Preparation method for lithium-sulfur battery taking carbon-supported boron-lithium alloy as negative electrode material
A negative electrode material, lithium-sulfur battery technology, applied in lithium batteries, electrolyte battery manufacturing, negative electrodes, etc., can solve the problems of capacity loss, poor cycle life, lithium-sulfur battery capacity decline, etc. to improve safety and reliability
Inactive Publication Date: 2017-04-26
ZHEJIANG UNIV
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- 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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Examples
Experimental program
Comparison scheme
Effect test
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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The invention relates to preparation of a lithium-sulfur battery, and aims to provide a preparation method for a lithium-sulfur battery taking a carbon-supported boron-lithium alloy as a negative electrode material. The preparation method comprises the steps of adding silicone adhesive into N-methyl pyrrolidone to be stirred and heated to obtain an NMP solution of the silicone adhesive; uniformly mixing elementary sulfur with conductive carbon black, performing vacuum heating and heat preservation, and cooling to obtain a carbon-supported sulfur material; enabling the carbon-supported sulfur material, acetylene black and the NMP solution of the silicone adhesive to be mixed and then grinded, and preparing into paste shape to coat an aluminum film; drying in the shade and pressing and shaping to obtain a positive electrode plate; and assembling the positive electrode plate, a micropore polypropylene diaphragm and a negative electrode plate into a battery shell, adding an electrolyte and sealing to obtain the lithium-sulfur battery. By virtue of the boron-lithium alloy having extremely high lithium deintercalation specific capacity, the speed capacity of the lithium-sulfur battery is improved, and the lithium-sulfur battery can be used as a power battery of an electric vehicle; the synthetic method is simple in process and free of toxic substances; only CO<2> and water are discharged in the whole synthetic process, so that the lithium-sulfur battery is green and environment-friendly; and large-scale production capability is achieved.
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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Login to View More 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