Preparation method of positive electrode material of lithium sulfur battery

A cathode material, a technology for lithium-sulfur batteries, applied in the field of electrodes, can solve the problems of low active material loading and utilization rate, poor electrochemical performance of lithium-sulfur batteries, and low sulfur loading content, etc., to achieve good electrical conductivity and enhance electrical conductivity. the effect of increasing the sulfur content

Active Publication Date: 2018-06-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the current technology and provide a method for preparing anode materials for lithium-sulfur batteries. In this method, graphene oxide, boric acid, urea and nano-sulfur powder are prepared by a simple spray drying process to prepare boron nitrogen oxide A method for co-doping graphene / sulfur composite three-dimensional structure lithium-sulfur battery positive electrode material, this positive electrode material overcomes the low and uneven sulfur loading content in the lithium-sulfur battery positive electrode material existing in the prior art, and the active material in the positive electrode material Both the loading capacity and the utilization rate are low, leading to the disadvantage of poor electrochemical performance of lithium-sulfur batteries

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  • Preparation method of positive electrode material of lithium sulfur battery

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Embodiment 1

[0021] The first step, the preparation of graphene oxide:

[0022] Graphene oxide was prepared by the Hummers method;

[0023] The second step is the preparation of boron, nitrogen and oxygen co-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0024]The graphene oxide, nano-sulfur powder, boric acid and urea prepared in the first step will be weighed according to the ratio of mass ratio 1:2:3:10 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 3: 1. Ball mill for 8 hours at a speed of 600 rpm to obtain a homogeneous mixture of the above four substances. According to the ratio of the mass ratio of the mixture to deionized water of 0.03:1, the mixture is added to deionized water to obtain a mixture Solution, use an ultrasonic disperser at room temperature to ultrasonically disperse the above mixture solution at 60kHz for 3 hours to obtain a suspension uniformly mixed with...

Embodiment 2

[0026] The first step, the preparation of graphene oxide:

[0027] Graphene oxide was prepared by the Hummers method;

[0028] The second step is the preparation of boron, nitrogen and oxygen co-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0029] The graphene oxide, nano-sulfur powder, boric acid and urea prepared in the first step will be weighed according to the ratio of mass ratio 1:4:3:10 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 3: 1. Ball mill at a speed of 600 rpm for 8 hours to obtain a homogeneous mixture of the above four substances. According to the ratio of the mass ratio of the mixture to deionized water of 0.03:1, the mixture is added to deionized water. Use an ultrasonic disperser at 60 kHz to ultrasonically disperse the mixture of graphene oxide, sulfur powder, boric acid, urea and deionized water for 3 hours to obtain a suspension that is uni...

Embodiment 3

[0031] The first step, the preparation of graphene oxide:

[0032] Graphene oxide was prepared by the Hummers method;

[0033] The second step is the preparation of boron, nitrogen and oxygen co-doped graphene / sulfur composite three-dimensional structure lithium-sulfur battery cathode material:

[0034] The graphene oxide, nano-sulfur powder, boric acid and urea prepared in the first step will be weighed according to the ratio of mass ratio 1:6:3:10 and placed in a ball mill jar, using a planetary ball mill, according to the ball-to-material ratio of 3: 1. Ball mill at a speed of 600 rpm for 8 hours to obtain a homogeneous mixture of the above four substances. According to the ratio of the mass ratio of the mixture to deionized water of 0.03:1, the mixture is added to deionized water. Use an ultrasonic disperser at 60 kHz to ultrasonically disperse the mixture of graphene oxide, sulfur powder, boric acid, urea and deionized water for 3 hours to obtain a suspension that is uni...

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium sulfur battery. The preparation method comprises the following steps of putting graphene oxide, nanometer sulfur powder, boric acid and urea into a ball milling tank, performing ball milling and then adding into deionized water to obtain a mixture solution, performing ultrasonic wave dispersion at a normal temperature for 1-3h to obtain a mixed suspension liquid, and carrying out a spray drying process to prepare a boron nitrogen oxygen co-doped graphene / sulfur composite three-dimensional structured positive electrode material of the lithium sulfur battery. The boron nitrogen oxygen co-doped graphene / sulfur compound obtained in the invention has a simple and convenient preparation process; and through the simple spray drying process, the loosening and porous structure is manufactured, a relatively large specific surface area is obtained, and performance for bearing a large amount of elementary nanometer sulfur powder is further achieved, thereby improving the sulfur content of the positive electrode material.

Description

technical field [0001] The technical solution of the invention relates to an electrode composed of active materials, in particular to a preparation method of a cathode material for a lithium-sulfur battery. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop lithium-ion batteries with higher energy density to meet market demands. At present, the theoretical specific capacity of the commercialized lithium-ion battery is limited by its own theoretical specific capacity of 300mAh / g, which obviously cannot meet the quality requirements for the practical application of lithium-ion batteries, while the theoretical specific capacity of the new lithium-sulfur battery is about Five times the theoretical specific capacity of ion batteries (theoretical specific capacity is 1675mAh / g, specific energy is 2500Wh / kg), it is considered to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 张永光王新钊妍
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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