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A kind of manufacturing method of lithium-sulfur battery positive electrode and lithium-sulfur battery

A technology for lithium-sulfur batteries and manufacturing methods, which is applied in the field of lithium-ion batteries, can solve problems such as poor stability, positive electrode structure damage, and low rate, and achieve the effects of ensuring uniformity and conductivity, reducing sulfur loss, and balancing volume changes

Active Publication Date: 2020-02-07
湖南镓睿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor stability and low rate of lithium-sulfur batteries have always hindered the large-scale commercialization of lithium-sulfur batteries.
[0003] At present, the bottlenecks that limit the commercialization of lithium-sulfur batteries are mainly low cycle stability and low rate performance.
The main causes of these two problems are the loss of positive electrode active materials caused by the shuttle effect, and the destruction of the positive electrode structure caused by the volume change of the sulfur positive electrode.

Method used

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  • A kind of manufacturing method of lithium-sulfur battery positive electrode and lithium-sulfur battery
  • A kind of manufacturing method of lithium-sulfur battery positive electrode and lithium-sulfur battery
  • A kind of manufacturing method of lithium-sulfur battery positive electrode and lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0041] A method for making a positive electrode of a lithium-sulfur battery, specifically comprising the following steps:

[0042] Step 1: Take 10g of Bacillus subtilis powder (GPBBS), add 4g of glucose, 200ml of deionized water, stir well and let it stand for 16 hours to activate.

[0043] Step 2: Take the activated bacterial suspension and centrifuge at 1500 rpm for 2 minutes, and discard the precipitate.

[0044] Step 3: Take the centrifuged turbid liquid in step 2 and centrifuge it at 4500 rpm for 5 min, discard the supernatant, and precipitate the crude GPBBS.

[0045] Step 4, the crude GPBBS was washed and centrifuged in sequence with ethanol, hydrochloric acid and water to obtain a refined GPBBS wet powder, which was freeze-dried for 72 hours to obtain a refined GPBBS dry powder.

[0046] Step 5. After heating the refined GPBBS dry powder at 500°C for 4 hours without oxygen, mix it with sulfur powder at a mass ratio of 1:2, and mill it with a high-energy ball mill at a...

Embodiment 2

[0057] A method for making a positive electrode of a lithium-sulfur battery, specifically comprising the following steps:

[0058] Step 1: Take 10 g of camellia oleifera shells and soak them in sulfuric acid for 12 hours, then wash them with ethanol and clear water.

[0059] Step 2: Mechanically grind the camellia oleifera husk to a particle size of about 900nm, remove impurities, and freeze-dry.

[0060] Step 3: Heat the freeze-dried camellia oleifera shell to 410°C for 2 hours without oxygen to obtain charcoal powder of camellia oleifera shell, then mix it with sulfur powder at a mass ratio of 1:2, and ball mill at 3500 RPM.

[0061] Step 4, step 3 obtained sulfur compound oleifera shell charcoal obtained sulfur compound bacterial charcoal powder gets 0.4g and is dispersed in 4.5g N,N-dimethylformamide (DMF), adds 0.6g polyacrylonitrile (PAN), and carries out Electrospinning, controlling the thickness of the electrospinning thread to be about 1000nm, to obtain sulfur-compos...

Embodiment 3

[0067] A method for making a positive electrode of a lithium-sulfur battery, specifically comprising the following steps:

[0068] Step 1: Take 10 g of dried osmanthus leaves and soak them in sulfuric acid for 12 hours, then wash them with ethanol and clear water.

[0069] Step 2: mechanically grind the leaves of osmanthus fragrans to a particle size of about 900nm, remove impurities and freeze-dry.

[0070] Step 3: Heat the obtained sweet-scented osmanthus leaves to 600° C. for carbonization in isolation from oxygen, then mix them with sulfur powder at a mass ratio of 1:2, and ball mill at a speed of 3500 RPM.

[0071] Step 4: Get 0.8g of the obtained sulfur composite leaf charcoal powder and disperse it in 4.5gN, N-dimethylformamide (DMF), add 0.6g polyacrylonitrile (PAN), and carry out electrospinning to control the electrospinning process. The thread thickness is about 1000nm. Obtain multi-level micro-tandem osmanthus leaf charcoal.

[0072] Step five, the multi-stage m...

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Abstract

The invention provides a manufacturing method of a lithium-sulfur battery positive electrode, which comprises the steps of activating biomass to form a multi-stage pore structure; removing impuritiesfrom the activated biomass; then carrying out freeze drying; then heating and carbonizing the dried biomass, and compounding the carbonized biomass with sulfur powder through ball milling; carrying out electrostatic spinning on the ball-milled sulfur composite biochar powder to form a biochar multi-stage micro-column structure; carrying out laser point-by-point scanning on the multi-stage micro-column structure of the biochar to obtain a biomass carbon-sulfur compound; then placing the biomass carbon-sulfur compound obtained after treatment in an inert gas for heating; and finally uniformly mixing the biomass carbon-sulfur compound with a conductive agent and a binder, coating a metal current collector with the mixture, and slicing to obtain the lithium-sulfur battery positive electrode taking the biochar as a base material. The invention further provides a lithium-sulfur battery adopting the lithium-sulfur battery positive electrode prepared according to the method. The lithium-sulfurbattery is high in stability, relatively high in specific capacity and Coulombic efficiency and good in cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular, to a method for manufacturing a positive electrode of a lithium-sulfur battery and the lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries are one of the strong candidates for new lithium batteries. Its low-cost and high-capacity characteristics attract battery manufacturers all the time; sulfur materials are much lower than the cost of lithium iron phosphate in current commercial batteries. However, the poor stability and low rate of lithium-sulfur batteries have always hindered the large-scale commercialization of lithium-sulfur batteries. [0003] Currently, the bottlenecks that limit the commercialization of lithium-sulfur batteries are mainly low cycle stability and low rate performance. The main causes of these two problems are the loss of positive active materials caused by the shuttle effect and the structural damage of the positive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/60H01M4/139H01M10/052
CPCH01M4/139H01M4/38H01M4/602H01M4/625H01M10/052Y02E60/10
Inventor 朱建李镓睿周剑陈旭罗海燕吴振军吴苑菲
Owner 湖南镓睿科技有限公司
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