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Preparation method of gel electrolyte for double cross-linked water system metal ion energy storage device
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A gel electrolyte, metal ion technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve problems such as limiting battery processing performance, achieve high ionic conductivity and mechanical strength, good mechanical strength, The effect of simple production process
Active Publication Date: 2022-03-25
NANJING FORESTRY UNIV
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Problems solved by technology
Although zinc-ion batteries using zinc salt aqueous solution as the electrolyte can overcome the safety problems brought about by organic electrolytes, the use of aqueous solutions greatly limits the processability of batteries.
Method used
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Embodiment 1
[0021] (1) Mix cellulose nanofibers, acrylamide, allyl polyethylene glycol, methylenebisacrylamide, potassium persulfate and water in a mass ratio of 1:0.5:0.5:0.05:0.005:20 to form Mixed dispersions of cellulose nanofibers.
[0022] (2) The mixed solution in (1) was uniformly coated on a glass plate with a coating thickness of 100 μm.
[0023] (3) The glass plate described in (1) is heated to 60° C. and reacted for 2 hours to obtain a cellulose / cross-linked polyacrylamide mixed film.
[0024] (4) The mixed membrane described in (3) was soaked in a 1 mol / L zinc nitrate aqueous solution for 2 hours to obtain a double-crosslinked aqueous zinc ion gel electrolyte with a thickness of 50 μm.
Embodiment 2
[0026] (1) Mix cellulose nanofibers, acrylamide, polyethylene glycol methacrylate, methylenebisacrylamide, potassium persulfate and water in a mass ratio of 1:1:1:0.1:0.01:20 A mixed dispersion of cellulose nanofibers is formed.
[0027] (2) The mixed solution described in (1) was uniformly coated on a glass plate with a coating thickness of 200 μm.
[0028] (3) The glass plate described in (1) is heated to 70° C. and reacted for 2 hours to obtain a cellulose / cross-linked polyacrylamide mixed film.
[0029] (4) The mixed membrane described in (3) was soaked in a 2 mol / L zinc acetate aqueous solution for 6 hours to obtain a double-crosslinked aqueous zinc ion gel electrolyte with a thickness of 100 μm.
Embodiment 3
[0031] (1) Mix cellulose nanofibers, acrylamide, polyethylene glycol acrylate, methylenebisacrylamide, potassium persulfate and water in a mass ratio of 1:1.5:1.5:0.15:0.015:20 to form fibers Mixed dispersions of plain nanofibers.
[0032] (2) The mixed solution in (1) was uniformly coated on a glass plate with a coating thickness of 400 μm.
[0033] (3) The glass plate described in (1) is heated to 60° C. and reacted for 2 hours to obtain a cellulose / cross-linked polyacrylamide mixed film.
[0034] (4) The mixed membrane described in (3) was immersed in a 3 mol / L zinc sulfate aqueous solution for 4 hours to obtain a double-crosslinked aqueous zinc ion gel electrolyte with a thickness of 250 μm.
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Abstract
The invention discloses a preparation method of a gel electrolyte for a double-crosslinked water-based metal ion energy storage device, comprising the following steps: (1) mixing cellulose nanofibers, acrylamide, polyethylene glycol derivatives, methylene bismuth Acrylamide, potassium persulfate and water are mixed in a mass ratio of 1:0.5~1.5:0.5~1.5:0.05~0.15:0.005~0.015:20 to form a mixed dispersion of cellulose nanofibers; (2) mixing step (1) ), the mixed solution is uniformly coated on a glass plate, heated to 60-80° C. for a period of time to obtain a cellulose / cross-linked polyacrylamide mixed film of the required thickness; (3) the mixed film described in step (2) is applied Soak in an aqueous solution of metal salt for 2 to 6 hours to obtain a double-crosslinked aqueous metal ion gel electrolyte. The invention has the advantages of simple production process, high production efficiency and low energy consumption, the prepared electrolyte is thinner, still maintains high ionic conductivity and mechanical strength, and can meet the use of flexible metal ion energy storage devices.
Description
technical field [0001] The invention relates to a preparation method of a gel electrolyte for a double-crosslinked aqueous metal ion energy storage device, and belongs to the technical field of batteries. Background technique [0002] Lithium-ion batteries are currently the most widely used commercial energy storage devices with high energy density and long cycle life. However, due to the use of organic electrolytes, lithium-ion batteries have safety problems such as leakage and explosion. At the same time, lithium metal reserves are small and equipment requirements are high, resulting in high cost of lithium-ion batteries. In order to overcome the above-mentioned disadvantages, it is therefore necessary to develop new types of batteries. [0003] As an active metal, zinc has a standard potential of -0.762V (vs. SHE), and the theoretical mass specific capacity and volume specific capacity are 820mAh / g and 5855mAh / cm, respectively 3 (Adv.Funct.Mater.2018, 1802564), and abu...
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