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Lithium-sulfur battery positive electrode material and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., to achieve the effect of improving utilization, strong adsorption, and improving long-range stability of batteries

Active Publication Date: 2020-11-27
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a lithium-sulfur battery positive electrode material and a preparation method thereof for the above-mentioned defects, the positive electrode material has high mechanical strength, good electrical conductivity and thermal stability; improve the problem of poor sulfur conductivity; alleviate Shuttle effect; at the same time, it can promote the conversion of polysulfides and improve the utilization of active substances

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof

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Embodiment 1

[0019] The anode material of the lithium-sulfur battery is a metallized boron nitride nanotube / sulfur composite material.

[0020] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0021] (1) Preparation of metallized boron nitride nanotubes: borohydride (HfB 2 ) as the anode and graphite as the cathode, and the initial pressure is 700mbar and filled with a nitrogen atmosphere, and a stable plasma is established at a DC 60A and a voltage of 20V for at least 15min, producing dark gray smoke and depositing on the inner wall of the container, that is, Metallized boron nitride nanotubes;

[0022] (2) Preparation of metallized boron nitride nanotube / sulfur composite material: first, the metallized boron nitride nanotube and sulfur powder obtained in step (1) are weighed and mixed in a ratio of 1:3 by mass, and placed in Grind it into a uniform and fine powder mixture in a mortar; then add carbon disulfide drop...

Embodiment 2

[0024] (1) Preparation of metallized boron nitride nanotubes: borohydride (HfB 2 ) as the anode and graphite as the cathode, the initial pressure is 700mbar and filled with a nitrogen atmosphere, and a stable plasma is established at a DC 60A and a voltage of 40V for at least 15min to produce dark gray smoke and deposit on the inner wall of the container, that is, Metallized boron nitride nanotubes;

[0025] (2) Preparation of metallized boron nitride nanotube / sulfur composite material: first, the metallized boron nitride nanotube and sulfur powder obtained in step (1) are weighed and mixed in a ratio of 1:3 by mass, and placed in Grind it into a uniform and fine powder mixture in a mortar; then add carbon disulfide dropwise into the mortar, grind it thoroughly again for at least 30 minutes, and then place it in a reaction kettle for hydrothermal reaction at 155°C for 12 hours to obtain metallized nitriding Boron nanotube / sulfur composites.

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a metallized boron nitride nanotube / sulfur composite material. The positive electrode material has relatively high mechanical strength and good conductivity and thermal stability; the problem of poor sulfur conductivity is solved; the shuttle effect is relieved; meanwhile, conversion of polysulfide can be promoted, and the utilization rate of active substances is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of the economy, the demand for energy continues to increase, and the development of new sustainable energy while taking into account the fragile environment has become the focus of our attention. To this end, we must reduce our dependence on fossil fuels and turn to clean and sustainable energy utilization methods such as photovoltaic power generation, wind turbine power generation, and tidal power generation that are being implemented all over the world. These renewable energy sources with intermittent characteristics require advanced energy storage systems to store energy when there is excess energy and release energy when there is demand, so as to maintain the balance of energy supply. Batteries can efficiently store...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052C01B21/064
CPCH01M4/38H01M4/624H01M4/628H01M10/052C01B21/064C01B21/0648H01M2004/021H01M2004/028Y02E60/10
Inventor 王新宋彩玲
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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