50 results about "Polyiodide" patented technology

The invention relates to an aqueous zinc-iodine battery electrolyte containing a phenolic additive, and a preparation method and application thereof, and belongs to the technical field of aqueous zinc-iodine batteries. The invention aims to solve the technical problems of serious multi-iodide shuttling and negative electrode by-products of the existing aqueous zinc-iodine battery. The preparation method of the aqueous zinc-iodine battery electrolyte containing the phenolic additive comprises the following steps: dissolving zinc salt and the phenolic additive in deionized water, and fully stirring and mixing to obtain the aqueous zinc-iodine battery electrolyte containing the phenolic additive. The phenolic additive used in the application can accelerate conversion from I3-to I-, accelerate iodine conversion reaction kinetics and reduce generation of polyiodide, so that shuttling of the polyiodide is effectively inhibited, a phenolic additive monomer is adsorbed on the surface of a zinc negative electrode, contact between Zn < 2 + > and water molecules is reduced, and generation of zinc negative electrode by-products is inhibited; the zinc-iodine battery also has the advantages of being easy to manufacture and low in cost.

The invention relates to the technical field of energy storage, in particular to an iron monatomic modified carbon nanotube array, a preparation method and application of the iron monatomic modified carbon nanotube array in an aqueous zinc-iodine battery, simple and convenient solid-phase reaction and high-temperature carbonization strategies are adopted, carbon cloth serves as a substrate, ferric acetylacetonate, boric acid, polyethylene glycol and urea serve as an iron source, a boron source, a carbon source and a nitrogen source respectively, and the iron monatomic modified carbon nanotube array is prepared. And after high-temperature calcination, growing an iron monatomic modified carbon nanotube array on the carbon cloth in situ. The iron single atom not only enhances the chemical capture capability of the carbon nanotube on the polyiodide, but also promotes the oxidation-reduction conversion of iodine; the carbon nanotube array provides a physical space for limited adsorption of iodine species and effectively promotes ion diffusion. Therefore, the obtained water-based zinc-iodine battery shows high specific capacity and good cycling stability. The whole technological process is simple and convenient to operate, has industrial application prospects, and provides a novel preparation method for the carbon-based iodine positive electrode host material of the aqueous zinc-iodine battery.

The invention relates to the technical field of electrode materials, in particular to a wide-temperature-range high-iodine-loading positive electrode material, a preparation method thereof and a zinc-iodine battery. The method comprises the following steps: mixing activated carbon and iodine simple substance, and heating to sublimate and embed the iodine simple substance into the activated carbon to obtain iodine-loaded carbon black I2-coated CB; mixing gelatin and an acetic acid solution to obtain a gelatin binder solution; mixing the iodine-loaded carbon black I2-coated CB, a conductive agent and a gelatin binder solution to obtain iodine positive electrode slurry; and coating a stainless steel mesh with the iodine positive electrode slurry, and drying to obtain the wide-temperature-range high-iodine-loading positive electrode material. According to the wide-temperature-range high-iodine-load positive electrode material prepared by the method, active functional groups such as peptide bonds, carboxyl groups and amino groups of gelatin in the gelatin binder solution are utilized, the constraint capability on active iodine and the chemical adsorption effect on polyiodide are utilized, and therefore the problems of active iodine dissolution and polyiodide shuttling are effectively inhibited.

The invention relates to an iodine-loaded positive electrode for a zinc-iodine battery and a preparation method and application of the iodine-loaded positive electrode, and belongs to the technical field of positive electrode materials for zinc-iodine batteries. The preparation method of the iodine-loaded positive electrode for the zinc-iodine battery comprises the following steps: mixing an iodine-loaded carbon material, conductive carbon black, a polysaccharide binder and deionized water in proportion, grinding into slurry, uniformly coating a current collector with the slurry, and drying to obtain the iodine-loaded positive electrode for the zinc-iodine battery. As the polysaccharide binder is rich in a large number of active functional groups (hydroxyl, carboxyl and the like), dissolution of active iodine and a shuttle effect of polyiodide can be inhibited through a chemical adsorption effect, corrosion to a zinc negative electrode caused by attenuation of battery capacity and shuttle of the polyiodide is avoided, and the polysaccharide binder has a good application prospect in the zinc-iodine battery.

The invention relates to an electrolyte for synergistically stabilizing positive electrode iodine multi-electron reaction through four-combination zinc salt and a high-surface-capacity zinc-iodine soft package battery. The electrolyte comprises the four-combination zinc salt and water, in the electrolyte, the total concentration of zinc ions in the four combinations of zinc salts is 2 + / -0.2 mol / L; the four-combination zinc salt is a four-combination zinc salt; the SO4 < 2-> in the electrolyte buffers the pH value of a system, so that side reaction of a negative electrode is reduced; cH3COO <-> can be cross-linked with I3 <->, so that shuttling of polyiodide is inhibited, and reversibility of a two-electron reaction is enhanced; bromide ions Br <-> in the electrolyte are chemically combined with I < + > through isohalogen to excite four-electron reaction; the trifluoromethanesulfonate OTf <-> with strong electronegativity surrounds the positive electricity I < + > by virtue of an ion atmosphere effect, so that active water molecule attack hydrolysis failure is avoided, a synergistic stable positive electrode iodine multi-electron reaction is realized, and the high-surface-capacity zinc-iodine soft package battery is beneficial to promoting the development of the zinc-iodine battery to practical application.

The invention discloses a battery electrolyte and a preparation method thereof, an aqueous zinc-iodine battery and terminal equipment. The battery electrolyte comprises an additive, an electrolyte and a solvent, the additive contains an amino functional group, and the concentration of the additive is 0.1 g / L-0. 5 g / L. In addition, the additive can also utilize a nitrogen-containing functional group to reduce the shuttle effect of polyiodide and prevent the loss of an iodine positive active material, so that the electrode of the zinc ion battery is protected, and the cycle life of the zinc ion battery is remarkably prolonged (the capacity is about 20mAh / g higher than that of an electrolyte without L-tyrosine).

The invention discloses a zinc-iodine battery positive electrode material and a preparation method and application thereof, the zinc-iodine battery positive electrode material comprises carbon cloth, a covalent organic framework and an active substance, the covalent organic framework is 8F-COF, the covalent organic framework 8F-COF grows on the carbon cloth in situ, and the active substance is adsorbed on the carbon cloth. The material is flexible and self-supporting, energy storage is further improved, the service life of the zinc-iodine battery is further prolonged, an 8F-COF material is grown on carbon cloth in situ, 8F-COF has a microporous structure containing F atoms, when polyiodide ions pass through the porous structure, the 8F-COF connects polyiodide to a polymer skeleton through an aromatic nucleophilic substitution reaction, and thus the energy storage capacity of the zinc-iodine battery is improved. The iodide is effectively inhibited through space and electrostatic hindering, and the shuttle effect is reduced. And after being loaded with iodine, the material can be directly used as an electrode material without adding any conductive agent and binder.

The invention relates to an aqueous zinc-iodine battery electrolyte containing an amino acid additive and a preparation method and application thereof, and belongs to the technical field of aqueous zinc-iodine batteries. The preparation method of the aqueous zinc-iodine battery electrolyte containing the amino acid additives comprises the following steps: fully stirring and mixing zinc salt, D-penicillamine and deionized water according to a certain proportion to obtain the aqueous zinc-iodine battery electrolyte containing the amino acid additives. The amino acid-containing additive D-penicillamine used in the invention is preferentially coordinated with I-, and due to the lack of free I-in the reaction, the generation of polyiodide and the dissolution of I2 are inhibited, so that the shuttle effect is inhibited; the amino acid-containing additive D-penicillamine also participates in a Zn < 2 + > solvation sheath layer, so that the tendency of desolvation and Zn < 2 + > migration is improved, and the generation of zinc negative electrode byproducts is inhibited; in addition, the aqueous zinc-iodine battery electrolyte containing the amino acid additive D-penicillamine is simple in preparation method and low in cost.

The invention provides a water-based composite electrolyte and a preparation method and application thereof. The water-based composite electrolyte comprises soluble zinc salt, amino acid hydrochloride additives and deionized water. The aqueous composite electrolyte can be used for a symmetrical button cell, a half cell or an aqueous zinc ion total cell. By adjusting zinc ion deposition on the surface of the zinc electrode, the growth of zinc dendrites is reduced, and the shuttle effect of the iodine positive electrode is inhibited, so that the coulombic efficiency and the cycle performance of the water-based zinc-iodine battery are improved. The additive disclosed by the invention can be adsorbed on the surface of a zinc negative electrode, delays the nucleation process and inhibits the growth of zinc dendrites; the form of hydrochloride can play a role of a buffer solution, stabilize the pH value of the electrolyte, inhibit the corrosion of the zinc negative electrode and reduce the hydrogen evolution reaction; the hydrochloride form can weaken the protonation effect of amino acid groups and enhance the electrostatic interaction between the amino acid groups and the polyiodide, so that the shuttle effect is inhibited, and the coulombic efficiency and the cycle performance of the aqueous zinc-iodine battery are improved.

This invention discloses a zinc-iodine battery and an electrode carrier that can simultaneously suppress polyiodine ion shuttle and regulate zinc deposition behavior, wherein the electrode carrier is Cu. + Coordinated poly(3,4-ethylenedioxythiophene) (Cu-PEDOT), via a solvothermal method, to convert Cu... + It was prepared by coordinating with S atoms in the PEDOT framework. I₂ was loaded onto this support as the positive electrode, and Zn was electrochemically deposited as the negative electrode to assemble a battery. The atomically monodisperse Cu in this invention... + It not only enhances the chemisorption of polyiodides as a Lewis active site, but also significantly reduces I... ‑ / I 0 Conversion energy barrier, accelerates reaction kinetics and suppresses shuttle effect; at the same time, Cu + The zinc-affinity property of the substrate reduces the Zn nucleation overpotential, guides Zn to deposit uniformly along the (002) crystal plane, and suppresses dendrites. Zinc-iodine batteries based on this substrate exhibit excellent rate performance and ultra-long cycle stability, and achieve dendrite-free negative electrode growth even under high depth-of-discharge conditions. This invention solves the problem of simultaneous multi-iodide shuttle in the positive electrode and zinc dendrite growth in the negative electrode using a single substrate, significantly improving the energy density and cycle life of the battery.

The present invention relates to the technical field of electrode materials, and specifically to a wide-temperature-range high-iodine-loaded positive electrode material, a preparation method thereof, and a zinc-iodine battery. Activated carbon and iodine element are mixed and then subjected to a heat treatment to sublime the iodine element and embed it into the activated carbon, thereby obtaining iodine-loaded carbon black I2@CB; gelatin and acetic acid solution are mixed to obtain a gelatin binder solution; iodine-loaded carbon black I2@CB, a conductive agent, and the gelatin binder solution are mixed to obtain an iodine positive electrode slurry; the iodine positive electrode slurry is coated on a stainless steel mesh and dried to obtain a wide-temperature-range high-iodine-loaded positive electrode material. The wide-temperature-range high-iodine-loaded positive electrode material prepared by the present invention effectively suppresses the problems of active iodine dissolution and polyiodide shuttling by utilizing the active functional groups of gelatin in the gelatin binder solution, such as peptide bonds, carboxyl groups, and amino groups, to restrain active iodine and chemically adsorb polyiodides.

The invention belongs to the technical field of secondary batteries, and particularly relates to a zinc-iodine battery electrolyte additive with pH buffering and multi-iodide shuttle effect inhibiting capabilities. In order to effectively improve the performance of the zinc ion battery and prolong the service life of the zinc ion battery, the invention provides an aqueous zinc ion battery electrolyte additive, and the electrolyte additive is a zwitterionic polyelectrolyte, can inhibit hydrogen evolution and buffer the pH value, and also can reduce the shuttle effect of polyiodide. Meanwhile, the zwitterionic polyelectrolyte is introduced into the electrolyte to assemble the water-based zinc-iodine battery, so that the cycle life of the water-based zinc-iodine battery can be greatly prolonged, and the stable coulombic efficiency of the water-based zinc-iodine battery can be ensured.

The disclosure relates to an ionic liquid additive that is useful in an electrolyte solution for an electrochemical device. The ionic liquid additive is capable of interacting with polyiodide and / or polybromide species to mitigate shuttle effect for the electrochemical device and stabilise the positive electrode and the negative electrode of the electrochemical device.

The invention relates to a catalytic quasi-solid ionic conductor, a preparation method and application thereof, and an aqueous zinc ion battery, and belongs to the field of aqueous zinc ion battery electrolyte preparation. The preparation method of the catalytic quasi-solid ionic conductor comprises the following steps: mixing ZSM-5 molecular sieve powder with a metal nitrate solution, carrying out a hydrothermal reaction, centrifuging, washing and drying after the reaction is completed to obtain a monatomic-loaded molecular sieve, then preparing the monatomic-loaded molecular sieve into a sheet, dropwise adding a trace amount of electrolyte for infiltration, and drying to obtain the catalytic quasi-solid ionic conductor. The catalytic quasi-solid ionic conductor is obtained. The catalytic quasi-solid ionic conductor has the following advantages: (1) rich monatomic catalytic sites can accelerate iodine conversion, reduce accumulation of polyiodide, and inhibit the shuttle effect through strong adsorption, thereby avoiding capacity fading and cathode corrosion; (2) molecular sieve pore channels can limit the activity of water molecules and inhibit side reactions; (3) zinc ions can be guided to be uniformly deposited, and dendritic crystal growth is inhibited; and (4) the cathode material has good adaptability.

The invention relates to the technical field of zinc-iodine batteries, and provides preparation of a high-iodine-loading nitrogen-oxygen double-doped carbon material composite positive electrode and application of the high-iodine-loading nitrogen-oxygen double-doped carbon material composite positive electrode in a zinc-iodine battery. A working electrode with a high iodine loading capacity PONC / I2 composite material (PONC / I2) as an active substance is prepared, nitrogen-oxygen double-doped hierarchical porous carbon (PONC) is prepared by taking polydopamine gel as a precursor and performing high-temperature calcination, and multi-dimensional optimization of'pore structure and double-element synergy 'is combined. The strong interface chemistry brought by the rich N / O dopant on the hierarchical porous structure enhances the adsorption of iodine substances, realizes the high load of iodine, promotes the catalytic conversion kinetics of iodine and polyiodide, and relieves the capacity fading caused by the shuttle effect of the polyiodide intermediate. The capacity of the prepared positive electrode material is still kept at 60-80mAh g <-1 > after the positive electrode material is circulated for 65000 times at the current density of 10A g <-1 >, and the positive electrode material has excellent rate capability and long cycle stability.

This invention belongs to the field of electrochemical battery technology, specifically relating to an electrolyte that can be used in the four-electron conversion reaction of an aqueous zinc-iodine battery. The electrolyte comprises a zinc salt, deionized water, an organic solvent, and an organic halide salt. This invention utilizes pyridine cations to pretreat the charge distribution of tribromide ions, reducing polyiodide shuttle, and under high voltage, through reaction with I... + Strong interaction, excites and stabilizes I 0 / I + Redox couples, realizing I ‑ / I 0 / I + The reversible four-electron conversion reaction enhances battery capacity. On the zinc anode side, the activity of water is weakened by an organic solvent, while pyridine cations preferentially adsorb onto its surface, suppressing competitive water adsorption, inhibiting zinc dendrite formation and hydrogen evolution side reactions, thus protecting the zinc metal anode. This simultaneously achieves activation of the four-electron reaction at the cathode and protection of the anode interface. Consequently, the zinc-iodine battery achieves excellent rate performance, outstanding cycle stability, and high reversible capacity.

The application discloses a kind of bottle-in-bottle structure silver porous carbon composite material as zinc iodine battery positive carrier and its preparation and application in zinc iodine battery positive electrode.The bottle-in-bottle structure silver porous carbon composite material Ag@KJ600 is synthesized by ultrasonic immersion method, dried, calcined, ground with I2 in argon protection environment, sealed and heated for 12 hours to obtain Ag@KJ600 / I2.When the composite material is used as iodine positive carrier, it can chemically adsorb polyiodide formed during the cycle process, inhibit the shuttle effect of polyiodide, and further reduce the corrosion of negative zinc and the loss of active material.Ag@KJ600 / I2 active material can be applied to zinc iodine battery iodine positive electrode, and excellent electrochemical performance is shown.

The invention belongs to the technical field of aqueous batteries, and discloses a preparation method of an ant nest-shaped carbon material and a zinc-iodine soft package battery. The preparation method comprises the following steps: (1) preparing a ZIF-8 material from zinc nitrate hexahydrate and 2-methylimidazole; (2) calcining the material prepared in the step (1) to obtain an ant nest-shaped carbon material; the zinc-iodine soft package battery comprises a zinc foil negative electrode, an ant nest-shaped carbon material positive electrode, a glass fiber diaphragm and an electrolyte, the obtained ant nest-shaped carbon material has a high specific surface area and a rich pore structure, can effectively bear and limit an iodine active substance, and improves the effective utilization rate of an iodine simple substance; the dissolution and diffusion of intermediate product polyiodide ions can be limited, and the shuttle effect is inhibited; the price is low, the preparation method is simple and convenient, and the repeatability is high; and the aqueous electrolyte and the graphite paper current collector are adopted, so that dangerous conditions such as combustion or explosion and the like are not easy to occur. And meanwhile, the application of the graphite paper current collector shows the trend of increasing the energy density.

The invention relates to a zinc-iodine battery positive electrode binder, a zinc-iodine battery positive electrode plate based on the binder and a preparation method and application of the zinc-iodine battery positive electrode plate, and belongs to the technical field of battery binder materials. The invention aims to solve the technical problem of serious multi-iodide shuttling of the existing water-based zinc-iodine battery. The preparation method of the zinc-iodine battery positive pole piece based on the binder comprises the following steps: dissolving an active substance, a conductive agent and the binder in water according to a certain proportion, and uniformly mixing to obtain black pasty slurry; and uniformly smearing the black pasty slurry on a current collector, and naturally airing in air to obtain the battery positive pole piece. The sodium lignin sulfonate is used as the positive electrode binder of the aqueous zinc-iodine battery, so that corrosion of polyiodide to a zinc negative electrode is reduced, the service life of the battery is prolonged, and the initial capacity and cycling stability of the battery are improved.

The application belongs to the technical field of water-based zinc-iodine battery materials, and specifically discloses a MOF-derived iron-vacancy-containing sulfide spinel composite material. The material precisely regulates the d-band center of Fe through iron vacancies, weakens the Fe-S bond strength, significantly improves the adsorption capacity for polyiodide and the redox reaction kinetics, and simultaneously induces the formation of a thin and dense inorganic-rich stable interface layer. In combination with an in-situ generated N / S co-doped porous carbon framework, the composite material effectively inhibits particle agglomeration and accelerates ion and electron transmission. The composite material as a zinc-iodine battery positive electrode realizes a reversible specific capacity of 182.94 mAh / g and a coulombic efficiency of 95.2% at a current density of 2 A / g, and has a capacity retention rate of up to 98.2% after 1000 cycles at 0.2 A / g, thereby exhibiting excellent high-rate charge and discharge capacity and long cycle stability, and having a good application prospect in low-cost, high-safety and long-life water-based energy storage devices.

The invention belongs to the technical field of electrochemistry, and particularly relates to a strong polar group modified hydrogel electrolyte as well as a preparation method and application thereof. The preparation method of the hydrogel electrolyte comprises the following steps: modifying dimethylaminoethyl methacrylate with a strong polar group to obtain dimethylaminoethyl methacrylate modified by the strong polar group; the preparation method comprises the following steps: mixing dimethylaminoethyl methacrylate modified by a strong polar group, acrylamide and zinc salt, adding a cross-linking agent and an initiator to obtain a mixed solution, and performing ultraviolet irradiation on the mixed solution to obtain the water-soluble polymer. The strong polar group is any one of a bromomethyl trifluoroborate group, an iodomethyl trifluoroborate group, a boron trifluoride methyl ether group and an ethyl trifluoroborate group. According to the hydrogel electrolyte, the shuttle effect of polyiodide is effectively inhibited, construction of a stable and efficient ion migration channel is facilitated, zinc is guided to preferentially grow along the crystal face, and growth of zinc dendrites is effectively inhibited.

This invention relates to the field of aqueous battery materials technology, and discloses a zinc-iodine battery electrode material based on MXene-confined iodoene and its preparation method. The electrode material is made of a mixture of few-layer MXene, few-layer iodoene, and multi-walled carbon nanotubes. In the microstructure, multi-walled carbon nanotubes are interspersed between the few-layer MXene sheets to construct a long-range continuous hybrid conductive network; the few-layer iodoene is spatially confined within the two-dimensional sheet channels of the few-layer MXene. During preparation, a flexible, self-supporting film without binder is directly formed through liquid-phase mixing, ultrasonic self-assembly, and vacuum filtration. This invention utilizes multi-walled carbon nanotubes to improve the electronic conductivity of elemental iodine, and through the size exclusion effect of the interlayer channels of few-layer MXene and the chemical coordination of its surface polar functional groups (-OH, -O, -F), it provides a physical barrier and chemical anchoring for polyiodides, suppressing the shuttle effect and improving the battery cycle stability and energy density.

The invention discloses a polyimide iodine positive electrode material with double functions of chemical adsorption and electrostatic confinement and application of the polyimide iodine positive electrode material in an aqueous zinc-iodine battery, and belongs to the technical field of aqueous zinc-iodine batteries. The polyimide iodine positive electrode material comprises a polyimide main chain with a pi conjugated structure and a positive charge group introduced into a molecular structure. Positive charge groups can effectively limit the range of polyiodide anions through electrostatic interaction, iodide ions serving as counter ions of the positive charge groups are fixed in a polyimide molecular structure and serve as an electrochemically active iodine source to participate in electrochemical reaction, and the polyimide iodine positive electrode material can be used for preparing the positive electrode material through synergism of chemical adsorption and electrostatic range limiting. The shuttle effect of the polyiodide is effectively inhibited. The polyimide iodine positive electrode material has good charge transfer capability and a confinement stabilizing effect on iodine species, and the cycling stability and the rate capability of the positive electrode material can be remarkably improved in an aqueous zinc-iodine battery.

The invention provides a starch integrated catalyst / linear sulfur integrated aqueous zinc-sulfur battery positive electrode material and a preparation method thereof.The method comprises the steps that starch, sulfur and ketjen black are weighed and mixed to be uniform, and a mixture is obtained; calcining the mixture under a vacuum condition to prepare a starch / sulfur / ketjen black composite material; and finally, soaking the obtained composite material in a polyiodide aqueous solution until the supernate becomes colorless, centrifuging and drying to obtain the starch integrated catalyst / linear sulfur integrated aqueous zinc-sulfur battery positive electrode material. The iodine is fixed in a starch double helix structure through hydrogen bond interaction between iodine and a starch polyhydroxy structure on the basis of a chromogenic reaction of starch and iodine, the shuttle effect of polyiodide is inhibited, the iodine catalyst is effectively enriched on the positive electrode side, and the catalytic oxidation capacity of the iodine catalyst is maximized. The prepared positive electrode material has the advantages of high specific energy, high magnification and high stability, and can meet the application requirements of the future energy storage market.

The invention relates to a three-dimensional self-supporting skeleton and a preparation method and application thereof, and the method comprises the following steps: respectively dispersing a conductive polymer, a two-dimensional conductive material and a conductive agent in a solvent, and carrying out ultrasonic dispersion to obtain a uniform solution A, a uniform solution B and a uniform solution C; mixing the solution A, the solution B and the solution C according to a certain volume ratio, and ultrasonically dispersing uniformly to obtain a mixed solution; and carrying out suction filtration on the mixed solution, and freeze-drying to obtain the three-dimensional self-supporting skeleton. The prepared three-dimensional self-supporting framework is applied to preparation of an iodine positive electrode carrier, and elemental iodine is loaded in a thermal adsorption mode to prepare the iodine positive electrode carrier. The invention discloses an aqueous zinc-iodine battery which comprises a negative electrode, a diaphragm, electrolyte and an iodine positive electrode carrier serving as an iodine positive electrode plate, when the iodine positive plate is applied to the aqueous zinc-iodine battery, the iodine loading capacity can be improved, the structural stability of the positive electrode can be enhanced, the shuttle effect of polyiodide can be effectively inhibited, the self-discharge effect can be avoided, the capacity loss of the iodine positive electrode can be reduced, and the cycle life of the zinc-iodine battery can be prolonged.

The application belongs to the technical field of electrochemistry, and particularly relates to a strong polar group modified hydrogel electrolyte and a preparation method and application thereof. The hydrogel electrolyte is obtained by modifying a strong polar group on dimethylaminoethyl methacrylate to obtain strong polar group modified dimethylaminoethyl methacrylate; the strong polar group modified dimethylaminoethyl methacrylate, acrylamide and a zinc salt are mixed, a crosslinking agent and an initiator are added to obtain a mixed solution, and the mixed solution is obtained through ultraviolet irradiation; the strong polar group is any one of a bromomethyl trifluoroboron group, an iodomethyl trifluoroboric acid group, a boron trifluoride dimethyl ether group and an ethyl trifluoroboric acid group. The hydrogel electrolyte in the application effectively inhibits the shuttle effect of polyiodide, is conducive to the construction of a stable and efficient ion migration channel, guides the zinc to grow along a crystal face in a preferential manner, and effectively inhibits the growth of zinc dendrites.

The invention discloses a method for inhibiting shuttling of polyiodide in a zinc-iodine battery, and belongs to the technical field of polysaccharide gel and zinc-iodine batteries. Aiming at the problem of shuttling of polyiodide in the existing zinc-iodine battery, transparent polysaccharide gel is prepared from a polysaccharide substance by a physical crosslinking method or a chemical crosslinking method; loading the cathode material adsorbed with the iodine substance on a conductive substrate, and coating the outer layer with the polysaccharide gel to obtain a polysaccharide gel protective film modified cathode; and assembling the zinc anode, the polysaccharide gel protective film modified cathode and the electrolyte into the zinc-iodine battery without multi-iodide shuttling. According to the invention, the gel is prepared from a polysaccharide substance and is coated on the surface of the cathode of the zinc-iodine battery, and through chemical and physical adsorption of the polysaccharide gel on the polyiodide, the purpose of inhibiting shuttling of the polyiodide can be achieved.

The present application relates to a zinc-iodine battery positive electrode binder, a zinc-iodine battery positive electrode sheet based on the binder, and a preparation method and application thereof, and belongs to the technical field of battery binder materials. The present application aims to solve the technical problem of serious poly-iodide shuttling in existing aqueous zinc-iodine batteries. The binder-based zinc-iodine battery positive electrode sheet preparation method of the present application comprises the following steps: dissolving the active material, the conductive agent and the binder in water according to a certain proportion, mixing them evenly to obtain a black paste slurry; applying the black paste slurry evenly on the current collector, and drying it naturally in the air to obtain the battery positive electrode sheet. The present application utilizes sodium lignin sulfonate as a positive electrode binder for aqueous zinc-iodine batteries to reduce the corrosion of poly-iodides on the zinc negative electrode, extend the life of the battery, and improve the initial capacity and cycle stability of the battery.

The invention discloses a carboxyl polymer-iodine electrode and a multi-electron zinc-iodine battery, and relates to the field of zinc-iodine batteries, and the carboxyl polymer-iodine electrode is prepared from the following components by weight: 10-20 parts of a carboxyl polymer, 70-80 parts of an iodine-loaded composite material, and 9-11 parts of a conductive agent. The carboxyl polymer is added and can form stable chemical bonds with iodine species (such as I2, I3-and I +) by utilizing the strong nucleophilicity and electronegativity of the carboxyl polymer, shuttling of polyiodide and dissolution of active iodine are effectively inhibited, meanwhile, high-valence iodine (I +) is stabilized through the strong coordination capacity of the carboxyl polymer, efficient proceeding of a four-electron reaction in the zinc-iodine battery is promoted, and the zinc-iodine battery has the advantages of high stability and high efficiency. The carboxyl polymer-iodine electrode is used as a positive electrode, so that the multi-electron zinc-iodine battery capable of realizing four-electron transfer is successfully obtained, and the energy density and the specific capacity of the zinc-iodine battery are improved.

The invention provides application of a superfine copper nanoparticle anchored 3DCNT-rGO composite material rapidly prepared through laser induction in preparation of a zinc-iodine battery, and belongs to the technical field of energy storage materials. The prepared composite material is composed of one-dimensional carbon nanotubes, reduced graphene oxide two-dimensional nanosheets and superfine copper nanoparticles, and the superfine copper nanoparticles are evenly distributed on a CNT-rGO three-dimensional conductive network. The 3D Cu-coated CNT-rGO material prepared by the method can provide rich adsorption sites for iodine species, so that the synergistic effect of physical constraint and chemical adsorption of the iodine species in a three-dimensional skeleton structure is realized. Moreover, the super-system nanoparticles provide abundant catalytic sites for the 3D Cu-coated CNT-rGO composite material, the redox kinetics in the iodine / polyiodide conversion process is accelerated, and the electrochemical performance of the micro zinc-iodine battery is remarkably improved. The research provides a new method for synthesizing the three-dimensional carbon material loaded with the superfine metal material, and meanwhile, an innovative way is provided for customizing an electrocatalyst for a high-performance micro zinc-iodine battery.