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Lithium-sulfur battery positive pole piece with self-repairing function and preparation method thereof
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A positive pole piece, lithium-sulfur battery technology, applied in the field of electrochemical batteries, can solve problems such as loss of effectiveness and consumption
Active Publication Date: 2020-01-24
CHANGZHOU UNIV +1
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However, both polysulfides and these organic polysulfide compounds are easily soluble in the electrolyte. During the charging and discharging process, they will also shuttle back and forth between the positive and negative electrodes, thereby being continuously consumed. After several cycles, the will be useless
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Embodiment 1
[0057] Embodiment 1 prepares sulfur composite material
[0058] 1) First weigh 1g of acetylene black and 15ml of 68wt% concentrated nitric acid and put them in a three-neck flask, react in a constant temperature oil bath at 100°C for 12h, centrifuge and wash with deionized water continuously, after more than 20 times of centrifugal washing, put Dry in a vacuum oven.
[0059] 2) Take 0.2 g of acidified acetylene black from 1) and disperse it in 100 ml of toluene, and add 3 ml of 3-chloropropyltrimethoxysilane dropwise. Constant temperature oil bath, the temperature is controlled at 90°C, react for 6-12h; after the reaction is completed, filter, wash several times and put it in a drying oven to dry for 12h.
[0060] 3) Take 0.2g of elemental sulfur and 1.5g of sodiumsulfide nonahydrate in 100ml of deionized water, heat and stir for 3 hours to obtain a light yellow sodium polysulfide solution.
[0061] 4) Take 0.2g of the product from 2) and disperse it in 100ml of deionized w...
Embodiment 2
[0064] Embodiment 2 prepares sulfur composite material
[0065] The difference from Example 1 is that the carbon matrix material is directly grafted with disulfide-containing organic compounds after acidification.
[0066] 1) Weigh 1g of carbon nanotubes, measure 5ml of 68wt% concentrated nitric acid and 5ml of 98wt% concentrated sulfuric acid, react them in a constant temperature oil bath at 100°C for 10h in a round bottom flask, wash them several times, and dry them at 70°C for 8h to obtain the surface Carbon nanotubes rich in hydroxyl and carboxyl groups.
[0067] 2) Take 0.2g of the product from 1) and disperse it in 100ml of deionized water, drop into 1ml of 98wt% concentrated sulfuric acid and 5ml of mercaptoacetic acid successively, heat to reflux for 24h, wash with deionized water and ethanol several times, and dry in vacuum at 60°C 12h.
[0068] 3) Dissolve 3.2 g of elemental sulfur and 6 g of sodiumsulfide nonahydrate in distilled water, heat and stir at 50° C. to...
Embodiment 3
[0070] Embodiment 3 prepares sulfur composite material
[0071] The difference between this embodiment and Example 1 is that the carbon matrix material used is grapheneoxide without acidification treatment. Other steps are identical with embodiment 1. The prepared sulfur composite material is numbered M3.
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Abstract
The invention discloses a lithium-sulfur battery positive pole piece with a self-repairing function and a preparation method thereof and belongs to the technical field of an electrochemical battery. Apositive pole piece of the lithium-sulfur battery is composed of a sulfurcomposite material grafted with disulfide bonds / polysulfide bonds and binder, the disulfide bonds / polysulfide bonds in the sulfur composite material and the binder are dynamic reversible covalent bonds, and the self-repairing function is provided. In the charging and discharging process of the lithium-sulfur battery, the self-repairing function of the disulfide / polysulfide bonds in the sulfur composite material and the binder can be used for repairing cracks generated in the pole piece and regulating and controlling thephase transfer process of active substances in the charging and discharging process, agglomeration of nanoparticles is avoided, uniform deposition of active substances is achieved, and then high performance and long cycle life of the lithium-sulfur battery are achieved.
Description
technical field [0001] The invention belongs to the technical field of electrochemical batteries, and relates to a positive pole piece of a lithium-sulfur battery with a self-repairing function and a preparation method thereof, in particular to a method for preparing a positive pole piece of a self-repairing lithium-sulfur battery with a zipper structure. Background technique [0002] In recent years, with the rapid development of mobile energy storage devices, people have put forward higher energy density and cycle life requirements for existing commercial secondary battery systems. Among the existing commercial secondary battery systems, the lithium-ion battery with embedded transition metal oxides as the positive electrode material and graphite as the negative electrode is the secondary battery system with the best comprehensive performance. However, limited by the theoretical specific capacity, it is difficult for traditional lithium-ion batteries to further significantl...
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