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A kind of preparation method of lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in the field of electrochemistry, can solve problems such as energy waste, harmful gas generation, environmental pollution, etc., and achieve the effects of high production efficiency, saving time and cost, and high-efficiency doping

Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strategy of melt-diffusion and hydrothermal not only requires long-term continuous heating (≥12h, ≥155°C), resulting in huge energy waste, but also produces harmful gases, causing environmental pollution

Method used

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  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material

Examples

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Embodiment 1

[0036] A preparation method for a lithium-sulfur battery positive electrode material, comprising the following steps:

[0037] (1) Clean the current collector: punch the nickel foam collector into a disc with a diameter of 15mm by a punching machine, and use a tablet press to compress the disc with a pressure of 180kg / cm 2 , and then cleaned by acetone, deionized water, 1mol / l dilute hydrochloric acid, deionized water, absolute ethanol, and deionized water ultrasonically. The cleaning time of each step is 20min, and then in a vacuum oven at 45° , baked for 8 hours and weighed;

[0038] (2) Preparation of lithium-sulfur positive electrode material: the foamed nickel after cleaning is placed in figure 1 In the reaction chamber of the inductively coupled plasma device shown, the operating frequency of the plasma device is 13.56MHz, and the vacuum is pumped. After the pressure of the reaction chamber reaches 10Pa, argon and nitrogen are introduced into the reaction according to t...

Embodiment 2

[0040] A preparation method for a lithium-sulfur battery positive electrode material, comprising the following steps:

[0041] (1) Clean the current collector: punch the copper foam collector into a disc with a diameter of 15mm through a punching machine, and use a tablet press to compress the disc with a pressure of 180kg / cm 2 , and then cleaned by acetone, deionized water, 1mol / l dilute hydrochloric acid, deionized water, absolute ethanol, and deionized water ultrasonically. The cleaning time of each step is 20min, and then in a vacuum oven at 45° , baked for 8 hours and weighed;

[0042] (2) Preparation of lithium-sulfur cathode material: put the cleaned foamed copper in figure 1 In the reaction chamber of the shown inductively coupled plasma device, the operating frequency of the plasma device is 13.56 MHz, and the vacuum is pumped. After the pressure of the reaction chamber reaches 10 Pa, the argon reaction gas is introduced. After the pressure is 50Pa, carbon disulfide...

Embodiment 3

[0044] A preparation method for a lithium-sulfur battery positive electrode material, comprising the following steps:

[0045](1) Clean the current collector: punch the aluminum foil collector into a disc with a diameter of 15 mm through a punching machine, and then wash it with acetone, deionized water, 1mol / l dilute hydrochloric acid, deionized water, and absolute ethanol Cleaning, ultrasonic cleaning with deionized water, the cleaning time of each step is 20min, and then baked in a vacuum oven at 45°C for 8h and weighed;

[0046] (2) Preparation of lithium-sulfur cathode material: put the cleaned aluminum foil in the reaction chamber of the capacitively coupled plasma device. The operating frequency of the plasma device is 13.56MHz, and vacuumize. After the pressure of the reaction chamber reaches 10Pa, Turn on the heating switch, set the heating temperature of the sample stage to 120°C, and continue heating for 1 hour after reaching the set heating temperature, and pass ar...

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Abstract

The invention relates to a preparation method of a positive electrode material of a lithium-sulfur battery, which includes cleaning the current collector: cutting the current collector into a disc, and performing multi-step cleaning treatment: cleaning with acetone, cleaning with deionized water, cleaning with dilute hydrochloric acid, and cleaning with deionized water Cleaning, cleaning with absolute ethanol, ultrasonic cleaning with deionized water, and then drying and weighing; preparation of lithium-sulfur cathode material: put the cleaned current collector in the reaction chamber of the plasma device, vacuumize, and Under the action, carbon disulfide is introduced, and the groups containing carbon and sulfur are ionized under the action of the plasma reaction gas, and the groups are directly deposited on the current collector. The preparation method of the present invention prepares the electrode material through a one-step plasma method without adding any binder or conductive agent, the method is simple, the preparation period is short, not only the cost is saved, but also the preparation process is harmless and environment-friendly.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a positive electrode material of a lithium-sulfur battery. Background technique [0002] With the widespread use of portable electronic devices, electric vehicles, and large-scale energy storage grids, there is an urgent need for an energy storage system with higher energy density, higher safety, and lighter weight. Lithium-sulfur batteries have attracted widespread attention due to their high energy density (2600Wh / kg, 2 to 3 times that of traditional lithium-ion batteries) and high specific capacity (1675mAh / g). However, the commercialization of lithium-sulfur batteries still faces many challenges. The charge product (S8) and discharge product (Li 2 S and Li 2 S 2 ) requires a large amount of conductive additives to improve ionic conductivity and electronic conductivity because of its insulating properties, which increases the difficulty o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/04C23C16/513H01M10/052
CPCC23C16/513H01M4/0428H01M4/139H01M10/052Y02E60/10
Inventor 周海平何苗吴孟强张子栋廖家轩徐自强冯婷婷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA