water and undergo sufficient ultrasonic treatment to obtain solution B. Add solution A dropwise to solution B under stirring conditions to prepare a new mixed solution C. Weigh a certain amount of anatase titanium dioxide according to the ratio of lithium to titanium molar ratio of 4:5 and add it to the above mixed solution C. The solution C is stirred at 80°C until dry, ground, and heat-treated at 800°C for 12 hours in an inert atmosphere. A spinel lithium titanate / carbon nanotube composite was obtained. Weigh 0.80g of the sample, mix the sample powder, acetylene black and LA-132 at a ratio of 85:10:5 to make an electrode sheet, which is used as a positive electrode after vacuum drying, and a lithiu...

Embodiment 2

[0029] Weigh 4.0gCH 3 COOLi.2H 2 O was placed in a beaker, and about 20ml of deionized water was added to prepare solution A with a concentration of about 2mol / L. Then weighed 0.24g of carbon nanotubes and 0.06g of PVP and put them into another beaker, added about 150ml of deionized water and underwent sufficient ultrasonic treatment to obtain solution B. Add solution A dropwise to solution B under stirring conditions to prepare a new mixed solution C. Weigh a certain amount of anatase titanium dioxide according to the ratio of lithium to titanium molar ratio of 4:5 and add it to the above mixed solution C. The solution C is stirred at 80°C until dry, ground, and heat-treated at 800°C for 12 hours in an inert atmosphere. A spinel lithium titanate / carbon nanotube composite was obtained. Weigh 0.80g of the sample, mix the sample powder, acetylene black and LA-132 at a ratio of 8.5:1:0.5 to make an electrode sheet, which is used as a positive electrode after vacuum drying, and...

Embodiment 3

[0031] Weigh 4.0gCH 3 COOLi.2H 2 O was placed in a beaker, and about 20ml of secondary deionized water was added to prepare solution A with a concentration of about 2mol / L. Then weigh 0.14g of carbon nanotubes and 0.035g of PVP respectively and put them into another beaker, add about 150ml of secondary deionized water and undergo sufficient ultrasonic treatment to obtain solution B. Add solution A dropwise to solution B under stirring conditions to prepare a new mixed solution C. Weigh a certain amount of anatase titanium dioxide according to the ratio of lithium to titanium molar ratio of 4:5 and add it to the above mixed solution C. The solution C is stirred at 80°C until dry, ground, and heat-treated at 800°C for 12 hours in an inert atmosphere. A spinel lithium titanate / carbon nanotube composite was obtained. Weigh 2.0g of the above product, dissolve it in a solution containing 0.2g sucrose, stir it at 70-80°C to dryness, grind it, and heat it at 800°C for 2 hours in an...

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Abstract

The invention discloses a lithium titanate/carbon/carbon nano tube composite electrode material and a preparation method thereof. The composite electrode material consists of lithium titanate, wrapped carbon and carbon nano tube in mass ratio of 90-97: 0-5: 3-5. Lithium-containing compound, anatase titanium dioxide and carbon nano tube are used as raw materials, and the method comprises the following steps of: preparing a lithium titanate/carbon nano tube composite by a wet chemistry method, then wrapping the obtained lithium titanate/carbon nano tube composite by adopting an organic substance, and finally thermally treating the wrapped composite under an inert atmosphere to obtain the lithium titanate/carbon/carbon nano tube composite electrode material. The lithium titanate/carbon/carbon nano tube composite electrode material has the characteristics of high multiplying power, high specific capacity and long service life.

Description

technical field [0001] The invention relates to an electrode material lithium titanate composite for lithium ion batteries or supercapacitors and a preparation method thereof, belonging to the fields of energy and new materials. Background technique [0002] As a new type of lithium-ion battery anode material, spinel lithium titanate (Li 4 Ti 5 o 12 ) has attracted widespread attention due to its unique performance characteristics, and is considered to be one of the anode materials that may replace the current commercial carbon materials. The material has the following characteristics: high potential (1.55V vs Li), does not react with common electrolytes during work, and has good safety performance; the so-called "zero-strain" electrode material is a crystal of the material during the insertion or extraction of lithium ions The structure hardly changes and theoretically has infinite cycle life. In addition, Li 4 Ti 5 o 12 It also has the characteristics of anti-overch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/1391H01G9/042
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 李星瞿美臻于作龙
Owner 浙江泛贝网络科技有限公司
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