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CN-122025861-A - Double-doped polyacrylamide gel electrolyte and preparation method and application thereof

CN122025861ACN 122025861 ACN122025861 ACN 122025861ACN-122025861-A

Abstract

The invention discloses a double-doped polyacrylamide gel electrolyte, a preparation method and application thereof, wherein the gel electrolyte is sodium alginate and sodium lignin sulfonate double-doped polyacrylamide gel electrolyte, high ion conductivity, high mechanical strength and low short circuit risk are realized, the electrolyte has multiple advantages of stable electrode/electrolyte interface, dendrite growth inhibition, stable circulation, green degradation and the like, and the electrolyte is simple in preparation process, good in reproducibility and suitable for large-scale production of long-life, high-safety and low-cost environment-friendly zinc ion batteries.

Inventors

  • CHEN YINGYING
  • CHEN HAIFENG
  • WAN JIXIANG
  • YANG HONGXUN

Assignees

  • 江苏科技大学

Dates

Publication Date
20260512
Application Date
20260310

Claims (10)

  1. 1. The double-doped polyacrylamide gel electrolyte is characterized in that the gel electrolyte is prepared by forming a gel network through polymerization reaction of sodium alginate, sodium lignin sulfonate, acrylamide, a cross-linking agent and an initiator and dipping a zinc salt solution.
  2. 2. The double-doped polyacrylamide gel electrolyte according to claim 1, wherein the gel electrolyte, sodium alginate and polyacrylamide form an interpenetrating or semi-interpenetrating network, the double-doped polyacrylamide gel electrolyte has high elasticity of the polyacrylamide and rigid support of the sodium alginate, and sodium lignin sulfonate introduces an anionic group sulfonate.
  3. 3. A method for preparing the double-doped polyacrylamide gel electrolyte according to claim 1, which comprises the following steps: (1) Sodium alginate is dissolved in water to prepare sodium alginate solution, wherein the mass fraction of sodium alginate in the sodium alginate solution is 0.80% -1.98%; (2) Adding sodium lignin sulfonate, acrylamide, a cross-linking agent and an initiator into a sodium alginate solution, and stirring to obtain a mixed solution, wherein the mass fraction of the sodium lignin sulfonate in the mixed solution is 0.25% -1.07%; (3) Injecting the mixed solution into a die with the depth of 0.5 mm, covering a glass plate, sealing, and then placing the glass plate in an oven for reaction to obtain double-doped polyacrylamide gel; (4) And soaking the double-doped polyacrylamide gel in zinc sulfate solution for reaction, and taking out to obtain the double-doped polyacrylamide gel electrolyte.
  4. 4. The method according to claim 3, wherein in the step (1), the sodium alginate solution is prepared by dissolving sodium alginate in water, stirring at 300-500rpm for 1-2 hours, and then performing ultrasonic treatment in a 200-500W ultrasonic apparatus for 0.5-1 hour.
  5. 5. The preparation method according to claim 3, wherein in the step (2), the mass percentage of sodium lignin sulfonate, acrylamide, initiator and cross-linking agent is 0.25% -1.07%, 27.06% -50.20%, 1.15% -4.21%, and 0.23% -0.86%.
  6. 6. A method according to claim 3, wherein in step (3), the drying condition is 60 to 70 ℃, and the heating is performed in an oven for 3 to 4 hours.
  7. 7. The method according to claim 3, wherein in the step (4), the reaction time is 2 to 3 hours, and the concentration of the zinc sulfate solution is 2 to 4 mol/L.
  8. 8. Use of the double-doped polyacrylamide gel electrolyte according to claim 1 in an aqueous zinc ion battery.
  9. 9. The use according to claim 8, wherein the aqueous zinc-ion cell is a CR2025 button zinc-ion cell.
  10. 10. The method according to claim 8, wherein the method for manufacturing the aqueous zinc-ion battery comprises the steps of punching gel electrolyte into a wafer to serve as a diaphragm, punching zinc foil into a wafer to serve as a positive electrode and a negative electrode, and sequentially placing the zinc negative electrode, the gel electrolyte diaphragm and the zinc positive electrode in a CR2025 battery shell to assemble the paired battery.

Description

Double-doped polyacrylamide gel electrolyte and preparation method and application thereof Technical Field The invention relates to a double-doped polyacrylamide gel electrolyte, and also relates to a preparation method of the gel electrolyte and application of the gel electrolyte serving as a water-based zinc ion battery in the field of energy materials. Background Zinc ion batteries are an emerging candidate technology for large-scale energy storage application, and are rapidly developed in recent years by virtue of the outstanding advantages of intrinsic safety, abundant resources, low cost and environmental friendliness, and are currently in an early stage of going from laboratories to industrialized application. As a key component of zinc ion batteries, electrolytes have been the focus of research. Currently, the research of zinc ion battery electrolyte is changing from single performance optimization in the past to systematic collaborative design from micro solvation structure and interface regulation to macroscopic morphology design, and the core aim is to synchronously solve key problems of zinc negative pole dendrite, side reaction, positive pole dissolution and the like. "A both microscopically and macroscopically intrinsic self-healing long lifespan yarn battery"（Energy Storage Mater. 2020, 28, 334-341）, A PAM/sodium alginate double-network gel electrolyte is reported, although the research successfully realizes the self-repairing function of the gel electrolyte through a dynamic crosslinking strategy, inhibits the growth of zinc dendrites and prolongs the cycle life of a battery, the research is only carried out in the direction of electrochemical-mechanical stability, the prior art still lacks the absolute value of ion conductivity and the optimization of microscopic ion transmission dynamics, and 'Lean-water hydrogel electrolyte for zinc ion batteries' (Nat. Commun. 2023, 14, 3890) is carried out, and the research successfully solves the key problem of ion transmission blockage under the condition of poor water by introducing a PAM gel modified by sulfonic acid groups and utilizing a unique 'molecular lubrication mechanism', and obviously improves the ion conductivity and the transmission dynamics, thereby realizing the ultra-long cycle life while inhibiting side reactions. However, the core contribution of the work is the optimization of electrochemical performance, the intrinsic mechanical properties (such as tensile strength and fracture toughness) of the electrolyte are still to be further optimized and improved, and a new gel electrolyte with high ionic conductivity, high mechanical strength and low short-circuit risk is to be developed, so that the mass production of the environment-friendly zinc ion battery with long service life, high safety and low cost is promoted. Disclosure of Invention The invention aims to provide a Sodium Alginate (SA) and Sodium Lignin Sulfonate (SLS) double-doped Polyacrylamide (PAM) gel electrolyte, and also provides a preparation method of the gel electrolyte and application of the gel electrolyte serving as a water-based zinc ion battery in the field of energy materials. The technical scheme is that the double-doped polyacrylamide gel electrolyte is prepared by forming a gel network through polymerization reaction of sodium alginate, sodium lignin sulfonate, acrylamide, a cross-linking agent and an initiator, and dipping a zinc salt solution. The sodium alginate and the polyacrylamide can form an interpenetrating or semi-interpenetrating network, and the sodium alginate has the high elasticity of the polyacrylamide and the rigid support of the sodium alginate, and a large amount of anionic group sulfonic groups are introduced into the sodium lignin sulfonate added into the solution, so that the ion conductivity of the gel electrolyte is improved. The preparation method of the double-doped polyacrylamide gel electrolyte comprises the following steps: (1) Sodium alginate is dissolved in water to prepare sodium alginate solution, wherein the mass fraction of sodium alginate in the sodium alginate solution is 0.80% -1.98%; (2) Adding sodium lignin sulfonate, acrylamide, a cross-linking agent and an initiator into a sodium alginate solution, and stirring to obtain a mixed solution, wherein the mass fraction of the sodium lignin sulfonate in the mixed solution is 0.25% -1.07%; (3) Injecting the mixed solution into a die with the depth of 0.5 mm, covering a glass plate, sealing, and then placing the glass plate in an oven for reaction to obtain double-doped polyacrylamide gel; (4) And soaking the double-doped polyacrylamide gel in zinc sulfate solution for reaction, and taking out to obtain the double-doped polyacrylamide gel electrolyte. Wherein, in the step (1), the preparation of the sodium alginate solution is specifically to dissolve sodium alginate in water, stir for 1-2 hours at 300-500 rotational speed, and then carry out ultrasonic treatment for 0.5-1 hou