Lithium titanate graphene electrode and preparation method thereof

A technology of graphene electrodes and lithium titanate, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor bonding of graphene, and achieve the effects of improving electrode performance, promoting diffusion, and increasing conductivity

Pending Publication Date: 2022-07-08
ARMY ENG UNIV OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The second object of the present invention is to provide a preparation method of lithium titanate graphene electrode material, which effectively solves the agglomeration of graphene and its interaction with Li 4 Ti 5 o 12 The problem of poor integration

Method used

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  • Lithium titanate graphene electrode and preparation method thereof
  • Lithium titanate graphene electrode and preparation method thereof
  • Lithium titanate graphene electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] S1, Hummers method to prepare graphene oxide

[0075] ① First, the mass ratio of graphite and potassium peroxodisulfate was mixed according to 0.83:1 (6.0g graphite and 7.2g potassium peroxodisulfate) and slowly added to 276mL of concentrated H 2 SO 4 , and use magnetic stirring for 15min for standby;

[0076] ②Then slowly add 36g of strong oxidant potassium permanganate (KMnO 4 ), the control reaction temperature does not exceed 20 ℃;

[0077] ③ The mixture obtained above was stirred for 1.5h under ice bath conditions, then heated to 40°C and reacted at constant temperature for 6h to obtain a turquoise viscous solution. 4L deionized water;

[0078] ④ Then add a certain amount of H 2 O 2 The solution was stirred for 5 min until no more bubbles were formed. Finally, the mixed solution is centrifuged and washed until the pH is close to about 5.0 to obtain graphene oxide, which is then freeze-dried to obtain graphene oxide powder. Process such as Figure 4 shown. ...

Embodiment 2

[0086] The ball milling time was 3h, and other parameters and steps were the same as those in Example 1.

Embodiment 3

[0088] The ball milling time was 4h, and other parameters and steps were the same as those in Example 1.

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Abstract

The invention relates to the technical field of lithium ion battery electrode materials, in particular to a lithium titanate graphene electrode and a preparation method thereof, the electrode material is a composite electrode material generated by a hydrothermal reaction of lithium titanate and graphene oxide, and the lithium titanate is Li4Ti5O12; wherein the mass ratio of the Li4Ti5O12 to the graphene oxide is (70 to 90): (10 to 30). The lithium titanate/graphene (LTO/G) composite electrode material which is uniformly compounded and tightly combined is prepared by taking graphene oxide as a reinforcing body and Li4Ti5O12 as a raw material through a hydrothermal synthesis process. Li4Ti5O12 and graphene are compounded, so that direct contact between a negative electrode and an electrolyte can be avoided, the compatibility between the electrolyte and the negative electrode is improved, the conductivity of Li4Ti5O12 can be increased, more embedded lithium sites are provided, and the irreversible capacity is reduced; meanwhile, the introduction of the graphene can promote the diffusion of lithium ions and reduce the impedance of the SEI film, so that the high/low temperature performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, in particular to a lithium titanate graphene electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic products, electric vehicles, and field power supplies due to their high energy density, high operating voltage, and no memory effect. Lithium-ion batteries are usually used at room temperature, and the working environment generally does not exceed 40 °C, which is conducive to the development of electrode materials and performance. However, with the needs of electric vehicles, aerospace, and polar combat readiness, lithium-ion batteries with excellent performance at high and low temperatures will become an inevitable development requirement. However, when the lithium-ion battery is used at high temperature or low temperature, there are problems such as low capacity, poor rate performance, poor cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/366H01M10/0525H01M4/625H01M4/485B82Y40/00B82Y30/00H01M2004/027Y02P70/50
Inventor 孙海涛刘亮殷军辉邓辉咏齐子元崔凯波赵玉龙蒋有才郭德卿俞文文薛德庆张飒
Owner ARMY ENG UNIV OF PLA
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