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Pre-lithiated graphene as well as preparation method and application thereof

A graphene negative electrode and fossil technology, applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of battery fire and explosion, low current density, and large time loss, and achieve reduced lithium loss and high rate Performance, efficiency-enhancing effects

Inactive Publication Date: 2021-10-22
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some defects in the previous pre-lithiation method: (1) the electrochemical pre-lithiation has a large time loss due to the low current density; (2) the electrical overload may cause the battery to catch fire and explode during the process; (3) the use of bulk lithium for pre-lithiation Lithiation efficiency is low

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  • Pre-lithiated graphene as well as preparation method and application thereof
  • Pre-lithiated graphene as well as preparation method and application thereof
  • Pre-lithiated graphene as well as preparation method and application thereof

Examples

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Embodiment 1

[0049] The pre-lithiated graphene of the present embodiment comprises the following components: LiO 2 , Li 2 CO 3 , LiC x , R-Li, where R is reduced graphene oxide, 1 / 6≤x≤1; the specific surface area of ​​pre-lithiated graphene is 81.18m 2 g -1 , the reversible specific capacity of pre-lithiated graphene is 540mAh g -1 .

[0050] Different mass ratios of lithium and graphene oxide lead to different contents of lithium carbide produced by the reaction, resulting in different reversible specific capacities. In addition, pre-lithiation and reduction of graphene oxide are completed simultaneously. Different Li ratios lead to different reduction degrees and different defects. , so that the specific surface area is different.

[0051] The preparation method of the pre-lithiated graphene of the present embodiment comprises the following steps:

[0052] Weigh lithium metal and graphene oxide with a mass ratio of 2wt% and put them into a container, then add tert-butylbenzene an...

Embodiment 2

[0061] The pre-lithiated graphene of the present embodiment comprises the following components: LiO 2 , Li 2 CO 3 , LiC x , R-Li, where R is reduced graphene oxide, 1 / 6≤x≤1; the specific surface area of ​​pre-lithiated graphene is 103.21m 2 g -1 , the reversible specific capacity of pre-lithiated graphene is 651mAh g -1 .

[0062] The preparation method of the pre-lithiated graphene of the present embodiment comprises the following steps:

[0063] Weigh lithium metal and graphene oxide with a mass ratio of 4wt% and put them into a container, then add tert-butylbenzene and tert-butylbenzo to obtain a mixture, and pour N-methylpyrrolidone into the mixture in the container as a solvent , to obtain the slurry, pass nitrogen gas to remove the air in the beaker, magnetically stir the slurry, the rotation speed is 300rpm, the reaction temperature is 70°C, after stirring for 2h, the slurry is washed and filtered and placed in a vacuum drying oven at 80°C Vacuum drying for 15 h...

Embodiment 3

[0073] The pre-lithiated graphene of the present embodiment comprises the following components: LiO 2 , Li 2 CO 3 , LiC x , R-Li, where R is reduced graphene oxide, 1 / 6≤x≤1; the specific surface area of ​​pre-lithiated graphene is 94.7m 2 g -1 , the reversible specific capacity of pre-lithiated graphene is 572mAh g -1 .

[0074] The preparation method of the pre-lithiated graphene of the present embodiment comprises the following steps:

[0075] Weigh lithium metal and graphene oxide with a mass ratio of 6wt% and put them into a container, then add tert-butylbenzene and tert-butylbenzo to obtain a mixture, and pour N-methylpyrrolidone into the mixture in the container as a solvent , to obtain the slurry, pass nitrogen gas to remove the air in the beaker, magnetically stir the slurry, the rotation speed is 300rpm, the reaction temperature is 70°C, after stirring for 2h, the slurry is washed and filtered and placed in a vacuum drying oven at 80°C Vacuum drying for 15 hou...

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Abstract

The invention belongs to the technical field of battery materials, and discloses pre-lithiated graphene and a preparation method and application thereof, and the pre-lithiated graphene comprises the following components: lithium oxide and lithium carbide, wherein the carbides of lithium are Li2CO3, LiCx and R-Li, R is reduced graphene oxide, and x is more than or equal to 1 / 6 and less than or equal to 1. The pre-lithiated graphene is a compound of graphene and lithium and a compound of graphene and a lithium-containing compound. In the compound, a part of lithium is connected with graphene through ionic bonds, and a part of lithium can form other lithium-containing compounds which are uniformly distributed on the surface of a graphene and lithium film.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a pre-lithiated graphene and its preparation method and application. Background technique [0002] Graphene nanosheets have a huge impact on energy storage devices due to their unique structure, physical and electrical properties. Especially in terms of battery applications, graphene stands out among many carbon materials due to its ultra-high conductivity and large specific surface area. Although graphene has excellent electrochemical properties, the commercialization of graphene-based lithium-ion batteries has not been fully realized until now, due to the lack of large-scale synthetic methods to synthesize high-quality graphene. The current method of mass production of graphene commonly used is through the redox method. [0003] Generally, natural graphite is prepared as graphene oxide by the Hummers method. The reduction methods include thermal reduction, hydrothe...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 张振华李长东范霞毛林林阮丁山
Owner GUANGDONG BRUNP RECYCLING TECH
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