Li4Ti5O12/ grapheme composite electrode material and preparation method thereof

A graphene composite and electrode material technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, battery electrodes, etc., to achieve the effects of inhibiting agglomeration, excellent battery capacity, and low cost

Inactive Publication Date: 2013-07-24
HEFEI UNIV OF TECH
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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 solve Li 4 Ti 5 o 12 / The homogeneity problem in the in-situ solid-phase synthesis of graphene electrode material, provide a kind of Li that can be prepared with good uniformity 4 Ti 5 o 12 / In-situ solid-phase synthesis method of graphene composite electrode materials

Method used

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  • Li4Ti5O12/ grapheme composite electrode material and preparation method thereof
  • Li4Ti5O12/ grapheme composite electrode material and preparation method thereof
  • Li4Ti5O12/ grapheme composite electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 1) Carbon coating of titanium dioxide

[0046] Weigh 0.3454g glucose and 1.3699gTiO by mass ratio 1:4 2 Nano-powder, first dissolve glucose in 50ml (water: ethanol = 1:5) mixture of water and ethanol, add TiO 2 Add the nanometer powder into the glucose solution, stir vigorously for 2 hours, at 110 o C in a forced air oven to dry. Dry the product at 600 o Calcined in C nitrogen atmosphere for 5h to obtain black carbon-coated TiO 2 Nano powder.

[0047] 2) Preparation of graphene

[0048] Mix 2.004g of natural flake graphite and 2.0064g of sodium nitrate, add 110ml of concentrated sulfuric acid solution, stir in an ice-water bath for 15 minutes, then slowly add 12.0728g of potassium permanganate into the solution, react in an ice-water bath for 0.5h, and then After continuous stirring for 48 hours, add 184ml of deionized water, 40ml of hydrogen peroxide (30%wt) for 20 minutes, and centrifuge. The isolated product was washed with a mixed solution of sulfuric acid an...

Embodiment 2

[0055] Repeat Example 1, the difference is that the carbon source in step 1) is sucrose, according to sucrose and TiO 2 The mass ratio of nano-powder is 1:4 and 0.3454g sucrose is weighed. In step 3), 0.0672g graphene is weighed according to the proportion of graphene accounting for 5%wt of the total composite material, and cyclohexane is used as a dispersant, and the planetary ball mill is used for 5h , the speed is 300 rpm. The first reversible capacity of the material in this example is 183 mAh / g at 0.2C, and the capacity after 100 cycles at 1C rate is 169 mAh / g.

Embodiment 3

[0057] Repeat Example 1, the difference is that the carbon source in step 1) is sucrose, according to sucrose and TiO 2 The mass ratio of nanopowder is 1:4 and 0.3454g sucrose is weighed. In step 3), 0.1418g graphene is weighed according to the proportion of graphene accounting for 10%wt of the total composite material, and cyclohexane is used as a dispersant, and planetary ball milling is carried out for 5h , the speed is 300 rpm.

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Abstract

The invention relates to a Li4Ti5O12/ grapheme composite electrode material, which is prepared by combining the following components: carbon-coated titanium dioxide, grapheme and a lithium source, wherein in a mixture of the carbon-coated titanium dioxide and the lithium source, the molar ratio of lithium to titanium is 0.8-0.88:1; and the grapheme accounts for 1.0 percent-15 percent of the total weight of lithium titanate/grapheme composite electrode materials. The invention also provides a preparation method of the composite electrode material. The method comprises the following steps of: on the basis of coating carbon on raw material nano TiO2, compositing the lithium source and the grapheme with the TiO2 through ball-milling; and preparing the composite electrode material under inert atmosphere through an in-situ solid-phase reaction method. According to the method, the agglomeration of Li4Ti5O12 at high temperature is effectively inhibited, the combination between the coated carbon layer and the grapheme is closer, and the stable and uniform composite material is formed. Tests show that the composite material has favorable electrochemical performance when being used as the electrode material of a lithium ion battery and a supercapacitor, is an ideal electrode material for the lithium ion battery and the supercapacitor, has simple combination process, and is easy to produce in large scale.

Description

technical field [0001] The invention relates to the field of electrode materials for lithium ion batteries and supercapacitors, in particular to a Li 4 Ti 5 o 12 The invention relates to a graphene composite electrode material and a preparation method thereof, especially a synthesis method for high-rate lithium-ion batteries and lithium-ion supercapacitor electrode materials, belonging to the field of new energy materials. Background technique [0002] As a new type of energy storage element, supercapacitor has the characteristics of small size, large capacity, no breakdown due to overvoltage, and long service life. At present, the research focus of lithium-ion power battery materials is also developing in the direction of high specific capacity, large rate, high cycle performance and high safety performance. In terms of negative electrodes, widely used electrode materials are carbon-based materials. Although carbon anodes have been successfully commercialized, they have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/32H01M4/36H01M4/485
CPCY02E60/10
Inventor 项宏发郭鑫周天培
Owner HEFEI UNIV OF TECH
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