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A method for inhibiting the growth of zinc dendrites in zinc batteries
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A technology of zinc dendrite and zinc battery, applied in the field of material chemistry, can solve the problems such as application restriction of secondary zinc battery, unstable thermodynamic properties of electrode material, influence of zinc battery performance, etc.
Active Publication Date: 2022-04-05
NINGBO UNIV
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Problems solved by technology
The thermodynamic properties of secondary zinc battery electrode materials are unstable, and the charging product zincate has high solubility in strong alkali solution, and the zinc electrode is prone to deformation, dendrite growth, self-corrosion and vulcanization, etc., which makes the zinc battery The performance is affected, which severely restricts the application of secondary zinc batteries
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Embodiment 1
[0020] Cut natural silkworm cocoons into discs with a diameter of 20 mm, wash with ethanol to remove impurities, soak in ethanol solution containing 0.2% by mass percentage of 4,4'-diamino-2,2'-bipyridyl, and ultrasonically vibrate for 4 hours , take out the cocoon slices, put them in an oven to dry at 80°C for 2 hours, and obtain cocoon slices with 4,4'-diamino-2,2'-bipyridine on the surface, and then transfer the above cocoon slices into a tube furnace, in N 2 Calcined at 700°C for 4 hours in the atmosphere, and then cooled down to room temperature naturally to obtain a carbonized silk protein doped material. Its structure is tested by powder X-ray diffraction (XRD), and the results show that the two diffraction peaks in the figure are the diffraction peaks of carbon ( figure 1 ); The morphology of the prepared material was observed with a scanning electron microscope (SEM), and the results showed that the material was nanofibrous ( figure 2 ); use the prepared carbonized...
Embodiment 2
[0022] Cut natural silk cocoons into discs with a diameter of 16mm, wash with ethanol to remove impurities, soak in ethanol solution containing 0.05% by mass percentage of 4,4'-diamino-2,2'-bipyridine, and ultrasonically shake for 4 hours , take out the cocoon pieces, put them in an oven and dry them at 80°C for 2 hours to get the cocoon pieces with 4,4'-diamino-2,2'-bipyridine attached on the surface, and then transfer them into a tube furnace, under N 2 Calcined at 400°C for 6 hours in the atmosphere, and then cooled down to room temperature naturally to obtain a carbonized silk protein doped material. The materials prepared above were subjected to XRD, SEM test analysis and electrochemical performance test.
Embodiment 3
[0024] Cut natural silk cocoons into discs with a diameter of 18 mm, wash with ethanol to remove impurities, soak in ethanol solution containing 0.1% by mass percentage of 4,4'-diamino-2,2'-bipyridyl, and ultrasonically vibrate for 4 hours , take out the cocoon pieces, put them in an oven and dry them at 80°C for 2 hours to get the cocoon pieces with 4,4'-diamino-2,2'-bipyridine on the surface, and then transfer them into a tube furnace, 2 Calcined at 500°C for 5 hours in the atmosphere, and then cooled down to room temperature naturally to obtain a carbonized silk protein doped material. The materials prepared above were subjected to XRD, SEM test analysis and electrochemical performance test.
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Abstract
The invention discloses a method for inhibiting the growth of zinc dendrites in a zinc battery. In the invention, appropriate natural silkworm cocoons are cut into discs, put into a beaker, added a certain amount of water and ethanol to clean, and after removing impurities, the 4,4'-diamino-2,2'-bipyridyl ethanol solution, ultrasonic vibration, drying in an oven, and then put into a tube furnace under N 2 Burning at a temperature of 400-700°C for a certain period of time under the atmosphere to obtain a carbonized silk protein doped material; the obtained carbonized silk protein doped material is used as a zinc electrode surface protective layer material in a zinc battery, and the growth of zinc dendrites is obtained. In order to suppress, improve the service life and safety performance of zinc batteries, this material has broad application prospects. In the whole preparation process, the operation is simple, the cost of raw materials is low, the investment in equipment is small, and it is suitable for mass production.
Description
technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a method for inhibiting the growth of zinc dendrites in a zinc battery. Background technique [0002] Zinc metal is rich in resources in the earth's crust, low in the market price, high in use safety factor, and high in theoretical specific capacity (up to 820mAh g -1 ), low electrochemical potential (-0.762V vs SHE), considered to be one of the ideal anode materials for aqueous batteries. However, when zinc metal is used as a battery electrode, it is also easy to oxidize to form a passivation film, and dendrites grow on the surface to puncture the separator and cause a short circuit of the battery, which affects the cycle performance and service life of the aqueous zinc-based battery. [0003] F.Wang et al. reported that a high-concentration lithium salt mixed with an aqueous zinc salt was used as an electrolyte to assemble a full battery, so that the zinc negative...
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