Preparation method for three-dimensional porous graphene doping and coating lithium titanate composite anode material

A three-dimensional porous technology for coating lithium titanate, applied in electrode manufacturing, battery electrodes, electrical components, etc., can solve problems such as poor conductivity of lithium titanate, and achieve the effect of improving conductivity, high specific capacity, and low cost

Inactive Publication Date: 2012-08-22
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a preparation method of a three-dimensional porous graphene doped and coated lithium titanate composite negative elec

Method used

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  • Preparation method for three-dimensional porous graphene doping and coating lithium titanate composite anode material
  • Preparation method for three-dimensional porous graphene doping and coating lithium titanate composite anode material
  • Preparation method for three-dimensional porous graphene doping and coating lithium titanate composite anode material

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Embodiment 1

[0017] Example 1: A method for preparing a three-dimensional porous graphene-doped and coated lithium titanate composite negative electrode material, comprising the following steps: (1) preparing a 5 mg / mL graphene oxide aqueous solution, adding 40 mL of 5 mg / mL The graphene oxide aqueous solution was poured into 50 mL polytetrafluoroethylene as the stainless steel reactor of the liner, the stainless steel reactor was sealed and placed in a blast drying oven, and reacted for 20 hours at 180 ° C, and then the stainless steel reactor was Naturally cool to room temperature, use filter paper to absorb the water in the solution until dry, and place the obtained powder in a vacuum drying oven to fully dry to obtain a three-dimensional porous graphene material. The specific surface of three-dimensional porous graphene material is at 2000 m 2 g ?1 . figure 1 is the scanning electron micrograph of the prepared three-dimensional porous graphene;

[0018] (2) Disperse three-dimension...

Embodiment 2

[0022] Example 2: A method for preparing a three-dimensional porous graphene-doped and coated lithium titanate composite negative electrode material, comprising the following steps: (1) preparing a 2 mg / mL graphene oxide aqueous solution, adding 40 mL of 2 mg / mL The graphene oxide aqueous solution was poured into a 50 mL polytetrafluoroethylene-lined stainless steel reactor, sealed and placed in a blast drying oven at 120 ° C for 12 hours, then the reactor was naturally cooled to room temperature, and The filter paper absorbs the water in the solution until dry, and the obtained powder is fully dried in a vacuum drying oven to obtain a three-dimensional porous graphene material. The specific surface of three-dimensional porous graphene material is at 2300 m 2 g ?1 ;

[0023] (2) Disperse three-dimensional porous graphene in methanol to prepare a three-dimensional porous graphene solution with a concentration of 2 mg / mL;

[0024] (3) Take 9.60 g of anatase titanium dioxide ...

Embodiment 3

[0026] Embodiment 3: A preparation method of a three-dimensional porous graphene doped and coated lithium titanate composite negative electrode material, comprising the following steps:

[0027] (1) Prepare 8 mg / mL graphene oxide aqueous solution, pour 40 mL 8 mg / mL graphene oxide aqueous solution into a 50 mL stainless steel reaction kettle with polytetrafluoroethylene as the liner, and seal it in a blast drying oven React at 150°C for 16 hours, then cool the reactor to room temperature naturally, absorb the moisture in the solution with filter paper until dry, and place the obtained powder in a vacuum drying oven to fully dry to obtain a three-dimensional porous graphene material. The specific surface of three-dimensional porous graphene material is at 1850 m 2 g ?1 ;

[0028] (2) Disperse three-dimensional porous graphene in ethanol to prepare a three-dimensional porous graphene solution with a concentration of 5 mg / mL;

[0029] (3) Take 0.9078 g of anhydrous lithium oxal...

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Abstract

The invention discloses a preparation method for a three-dimensional porous graphene doping and coating lithium titanate composite anode material. The problem that a high ratio property of lithium titanate is poor can be solved by a doping vario-property of a carbon nano material to the lithium titanate, and the spinel structure of the lithium titanate can not be affected. A nano carbon layer made of the carbon nano material is doped in a carbon nano material doping lithium titanate composite material to have an effect of an electrical transmission cushion layer, so that a cyclic property of the carbon nano material doping lithium titanate composite material is improved, besides, an introduction of the carbon nano material can effectively restrain a gathering of lithium titanate particles in a heat treatment process, and simultaneously diffusion coefficients of lithium-ions in the carbon nano material doping lithium titanate composite material are increased. According to the preparation method for the three-dimensional porous graphene doping and coating lithium titanate composite anode material, the prepared three-dimensional porous grapheme has a high specific surface area, and thereby the high ratio property of the lithium titanate is further improved.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method of a three-dimensional porous graphene doped and coated lithium titanate composite negative electrode material. Background technique [0002] As a new generation of green high-energy battery with excellent performance, lithium-ion battery has the remarkable characteristics of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. The current lithium-ion battery electrode material is mainly LiCoO 2 , LiNiO 2 and LiMn 2 o 4 wait. The Co system is highly toxic, the synthesis conditions of the Ni system are harsh, and the Jahn-Teller effect cycle performance of the Mn system is not good. LiFePO 4 It is recognized as one of the more promising positive electrode materials in the next generation of lithium-ion batteries. However, the safety of the negative el...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1391H01M4/62
CPCY02E60/10
Inventor 田小宁蒋仲庆蒋仲杰陈巍衡罗利娟
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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