Search

CN-121983507-A - Modified water-based zinc battery negative electrode and preparation method thereof

CN121983507ACN 121983507 ACN121983507 ACN 121983507ACN-121983507-A

Abstract

The invention belongs to the technical field of batteries, and discloses a modified water-based zinc battery negative electrode and a preparation method thereof. The method comprises the following steps of S1, dissolving zinc sulfate heptahydrate in water to obtain a zinc sulfate solution, S2, dissolving pyridoxal phosphate in water to obtain a pyridoxal phosphate solution, fully soaking a pretreated zinc foil in the pyridoxal phosphate solution, recording as P@Z, washing and drying after soaking is finished, and assembling the symmetrical battery and the full battery by taking P@Z as an electrode, a glass fiber filter membrane as a diaphragm and a zinc sulfate solution as electrolyte. The invention effectively inhibits the problems of corrosion, hydrogen evolution reaction, dendrite growth and the like of zinc to the negative electrode, and has the capability of prolonging the cycle life of the zinc negative electrode.

Inventors

  • XU JIADI
  • A RUHAN
  • ZHANG YING

Assignees

  • 内蒙古工业大学

Dates

Publication Date
20260505
Application Date
20260409

Claims (7)

  1. 1. The preparation method of the modified water-based zinc battery cathode is characterized by comprising the following specific steps: S1, electrolyte preparation Adding water into zinc sulfate heptahydrate to dissolve to obtain zinc sulfate solution; s2, electrode negative electrode preparation Dissolving pyridoxal phosphate in water to obtain pyridoxal phosphate solution, soaking the pretreated zinc foil in pyridoxal phosphate solution, recording as P@Z, washing and drying after soaking; s3, battery assembly P@Z is taken as a negative electrode, a glass fiber filter membrane is taken as a diaphragm, and a zinc sulfate solution is taken as electrolyte, and the paired battery and the full battery are assembled; Both the positive electrode and the negative electrode of the symmetrical battery are P@Z, and only the negative electrode of the whole battery is P@Z.
  2. 2. The method for producing a modified aqueous zinc cell negative electrode according to claim 1, wherein the concentration of the zinc sulfate solution is 1mol/L.
  3. 3. The method for producing a modified aqueous zinc cell negative electrode according to claim 1, wherein the pyridoxal phosphate solution has a concentration of 2 to 5g/L.
  4. 4. The method for preparing the modified water-based zinc battery anode according to claim 1, wherein the pretreatment is to put zinc foil into absolute ethyl alcohol for ultrasonic cleaning for 20min.
  5. 5. The method for producing a modified aqueous zinc cell negative electrode according to claim 1, wherein the time for sufficient soaking is1 to 24 hours.
  6. 6. The method for producing a modified aqueous zinc cell negative electrode according to claim 1, wherein the symmetrical cell and the full cell are CR2032.
  7. 7. The modified aqueous zinc cell negative electrode obtained by the production method according to any one of claims 1 to 6.

Description

Modified water-based zinc battery negative electrode and preparation method thereof Technical Field The invention relates to the technical field of batteries, in particular to a modified water-based zinc battery negative electrode and a preparation method thereof. Background With the acceleration of global industrialization process and the continuous growth of population, the problems of excessive consumption of traditional fossil energy, environmental pollution and climate change caused by the excessive consumption of the traditional fossil energy are more and more serious, and the energy structure transformation becomes a core issue for realizing sustainable development. Under the background, the development of efficient and clean new energy storage technology is particularly important. The electrochemical energy storage system is used as a key component of a new energy system, wherein the battery technology is deeply integrated into the fields of electronic equipment, electric tools, new energy automobiles, smart grid peak shaving and the like due to high energy conversion efficiency and flexible application scenes. However, the conventional rechargeable battery system based on the organic electrolyte generally has problems of high cost, insufficient intrinsic safety, poor environmental compatibility, and the like, and limits the large-scale application thereof. In contrast, aqueous Zinc-Ion Batteries (AZIBs) are considered to be powerful competitors for next generation large scale energy storage systems due to their high safety, low cost, environmental friendliness, and abundance of Zinc resources. However, the commercialization process is severely limited by instability of the zinc cathode interface, and is mainly represented by problems of zinc dendrite, hydrogen Evolution Reaction (HER), corrosion, surface passivation and the like, and the side reactions not only reduce coulombic efficiency, but also lead to short cycle life and potential hidden trouble. Therefore, the modification of the negative electrode is a core research direction for improving the performance of the aqueous zinc battery. The current mainstream negative electrode modification strategy mainly comprises interface protection layer construction, three-dimensional structure design, electrolyte engineering, alloying treatment and the like. In the aspect of interface engineering, an artificial solid electrolyte interface (ARTIFICIAL SEI) is constructed on the surface of the zinc cathode, so that the direct contact between active zinc and electrolyte can be effectively isolated, and side reaction and hydrogen evolution corrosion caused by water can be inhibited. For example, dense coatings formed with organic polymers or inorganic nanomaterials can regulate uniform deposition behavior of Zn 2+, reduce localized current concentrations, and thereby mitigate dendrite formation. In addition, functional molecules (such as polyfuranol) with specific functional groups can form a stable SEI film on the surface of zinc through in-situ polymerization, and experiments prove that the modification can remarkably improve the cycle stability of the symmetrical battery by more than hundreds of hours. Electrolyte additive regulation is another important path, and functional molecules (such as betaine, maltitol and other zwitter ions or polar molecules) are introduced into the electrolyte, so that preferential adsorption can be performed at an electrode-electrolyte interface, an inner Helmholtz layer (IHP) structure is regulated, water molecules are repelled from approaching a zinc surface, HER is further inhibited, and plane deposition of Zn is guided. Research shows that reasonable screening of the additive can achieve coulombic efficiency as high as 99.5%. However, the easy consumption of additives and the insufficient long-term stability remain as technical bottlenecks. In general, although the prior art has remarkable progress, the prior art still has common defects of insufficient mechanical strength of the protective layer, easy breakage, high cost of a three-dimensional structure, complex process, poor long-acting property of the additive and possible capacity sacrifice of alloying. Accordingly, it is a need for a solution to the problem of those skilled in the art to provide a novel method for modifying a negative electrode. Disclosure of Invention In view of the above, the invention provides a modified water-based zinc battery anode and a preparation method thereof, wherein zinc ions are guided to be uniformly deposited by adopting a pyridoxal phosphate anode soaking method, and the process selectively removes high-energy crystal faces, and passivates the surfaces, so that the active surface area is enlarged, the dynamics is enhanced, the electric field is homogenized, and uniform Zn ion flux is guided. At the same time, the thermodynamically stable (002) face is preferentially exposed, leading Zn to deposit along the (002) orientation, inhibit