Spinel-Type Lithium Titanium Oxide/Graphene Composite and Method of Preparing the Same

a lithium titanium oxide and graphene technology, applied in the field of spinel-type lithium titanium oxide/graphene composite and the field of preparing the same, can solve the problems of affecting the electrical conductivity of the cell, the inability to use a high specific surface area of single-layer graphene, and the inability to form a uniform complex structure,

Inactive Publication Date: 2012-05-03
IND ACADEMIC CORP FOUND YONSEI UNIV
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  • Abstract
  • Description
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Benefits of technology

[0010]The present invention is directed to providing a method capable of manufacturing a lithium titanium oxide/graphene composite without performing a subsequent process of removing oxygen functional groups from a sur...

Problems solved by technology

However, graphene is not easily peeled even when it is in a solution phase because of the van der Waals's interaction between graphene layers due to the presence of sp2 carbon bonds on a surface of the graphene.
Therefore, when a complex material with a transition metal oxide is synthesized in a solution phase using graphene as a precursor, it is difficult to use a high specific surface area of single layer graphene and to form a uniform complex structure, which serves as a factor preventing the use of the transition metal oxide.
However, since the various oxygen functional groups introduced into the surface...

Method used

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  • Spinel-Type Lithium Titanium Oxide/Graphene Composite and Method of Preparing the Same
  • Spinel-Type Lithium Titanium Oxide/Graphene Composite and Method of Preparing the Same
  • Spinel-Type Lithium Titanium Oxide/Graphene Composite and Method of Preparing the Same

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example 1

Preparation of Li4Ti5O12 / Reducted Graphite Oxide Nanocomposite

[0083]A spinel-type Li4Ti5O12 nanoplatelet / reduced graphite oxide (RGO) nanocomposite was synthesized using a two-step microwave associated solvothermal reaction and post heat treatment.

[0084]First, the TiO2 / RGO nanocomposite was synthesized from graphite oxide (GO) prepared from pure natural graphite powder (SP-1, 200 mesh, Bay Carbon) according to a modified Hummers method. GO powder (0.1 g) was sonicated in diethylene glycol (70 ml) (DEG, >99%, Fluka) for 30 minutes, and titanium ethoxide (0.015 ml) (Aldrich) and distilled water (5 ml) were added to the resulting solution. A 100-ml Teflon vessel was loaded with the mixed solution, and sealed. Then, the resulting mixed solution was placed in a microwave digestion system (MARS-5, CEM Corporation). The reaction mixture was heated to 210° C., and maintained at this temperature for 30 minutes. When the reaction was completed, a resulting powder (TiO2 / RGO nanocomposite) was ...

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Abstract

A spinel-type lithium titanium oxide/graphene composite and a method of preparing the same are provided. The method can be useful in simplifying a manufacturing process and shortening a manufacturing time using microwave associated solvothermal reaction and post heat treatment, and the spinel-type lithium titanium oxide/graphene composite may have high electrochemical performances due to its excellent capacity and rate capability and long lifespan, and thus be used as an electrode material of the lithium secondary battery.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Korean Patent Application No. 2010-0106929, filed Oct. 29, 2010, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to a spinel-type lithium titanium oxide (Li4Ti5O12) / reduced graphite oxide (graphene) composite and a method of preparing the same, and more particularly, to a method of preparing a spinel lithium titanium oxide / graphene composite having excellent electrochemical properties capable of simplifying a manufacturing process and shortening a manufacturing time using microwave associated solvothermal reaction and post heat treatment.[0004]2. Discussion of Related Art[0005]Graphene is a carbon structure composed of a two-dimensional (2-D) nanosheet single layer in which sp2 carbon atoms are formed into a hexagonal honeycomb lattice. Since graphene was separated from graphite usi...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01B1/18H01M4/04B82B3/00B82Y99/00
CPCB82Y30/00C01P2004/04C01G23/005C01P2002/32C01P2002/72C01P2002/82C01P2004/64C01P2006/40H01B1/18H01M4/364H01M4/485H01M4/587H01M10/052C01B31/0476Y02E60/122B82Y40/00C01B32/192Y02E60/10B01J19/126H01M4/04
Inventor KIM, KWANG BUMKIM, HYUN KYUNGKIM, JI YOUNG
Owner IND ACADEMIC CORP FOUND YONSEI UNIV
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