Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, active material electrodes, etc., can solve the problems of storing sulfur substances, unable to provide large pore volume, etc., to improve electrical conductivity, good electrochemical advantages, The effect of avoiding harm

Active Publication Date: 2020-08-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charging and discharging process, the CoS 2 Usually cannot pro

Method used

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  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar
  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar
  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar

Examples

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Example Embodiment

[0021] Embodiment 1: A method for preparing a lithium-sulfur battery cathode material made of three-dimensional mesoporous bio-carbon, the specific steps are as follows:

[0022] Step 1: Add 25 grams of glucose, 7.5 grams of yeast powder, 10 grams of peptone, and 10 grams of disodium hydrogen phosphate into a large beaker containing ultrapure water. Stir the solution until it is clear and then add glacial acetic acid to pH=4- 5. Obtain bacterial growth liquid;

[0023] Step 2: Pour the bacterial growth solution into an Erlenmeyer flask, sterilize it in a high-temperature sterilization box at 155°C for 30 minutes, cool the sterilized growth solution to room temperature in air, and then transfer the Acetobacter xylinum strains. Incubate in an incubator at 30°C for 7 days to make a light yellow BC liquid gel;

[0024] Step 3: Soak the light yellow BC liquid gel in deionized water at 80°C for 5 hours, and then purify it in a 0.5 mol / L NaOH solution until the color becomes milky white. ...

Example Embodiment

[0032] Example 2: Preparation of three-dimensional mesoporous biochar to produce S@CoS 2 / N-CNFs (40%) lithium-sulfur battery cathode material method, in Example 2, except that Step 4 is different from that in Example 1, other steps are the same. In step four, add 0.2 grams of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 O 3 ·5H 2 O and 0.067 g of melamine were dissolved in 30 mL of deionized water containing 0.1 g of bacterial cellulose aerogel, and subjected to hydrothermal synthesis at 130°C for 12 hours to obtain 50% CoS 2 The nitrogen doping amount is 40% hydrothermal product, denoted as CoS 2 / 40% N-BC to prepare the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (40%), and prepared a coin cell corresponding to the cathode material.

[0033] Figure 4 with Figure 5 Respectively the CoS prepared in Example 2 2 / N-CNFs (40%) X-ray diffraction pattern and scanning electron microscope topography, Figure 4 Shows that 40% N doping in Example 2 did not affect CoS 2 Generated from...

Example Embodiment

[0034] Example 3: Preparation of three-dimensional mesoporous biochar to produce S@CoS 2 / N-CNFs (60%) lithium-sulfur battery cathode material method, in Example 3, except that Step 4 is different from that in Example 1, other steps are the same. In step four, add 0.2 grams of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 O 3 ·5H 2 O and 0.15 g of melamine were dissolved in 30 ml of deionized water containing 0.1 g of bacterial cellulose aerogel and hydrothermally synthesized at 130°C for 12 hours to obtain 50% CoS 2 The amount of nitrogen doped under is 60% hydrothermal product, denoted as CoS 2 / 60% N-BC to prepare the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (60%), and prepare a button battery corresponding to the cathode material.

[0035] Figure 7 with Figure 8 Respectively the CoS prepared in Example 3 2 / N-CNFs (60%) X-ray diffraction pattern and scanning electron microscope topography, Figure 7 It shows that the 60% N doping in Example 3 does not affect CoS 2 Gener...

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Abstract

The invention discloses a method for preparing a lithium-sulfur battery cathode material from three-dimensional mesoporous biochar. The method comprises the following steps of transferring acetobacterxylinum into a prepared growth solution, culturing to obtain a BC product, and carrying out subsequent treatment to obtain BC aerogel; then, carrying out hydrothermal synthesis on the BC aerogel, CoCl2. 6H2O, Na2S2O3. 5H2O and melamine, and obtaining a series of CoS2/N-BC with different N-containing ratios; and finally, carbonizing CoS2/N-BC, and carrying out high-temperature melting sulfur loading on the carbonized CoS2/N-BC and sulfur in a certain mass ratio in a tubular furnace filled with N2 to obtain the three-dimensional mesoporous S-coated CoS2/N-CNFs lithium-sulfur battery positive electrode material composed of biochar. The BC has high specific surface area and high porosity, and the fiber surface is rich in-OH functional groups, so that CoS2 and N atoms can be uniformly loaded to the BC. The N-doped and CoS2 nano particles provide sulfur nucleophilic sites, and the shuttle effect in the electrochemical process is inhibited by chemically adsorbing lithium polysulfide (LiPSs),so that the cycle life of the electrode material is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material, in particular to a preparation of a three-dimensional mesoporous biocarbon-made lithium-sulfur battery cathode material. Background technique [0002] Rechargeable lithium-sulfur batteries are a promising option for energy storage applications due to their low cost and high energy density. However, the electrochemical performance of sulfur cathodes is greatly compromised due to the rapid capacity fading caused by polysulfide dissolution / shutling and the low specific capacity due to the poor conductivity of active materials. To address these issues, efforts have been made to optimize the structural design of various host materials, especially carbon nanomaterials. However, polysulfides cannot be effectively anchored in long-term cycling due to the lack of chemical affinity. To improve the anchoring of intermediate polysulfides, inorganic polar materials (especi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052C01B32/05C01G51/00
CPCC01G51/30C01B32/05H01M4/364H01M4/38H01M4/5815H01M4/625H01M10/052C01P2002/72C01P2004/03C01P2006/40H01M2004/028Y02E60/10
Inventor 郭瑞松王淑慧
Owner TIANJIN UNIV
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