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Lithium ion battery negative material Li4Ti5O12 / TiO2 / RGO and preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., to achieve good electrochemical performance, increase specific surface area, and high specific capacity.

Active Publication Date: 2016-08-10
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, regarding lithium battery anode materials Li 4 Ti 5 o 12 / TiO 2 There are few reports about / RGO

Method used

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  • Lithium ion battery negative material Li4Ti5O12 / TiO2 / RGO and preparation method thereof
  • Lithium ion battery negative material Li4Ti5O12 / TiO2 / RGO and preparation method thereof
  • Lithium ion battery negative material Li4Ti5O12 / TiO2 / RGO and preparation method thereof

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preparation example Construction

[0024] In order to further improve the application range of lithium-ion battery negative electrode materials and the problems of complex preparation process and difficult control in the preparation method, this embodiment provides a lithium-ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 The simple preparation method of / RGO comprises the following steps:

[0025] 1) Using high-purity graphite as raw material, graphene oxide (GO) was prepared by the improved Hummers method. Subsequently, 30ml 30%HI / H 2 O solution was added to 10ml graphene oxide suspension (2.5mg·ml -1 ), stirred and reacted at 70°C for 1 h; subsequently, washed three times with deionized water and absolute ethanol, and dried in vacuum at 70°C to obtain the intermediate product reduced graphene oxide (RGO).

[0026] 2) At room temperature, take an appropriate amount of tetrabutyl titanate (TBT) and RGO powder in absolute ethanol, stir and mix thoroughly for 1 h; then CH 3 COOLi·2H 2 O was ...

Embodiment 1

[0036] Embodiment 1 A kind of lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / RGO

[0037] Follow the steps below to prepare:

[0038] 1) Using high-purity graphite as raw material, graphene oxide (GO) was prepared by the modified Hummers method. Subsequently, 30% HI / H 2 O solution was added to the graphene oxide suspension (2.5mg·ml -1 ), stirred and reacted at 70°C for 1 h; subsequently, washed three times with deionized water and absolute ethanol, and dried in vacuum at 70°C to obtain the intermediate product reduced graphene oxide (RGO).

[0039] 2) At room temperature, take an appropriate amount of tetrabutyl titanate (TBT) and RGO powder in absolute ethanol, stir and mix thoroughly for 1 h; then CH 3 COOLi·2H 2 O was dissolved in an appropriate amount of deionized water, fully dissolved, added to the above solution, and reacted for 10-12 hours under dry conditions to obtain a mixed reaction solution, and CH 3 COOLi·2H 2 The two raw materi...

Embodiment 2

[0042] Embodiment 2 A kind of lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / RGO

[0043] Only change the calcining temperature in step 4) of Example 1: calcining at 590-600°C.

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Abstract

The invention provides a lithium ion battery negative material Li4Ti5O12 / TiO2 / RGO and a preparation method thereof. The method adopts hydrothermal synthesis and further calcination process, uses TBT, RGO and CH3COOLi.2H2O as raw materials, adopts ethanol as a solvent, and conducts thermal reaction to prepare a precursor; and subsequently, the precursor is calcined at a high temperature in an air atmosphere to obtain a target product. The lithium ion battery negative material prepared by the method comprises a main body of a RGO thin layer loaded with LTO / TiO2 nanoparticles, maintains the excellent performance of the main body LTO and utilizes the characteristics of high specific capacity and good stability of TiO2; and the addition of the RGO with good conductive property can effectively reduce the agglomeration phenomenon among nanoparticles, increase the specific surface area of the material, and provide more channels of diffusion for the lithium ions, thereby enhancing the overall electronic conductivity of material. The invention has great prospects of application.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and in particular provides a lithium ion battery negative electrode material Li 4 Ti 5 o 12 / TiO 2 / RGO and its preparation method. Background technique [0002] At present, small lithium-ion batteries with carbonaceous materials as negative electrodes have been widely used in small digital products such as mobile phones, digital cameras, and notebook computers. , The irreversible components of lithium ions increase rapidly, which not only affects the service life of the battery, but more seriously, it is easy to cause safety problems such as combustion and explosion. Therefore, it is urgent to explore a lithium battery anode material with high safety performance and excellent electrochemical performance, and spinel Li 4 Ti 5 o 12 (LTO) due to its stable and high operating voltage (1.55V, vs Li + / Li) and zero volume change during charging and discharging, so it has become o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/48H01M4/485H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 葛昊崔潞霞郝婷婷陈丽宋溪明
Owner LIAONING UNIVERSITY
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