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Lithium-sulfur battery iron-based biomass carbon intermediate layer, preparation method thereof and lithium-sulfur battery

A biomass carbon, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, electrode manufacturing, etc., can solve the problems of high cost and complicated preparation process, and achieve the effect of guaranteeing effect, simple preparation process and improving performance.

Pending Publication Date: 2021-09-21
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, materials such as metal-organic frameworks, sulfides, and conductive polymers that have been proposed have problems such as complex preparation processes and high costs, which are not enough to meet future market demand.

Method used

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  • Lithium-sulfur battery iron-based biomass carbon intermediate layer, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery iron-based biomass carbon intermediate layer, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery iron-based biomass carbon intermediate layer, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0034] A method for preparing an iron-based biomass carbon intermediate layer of a lithium-sulfur battery of the present invention comprises the following steps:

[0035] (1) Use 0.1-1mol / L hydrochloric acid to pickle waste biomass for 2-6 hours, then wash with water until neutral, and dry to obtain biomass. There are many impurities in the waste biomass. After pickling, some impurities are reduced and washed to neutral for subsequent treatment.

[0036] (2) Mix the biomass prepared in step (1) with ferric nitrate, ferric sulfate, and ferric chloride as an iron-containing reagent for 2-6 hours, and dry to obtain iron-based biomass. The mass fraction of the base biomass is 5-15%. If the mass fraction of the iron-containing reagent is too small, the electrochemical performance of the material will be affected, and if the mass fraction is too large, the stability of the material will be affected.

[0037] (3) Place the iron-containing biomass produced in step (2) in a tube furna...

Embodiment 1

[0040] Step 1: Soak waste biomass in 0.1 mol / L hydrochloric acid for 6 hours for pickling, then wash with water until neutral and dry. get biomass.

[0041] Step 2: mixing the biomass with the ferric nitrate solution and ultrasonically vibrating for 2 hours to obtain a solution with a mass fraction of the iron-containing reagent of 8%, and drying to obtain the iron-based biomass.

[0042] Step 3: Put the iron-based biomass produced in Step 2 in a tube furnace fed with argon, heat at 800° C. for 3 hours, and cool to room temperature to obtain iron-based biomass carbon.

[0043] Step 4: After the iron-based biomass produced in Step 3 is pressed into tablets, it is cut into a circular middle layer with a diameter of 16 mm by a cutting machine, and the preparation of the middle layer is completed.

[0044] figure 1It is the SEM image of cotton soft towel as biomass after carbonization in Example 1. From the figure, it can be seen that cotton soft towel can provide a one-dimensio...

Embodiment 2

[0049] Step 1: Soak waste biomass in 0.2 mol / L hydrochloric acid for 5 hours for pickling, then wash with water until neutral and dry. get biomass.

[0050] Step 2: mixing the biomass with the ferric sulfate solution and ultrasonically vibrating for 3 hours to obtain a solution with a mass fraction of the iron-containing reagent of 15%, and drying to obtain the iron-based biomass.

[0051] Step 3: Put the iron-based biomass produced in Step 2 in a tube furnace fed with nitrogen, heat at 900° C. for 3 hours, and cool to room temperature to obtain iron-based biomass carbon.

[0052] Step 4: After the iron-based biomass carbon produced in Step 3 is pressed into sheets, it is cut into a circular middle layer with a diameter of 16 mm by a cutting machine, and the preparation of the middle layer is completed.

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Abstract

The invention discloses a lithium-sulfur battery iron-based biomass carbon intermediate layer, a preparation method thereof and a lithium-sulfur battery. The method comprises the following steps: step 1, cleaning and drying biomass to obtain neutral biomass; step 2, adding the neutral biomass in the step 1 into an iron-containing solution, and drying to obtain iron-based biomass; step 3, calcining the iron-based biomass in the step 2 to obtain iron-based biomass carbon; and step 4, tabletting the iron-based biomass carbon in the step 3 to obtain the iron-based biomass carbon intermediate layer. The biomass carbon-based material used in the invention has relatively good conductivity and adsorption performance, the preparation process is relatively simple, the raw material source is wide, and the middle layer prepared from the biomass carbon-based material has a certain adsorption effect on polysulfide generated in a lithium-sulfur battery due to an oxidation-reduction reaction, can inhibit a shuttle effect, and can effectively improve the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, in particular to an iron-based biomass carbon intermediate layer of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] At present, with the popularity of portable electronic devices, people have put forward higher and higher requirements for energy storage systems. Lithium-sulfur batteries with sulfur as the positive electrode and metallic lithium as the negative electrode have high theoretical specific capacity, low cost, Environmentally friendly and other advantages, it has a good application prospect in reducing the use of fossil fuels. [0003] However, the defects of lithium-sulfur batteries greatly limit its development. One of the main factors leading to the performance degradation of lithium-sulfur batteries is the "shuttle effect". During the discharge process, the intermediate product lithium polysulfide dissolves in the electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/583H01M4/62H01M10/052
CPCH01M4/0402H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 杨蓉孟庆龙李明旭刘莹陈绍征樊潮江
Owner XIAN UNIV OF TECH
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