Ternary multilevel multi-dimensional structure composite material and preparation method thereof

A composite material and multi-dimensional technology, applied in the field of energy materials, can solve the problems of insufficient, uneven, and low electrical conductivity, and achieve the effects of outstanding safety, excellent cycle performance, and good electrical conductivity

Active Publication Date: 2015-01-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene oxide (GO) has extremely low conductivity, while the conductivity of chemically modified graphene (CCG) is neither sufficient nor uniform compared to that of pristine graphene (PG).

Method used

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  • Ternary multilevel multi-dimensional structure composite material and preparation method thereof
  • Ternary multilevel multi-dimensional structure composite material and preparation method thereof
  • Ternary multilevel multi-dimensional structure composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] For Nano TiO 2 Defects in terms of low specific capacity and low conductivity, via the secondary phase high specific capacity metal oxide Fe 3 o 4 (927mA h g -1 ) and the co-doping of high-conductivity pristine graphene components, this embodiment provides a kind of ternary multi-level multi-dimensional structure TiO 2 Nanorod-Fe 3 o 4 The nanoparticle-pristine graphene nanosheet composite material, using its outstanding synergistic effect and unique multi-level multi-dimensional structure, exerts excellent comprehensive electrochemical performance.

[0029] The ternary multilevel multidimensional structure TiO provided by this embodiment 2 Nanorod-Fe 3 o 4 Nanoparticle-pristine graphene nanosheet composites made of TiO 2 , Fe 3 o 4 A ternary heterostructure with a molar ratio of 4:2:4 and three components of pristine graphene with high conductivity, the preparation method is as follows:

[0030] (1) Add natural graphite powder to N-methyl-2-pyrrolidone (NMP)...

Embodiment 2

[0036] The difference between this embodiment and Example 1 is: Step (3): 35 grams of oleic acid was added to a 50 ml three-necked bottle connected with a reflux cooler, and dried at 120° C. for 1 hour under vigorous stirring, Cool to 80-100°C in the stream. Then 1 mmol of titanium tetraisopropoxide was added to oleic acid and stirred for 5 minutes to make the solution change from white to pale yellow. Dissolve 10mmol hydroxylated tetrabutylammonium in 2mL water, suck it into the syringe, and then quickly inject it into the mixed solution, keep the solution at 80-100°C, and stir for 8 hours under mild water reflux conditions, then stop heating, Water was removed under vacuum to give a clear solution. Add 20 mL of ethanol to the above solution to obtain a precipitate, wash it twice with ethanol after centrifugation, and dry it in vacuum at 40 °C for 12 hours to obtain TiO 2 Nano stave. The dried TiO 2 The nanoparticles were dissolved in THF to give a milky white solution at...

Embodiment 3

[0038] For Nano TiO 2 Defects in terms of low specific capacity and low conductivity, through the secondary phase high specific capacity metal oxide Co 3 o 4 (891mA h g -1 ) and the co-doping of high-conductivity pristine graphene components, this embodiment provides a kind of ternary multi-level multi-dimensional structure TiO 2 Nanoparticles-Co 3 o 4 The nanoribbon-pristine graphene nanosheet composite material, using its outstanding synergistic effect and unique multi-level multi-dimensional structure, exerts excellent comprehensive electrochemical performance.

[0039] The ternary multilevel multidimensional structure TiO in this embodiment 2 Nanoparticles-Co 3 o 4 Nanobelt-pristine graphene nanosheet composites made of TiO 2 、Co 3 o 4 A ternary heterostructure with a molar ratio of 3:3:4 and three components of pristine graphene with high conductivity, its preparation method is as follows:

[0040] (1) Add natural graphite powder to N-methyl-2-pyrrolidone (NMP)...

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Abstract

The invention discloses a ternary multilevel multi-dimensional structure composite material and a preparation method thereof. The excellent electrochemical comprehensive performance can be exerted by utilizing the remarkable synergistic effect and unique multilevel multi-dimensional structure. The composite material is formed by TiO2 of a low-dimensional nano structure and second-phase high-specific-capacity metal oxide as well as two-dimensional micrometer (x-y plane direction) high-conductivity plain graphene. Drive force for lowering the total surface free energy of the solution system is utilized to uniformly load and compactly combine TiO2 of the nano structure and high-specific-capacity metal oxide to an exposed surface of the plain graphene nanosheet by virtue of a tetrahydrofuran solution mixing method. The ternary multilevel multi-dimensional structure composite material effectively integrates the remarkable function of each ingredient, including excellent circulating property and outstanding safety of TiO2, high specific capacity of the second-phase metal oxide, and good conductivity of the plain graphene.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to a ternary multilevel multidimensional structure TiO 2 -High specific capacity metal oxide-pristine graphene composite material and preparation method thereof. Background technique [0002] The over-exploitation of fossil resources by humans has brought serious energy crisis and environmental pollution, which has triggered the vigorous development of electric vehicles, which requires the development of lithium-ion batteries to higher energy density and power density. However, graphite, the current commercial anode material for lithium-ion batteries, not only has a low specific capacity, but also has a low lithium intercalation potential that may easily cause serious safety problems, which is far from meeting the needs of the next generation of high-performance lithium-ion batteries. Therefore, the search for anode alternative materials with higher electrochemical performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587
CPCH01M4/364H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 朱晓东王可心孙克宁马汝甲闫杜娟乐士儒
Owner HARBIN INST OF TECH
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