Preparation method of lithium-sulfur battery using carbon-supported boron-lithium alloy as negative electrode material

A negative electrode material, lithium-sulfur battery technology, applied in the direction of lithium battery, electrolyte battery manufacturing, negative electrode, etc., can solve the problems of capacity loss, poor cycle life, lithium-sulfur battery capacity decline, etc., to improve life and reduce electrode , improve the effect of safety and reliability

Inactive Publication Date: 2019-01-11
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life

Method used

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  • Preparation method of lithium-sulfur battery using carbon-supported boron-lithium alloy as negative electrode material
  • Preparation method of lithium-sulfur battery using carbon-supported boron-lithium alloy as negative electrode material
  • Preparation method of lithium-sulfur battery using carbon-supported boron-lithium alloy as negative electrode material

Examples

Experimental program
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Embodiment 1

[0040] Embodiment one: the preparation of lithium metaborate

[0041] LiOH (23.9g) and boric acid (H 3 B(OH) 3 ) (74.8g) was dissolved in 200mL distilled water, stirred and dissolved, and evaporated to dryness by microwave. Heating to 600°C for dehydration for 6 hours to obtain anhydrous lithium metaborate.

Embodiment 2

[0042] Example 2: Preparation of carbon-supported boron-lithium alloy

[0043] Take the anhydrous lithium metaborate (1g) prepared in Example 1, add polyacrylonitrile powder (0.5g) in the ball mill tank at a mass ratio of 1:0.5, ball mill for 1 hour at a rotating speed of 1000rpm, and take out lithium metaborate and polyacrylonitrile. The mixture of acrylonitrile is placed in a stainless steel reactor, heated at 700°C for 5 hours after vacuuming, cooled to 600°C and vacuumed to remove the reaction atmosphere, and cooled to 25°C to obtain a carbon-supported boron-lithium alloy.

Embodiment 3

[0044] Embodiment Three: Binder Modulation

[0045] Add commercially available silicone gum (5 g) to 95 g of NMP (N-methylpyrrolidone), stir and heat to 90° C., stir for 2 hours to obtain a silicone gum NMP solution, and cool to room temperature for later use.

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Abstract

The invention relates to the preparation of a lithium-sulfur battery, and aims to provide a preparation method of a lithium-sulfur battery using a carbon-supported boron-lithium alloy as a negative electrode material. Including: adding silicone glue into N-methylpyrrolidone and stirring and heating to obtain NMP solution of silicone glue; mixing elemental sulfur and conductive carbon black evenly, heating and insulating in vacuum, and obtaining carbon-loaded sulfur material after cooling; carbon-loaded sulfur Materials, acetylene black and NMP solution of silicone glue are mixed and ground, prepared into a paste and coated on the aluminum film; dried in the shade and then pressed to form a positive electrode sheet; the positive electrode sheet microporous polypropylene diaphragm negative electrode sheet is installed in the battery case In the process, electrolyte solution is added, and a lithium-sulfur battery is obtained after sealing. The invention utilizes the characteristic of extremely high delithiation specific capacity of the boron-lithium alloy, improves the speed capacity of the lithium-sulfur battery, and can be used as a power battery of an electric vehicle. The synthesis method is simple in process, does not contain toxic substances, only emits CO2 and water in the whole synthesis process, is green and environmentally friendly, and has the ability of large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery, more specifically, the invention relates to a preparation method of a lithium-sulfur battery using a carbon-supported boron-lithium alloy as a negative electrode material. Background technique [0002] The traditional lithium-sulfur battery uses metal lithium as the negative electrode material and uses a liquid electrolyte. During discharge, the negative electrode reaction is that lithium loses electrons and becomes lithium ions, and the positive electrode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. The potential difference between the positive and negative electrodes is The discharge voltage provided by lithium-sulfur batteries. Under the action of an applied voltage, the positive and negative reactions of the lithium-sulfur battery proceed in reverse, which is the charging process. According to the unit mass of elemental sulfur is completel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/40H01M4/62H01M4/1395H01M10/052H01M10/058
CPCH01M4/1395H01M4/405H01M4/622H01M4/628H01M10/052H01M10/058H01M2004/027Y02E60/10Y02P70/50
Inventor 李洲鹏邵金杰刘宾虹
Owner ZHEJIANG UNIV
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