23results about How to "Lower nucleation overpotential" patented technology

The invention discloses a modified zinc electrode material as well as a preparation method and application thereof, 3, 4-ethylenedioxythiophene, lauryl sodium sulfate and potassium perchlorate are taken as electrolyte, and the surface of a zinc electrode is coated with an organic polymer coating in an electrochemical polymerization manner, so that the problems of dendritic crystal growth, side reaction, corrosion and the like of the zinc electrode are solved; the cycling stability and reversibility of the zinc electrode are improved; meanwhile, the coating has hydrophilicity and better electrolyte wetting capacity, zinc ions are helped to be rapidly diffused on an electrode, and the polarization influence caused by concentration difference in the cycle process of the battery is relieved. Besides, by controlling the electrochemical polymerization time, the thickness of the coating is controlled, and the method has the advantages of simplicity, rapidness and the like and is suitable for large-scale popularization and application.

The invention belongs to the technical field of negative-electrode-free sodium metal batteries, and particularly discloses a negative-electrode-free sodium battery modified current collector and a preparation method and application thereof.The preparation method includes the steps that on the basis of polypyrrole preparation, transition metal salt is added, and the nitrogen doping type in polypyrrole-derived nitrogen-doped nano carbon particles is regulated and controlled. The negative-electrode-free sodium battery modified current collector prepared by the preparation method disclosed by the invention is high in relative content of N-6 and N-5 type doped nitrogen, so that the sodium affinity of a nitrogen-doped coating is improved, the nucleation over-point location of sodium metal is reduced, the reversibility of a sodium deposition / stripping reaction is improved, and the electrochemical performance of a negative-electrode-free sodium battery is further improved.

The present invention belongs to the field of batteries, and specifically relates to a modified current collector for a negative electrode-free sodium metal battery, comprising a planar current collector and a single-layer modified layer composited on its surface; and the modified layer is composed of a binder, a conductive agent and a modified material in a weight ratio of 20-80:10-60:10-20; the modified material includes at least one of Y2O3, Gd2O3, yttrium carbonate, lead carbonate, tungsten carbonate, iridium carbonate, hafnium carbonate, molybdenum carbonate, gadolinium carbonate, yttrium titanate, iridium titanate, hafnium titanate, molybdenum titanate and gadolinium titanate. The thickness of the modified layer is 20-100 μm. The present invention also includes the preparation of the modified current collector and the application in a negative electrode-free sodium battery. The innovative research of the present invention shows that the modified current collector containing the modified material can adapt to the application requirements of negative electrode-free sodium batteries, can induce the deposition of sodium metal, can inhibit sodium expansion, and not only that, can also effectively inhibit sodium dendrites. Applying it to negative electrode-free sodium batteries can significantly improve its electrochemical performance.

The invention provides a negative electrode material, a preparation method thereof and an all-solid-state battery comprising the negative electrode material. An oxygen-containing heterocyclic substance is taken as a monomer, metal salt is added, ring-opening polymerization of the oxygen-containing heterocyclic monomer is initiated on at least one surface of a negative pole piece under the action of an initiator, and a gel functional layer containing the metal salt is formed. On one hand, the gel functional layer can be used as a buffer layer, so that the problem of poor contact of a solid-solid interface is effectively relieved, gaps at the interface are reduced, current distribution is uniform, and deposition of lithium ions at the interface is reduced; and on the other hand, the metal salt can react with lithium deposited at the interface to form substances including lithium magnesium alloy, lithium fluoride and the like, so that the nucleation overpotential of lithium is further reduced, the high ionic conductivity of the battery is improved, lithium dendrites are prevented from being formed, the electrochemical performance of the battery is improved, and the service life of the battery is prolonged.

This invention discloses a zinc thiocate modified copper current collector for electrodeless lithium metal batteries and its preparation method. Thioctic acid and zinc acetate are dissolved in solvents, and a composite solution is prepared by the coordination interaction between zinc ions and the carboxyl groups of thiocate. This composite solution is then spin-coated onto the surface of the copper current collector to form an ordered protective coating. This invention synergistically regulates the interface through the dual functions of zinc ions: firstly, zinc ions act as divalent coordination centers, cross-linking with thiocate molecules to construct a stable and regularly arranged protective coating; secondly, zinc ions act as lithiophilic nucleation sites, reducing the lithium nucleation overpotential, inducing uniform lithium ion deposition, and significantly inhibiting lithium dendrite growth. The modified current collector of this invention achieves a synergistic improvement in interface stability and electrochemical activity, enabling the battery to possess excellent cycle life and high safety, providing a novel interface design strategy for high-performance electrodeless lithium metal batteries.

The application relates to the technical field of battery materials, and discloses a sodium-philic carbon-based material, a negative-electrode-free current collector, a preparation method of the sodium-philic carbon-based material and a sodium metal battery. The preparation method of the sodium-philic carbon-based material comprises the following steps: providing a mixed solution, wherein the mixed solution comprises carbon source powder, an iron source and a solvent; fully reacting the mixed solution in a protective atmosphere at 160-240 DEG C; obtaining a carbon-loaded sodium-philic material after solid-liquid separation; fully calcining the carbon-loaded sodium-philic material in an inert atmosphere at 700-900 DEG C to obtain a porous sodium-philic precursor; and treating the porous sodium-philic precursor in a reaction gas atmosphere at 400-700 DEG C for 1-3 hours to obtain the sodium-philic carbon-based material. The reaction gas atmosphere is an ammonia gas and inert gas mixed atmosphere or an ammonia gas atmosphere. The material is coated on the surface of the negative-electrode-free sodium metal battery current collector, and can enhance the electrochemical performance of the battery.

The application relates to a preparation method and application of a porous material of porous lithium and its alloy. A foaming agent is fully mixed with metal lithium or a lithium alloy, the mixed lithium metal or lithium alloy is heated to a melt state through orderly temperature rising, a three-dimensional porous structure is generated in the melt through thermal decomposition and gas release of the foaming agent, and the porous material is obtained after the melt is cooled and solidified. The application can significantly inhibit the volume expansion of the negative electrode in the cycle process, reduce the nucleation overpotential of the metal lithium, and induce the uniform deposition of the metal lithium. Meanwhile, the substances generated in the decomposition process of the foaming agent can react with the metal lithium to form a protective layer around the pore wall, greatly inhibit the side reaction between the electrode and the electrolyte, accelerate the transmission of lithium ions, and realize the uniform and dense deposition of the metal lithium through the self-supporting structure, avoid the loss of the energy density of the electrode, reduce the manufacturing cost, inhibit the volume expansion of the lithium negative electrode, inhibit the dendrite growth, and improve the electrochemical performance of the lithium metal battery.

The invention belongs to the field of batteries, and particularly relates to a polymer coating, a preparation method thereof, a negative electrode current collector and a negative-electrode-free sodium ion battery. The polymer coating provided by the invention is prepared from a coating containing a polymer precursor, a photocuring initiator, an electronic conductor, an ionic conductor and a binder, wherein the chemical structure of the polymer precursor is shown as a formula A; in the formula A, X is Br, and R is one or more of a propenyl group, a butenyl group, a propynyl group, a methyl vinyl ketone group, a 3-hepten-2-ketone group, a 5-methyl-3-hexene-2-ketone group and a 5, 5-difluoro-1-hexenyl group. The polymer coating provided by the invention is introduced into the negative-electrode-free sodium ion battery as a negative electrode current collector surface coating, and is matched with reasonable electron and ion conductors, so that the electron and ion transmission capability at a negative electrode interface can be obviously improved, the growth of sodium dendrites during a circulation period is obviously inhibited, and the electrochemical performance of the battery is obviously improved. # imgabs0 #

The invention provides a lithiation diaphragm as well as a preparation method and application thereof, and belongs to the field of lithium metal batteries. The lithiation separator comprises: a base film; the coating is attached to at least part of the area of the diaphragm, and the coating contains an inorganic substance embedded with Li < + >. The base membrane of the lithiation diaphragm is used as a support body, so that the mechanical strength and stability of the diaphragm are ensured. And the coating is attached to at least partial region of the base film and contains Li < + >-embedded inorganic matters. The coating structure has a highly uniform ion channel on the nanoscale, and uniform transmission of Li < + > is facilitated. Meanwhile, due to the embedding of a large amount of Li < + >, a large amount of oxygen vacancies are generated, and the reducibility is enhanced, so that a natural passivation layer on the lithium metal can react preferentially, and the nucleation overpotential is reduced. The diaphragm with multiple oxygen vacancy sites is constructed, dissociation of lithium salt is facilitated, the transference number of lithium ions is increased, and uniform distribution of the lithium ions is promoted. Therefore, the coulombic efficiency and the safety of the lithium metal battery are improved at the same time.

The invention belongs to the field of energy materials, and discloses a preparation method of a lithium metal negative electrode of a lithium metal battery and a product and application of the lithium metal negative electrode of the lithium metal battery, and the preparation method comprises the following steps: using a conductive substrate as a working electrode, using an electrode composed of a lithium-containing substance as a counter electrode, and performing electro-deposition on the working electrode in a pure solvent or a low-salt solution to obtain the lithium metal negative electrode of the lithium metal battery. The correspondingly obtained working electrode is the lithium metal negative electrode. By using a pure solvent or a low-salt solution, high-efficiency electrochemical deposition of lithium can be carried out without participation of a traditional electrolyte of high-content lithium salt, correspondingly, the metallic lithium elementary substance (or lithium alloy) deposited on the working electrode is high in density, and the performance of the lithium ion battery is improved. The obtained electrode deposited with the lithium metal can be particularly used as a negative electrode to be applied to a lithium ion battery, and has the advantages of being simple in method, low in cost, controllable, expandable, high in industrial adaptability and convenient for large-scale operation.

The invention relates to the technical field of metal lithium batteries, and discloses a metal lithium negative electrode active material and a preparation method thereof, a metal lithium negative electrode and a metal lithium battery, the negative electrode active material comprises metal lithium and a Fe2O3-carbon composite material; wherein the Fe2O3-carbon composite material comprises a nitrogen and oxygen co-doped carbon nano cage and Fe2O3 nano particles, and the nitrogen and oxygen co-doped carbon nano cage is filled with the Fe2O3 nano particles; wherein in the Fe2O3-carbon composite material measured by X-ray photoelectron spectroscopy, the molar content of a carbon element is 75-98%, the molar content of an oxygen element is 1-10%, the molar content of nitrogen is 0.5-5%, and the molar content of iron is 0.5-10%. The metal lithium negative electrode active material is applied to a metal lithium battery, and has relatively high specific capacity, good cycling stability and high coulombic efficiency.

The application discloses a carbon-based lithium metal composite electrode co-modified by ferroelectric materials and single metal atoms and a preparation method and application thereof. The ferroelectric material is added into a spinning solution to be electrostatically spun into a film, metal ions are adsorbed through ion exchange after activation, and then the carbon-based lithium metal composite electrode is obtained through calcination reduction and finally electrochemical deposition of lithium. The ferroelectric material has a high dielectric constant, can reduce the generation of dendrites by adjusting the lithium ion flux, can promote the uniform distribution of metal atoms on the electrode material to compensate for the poor lithium affinity of the carbon skeleton itself, and can adsorb metal atoms on the surface of the carbon fiber instead of the inside by combining electrostatic spinning and ion exchange method, thereby significantly shortening the diffusion distance of lithium ions, reducing the nucleation overpotential, making the lithium ion diffusion and deposition uniform, effectively improving the lithium deposition uniformity of the carbon-based substrate as the negative electrode of the lithium metal battery, and improving the performance of the electrode.

The present invention provides a nitrogen-doped carbon nanotube encapsulated nickel nanoparticle skeleton and its preparation and application, thereby inhibiting the growth of sodium dendrites, improving the reversibility of sodium metal negative electrode electrodeposition and stripping, and achieving high coulombic efficiency and stable cycle of metallic sodium in half-cell and symmetric cell tests. The deposited skeleton of the present invention has a large specific surface area, can effectively reduce the local current density, inhibit the growth of sodium dendrites, and alleviate volume expansion; nitrogen doping increases the sodium affinity of the deposited skeleton, can reduce the nucleation overpotential, and has a strong local electron density, which can induce uniform deposition of sodium; in addition, free electrons can be transferred from nickel nanoparticles to the carbon layer, so that the carbon surface is enriched with electrons, and promotes the uniform deposition of sodium on the skeleton surface. The deposited skeleton of the present invention can improve the cycle performance of the battery and will provide a new idea for the development of a stable sodium metal negative electrode.

The invention provides a negative pole piece, a preparation method thereof and a secondary battery. The negative pole piece comprises a current collector layer, and a modified layer and a negative active material layer which are sequentially stacked on at least one side of the current collector layer; and the material of the modified layer comprises a polymer of benzodifuran and derivatives thereof. The negative pole piece provided by the invention not only can effectively reduce the nucleation overpotential of lithium ion deposition, but also can inhibit the growth of lithium dendrites, so that the electrochemical performance of the lithium metal secondary battery is improved.

The present invention provides a method for preparing a self-supporting porous nitrogen-doped graphene network lithium metal main material, comprising the following steps: step 1: dispersing graphene oxide in deionized water, ultrasonically dispersing to form a suspension, and obtaining a graphene oxide suspension; step 2: adding reduced red F3B dye to the suspension obtained in step 1, ultrasonically and uniformly stirring to obtain a mixed solution; step 3: pouring the mixed solution of step 2 into a template, putting it into an oven to self-assemble into a film through a liquid-gas interface, and obtaining a self-supporting composite film; step 4: heat-treating the composite film of step 3 under a protective atmosphere to obtain a self-supporting porous nitrogen-doped graphene network lithium metal main material. The present invention realizes the high rate performance of lithium metal batteries, promotes the development of lithium metal batteries, and provides a new self-supporting lithium metal main material for rapid charging and discharging, which is simple to operate and can be prepared on a large scale.

The invention belongs to the technical field of lithium metal batteries, and particularly discloses a composite lithium metal negative electrode and a preparation method and application thereof. The composite lithium metal negative electrode comprises a copper foil, a high-entropy alloy coating compounded on the surface of the copper foil and lithium metal loaded in the high-entropy alloy coating, wherein the high-entropy alloy coating consists of high-entropy alloy particles, a carbon material and an adhesive. The preparation method comprises the following steps: mixing high-entropy alloy particles, a carbon material and an adhesive to prepare slurry, and coating the surface of a copper foil with the slurry to form the high-entropy alloy coating; and depositing lithium metal in an electrolyte by taking the lithium metal as a working electrode to obtain the composite lithium metal negative electrode. The high-entropy alloy particles have good lithium wettability, the nucleation overpotential of lithium metal can be reduced, the volume effect and dendritic crystal growth are effectively avoided, and the long cycle life is achieved.

The invention provides a current collector with a three-dimensional porous structure on the surface, a preparation method and a battery. The preparation method comprises the following steps: firstly, obtaining a tin / copper foil with a three-dimensional structure on the surface through constant-current electrodeposition tin; then coating an indium tin seed layer on the tin surface of the three-dimensional structure through co-electrodeposition of indium tin, and on the basis, continuously performing constant-current electrodeposition of indium to obtain indium / indium tin / tin / copper foil with a three-dimensional porous structure on the surface; and finally, enabling the indium / indium tin / tin / copper foil to form an alloy by adopting a heat treatment technology so as to obtain the current collector with a walnut-shaped three-dimensional porous structure on the surface. Therefore, the lithium nucleation overpotential can be reduced, and the uniform deposition of lithium is guided, so that the growth of lithium dendrites and the volume expansion of lithium metal are effectively inhibited.

A nitrogen-sulfur dual-doped and zinc-loaded ultra-thin carbon-walled carbon sphere and its preparation method and application, using zinc acetate dihydrate, thiourea, ethylenediamine, deionized water, and dimethylimidazole as raw materials, through the steps of hydrothermal synthesis of wurtzite zinc sulfide nanosphere precursor, carbonization and etching, to obtain radial carbon spheres stacked by fully closed mesopores. The internal mesopores of the carbon sphere are dense and connected, and the carbon wall is ultra-thin, only at the atomic level. The method provided by the present invention has a reference value for the regulation of zinc sulfide nanostructures, and when the ultra-thin carbon-walled carbon spheres synthesized based on this are used as negative electrode materials for sodium metal batteries, the ultra-thin carbon wall is conducive to the rapid penetration and transmission of sodium, and can achieve nano-encapsulation of sodium metal, thereby effectively limiting the deposition of sodium metal and inhibiting the generation of sodium dendrites, so that the metal battery has good electrochemical cycle performance.

The invention belongs to the field of new-generation high-performance green energy storage, and particularly relates to a stripped two-dimensional molybdenum disulfide nanosheet modified lithium negative electrode and a preparation method and application thereof.The preparation method comprises the following steps that 1, molybdenum disulfide powder is added into an n-butyllithium solution, after stirring, filtering is conducted, supernate is reserved, a polar solvent is added into the supernate, stirring is conducted, and the molybdenum disulfide nanosheet modified lithium negative electrode is obtained; colloid molybdenum disulfide is formed; (2) adding colloidal molybdenum disulfide into water, carrying out ultrasonic treatment to obtain an EMoS2 dispersion liquid, diluting the dispersion liquid with ethanol or a deionized water solution, and carrying out suction filtration on a polypropylene diaphragm to form EMoS2 (at) PP; and (3) after the composite film obtained in the step (2) is dried, one surface containing the stripped molybdenum disulfide is attached to metal lithium, the stripped molybdenum disulfide is transferred to the surface of the metal lithium by utilizing a rolling technology, and then polypropylene is removed, so that EMoS2 (at) Li is obtained, the EMoS2 (at) Li can be used as a negative electrode of a lithium-sulfur battery, deposition of lithium ions on the negative electrode side can be effectively regulated and controlled, and the service life of the lithium-sulfur battery is prolonged. And the expansion of lithium dendrites to the positive electrode is limited.

The invention relates to the technical field of air-composite copper current collectors, and discloses an air-composite copper current collector and a preparation method thereof. The component structure is a polymer film, a bonding transition layer, a metal copper layer and an anti-oxidation layer from the inside to the outside. The polymer film is located in the middle of the composite copper current collector, the bonding transition layer is formed on both sides of the polymer film, the metal copper layer is formed on both sides of the bonding transition layer, and the anti-oxidation layer is formed on both sides of the metal copper layer. The preparation steps include: magnetically controlling a layer of metal material on the upper and lower sides of the polymer film to obtain the bonding transition layer; simultaneously vapor-depositing metal aluminum and metal copper on the surfaces of the upper and lower bonding transition layers, immersing in a 10wt% sodium hydroxide solution after the vapor-depositing, dissolving the metal aluminum, and obtaining the metal copper layer; performing anti-oxidation treatment on the surfaces of the upper and lower metal copper layers to obtain the air-composite copper current collector.

This application provides a negative electrode current collector, comprising a substrate and a lithium alloy, wherein the lithium alloy is disposed on the surface of the substrate, the lithium alloy comprising lithium and a matrix material, wherein the atomic ratio of lithium in the lithium alloy is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m. 2 This application also provides a method for preparing the above-mentioned negative electrode current collector, a positive electrode sheet, a secondary battery, and an electrical device. The negative electrode current collector provided in this application is prepared by depositing the lithium alloy on the surface of the negative electrode current collector. In the lithium alloy, the atomic ratio of lithium is 30%-50%, and the plating weight of the lithium alloy is 2-3 g / m². 2 During the charging process of a secondary battery, lithium atoms can be oxidized into lithium ions and enter the electrolyte to replenish the lithium consumed by the formation of the solid electrolyte interphase (SEI) at the negative electrode of the lithium-ion battery. This helps to improve the quality of the SEI and thus improves the initial coulombic efficiency of the secondary battery.

This invention belongs to the field of new energy storage materials technology, specifically relating to a method for preparing and applying an ultrathin copper current collector modified with a carbon nanotube composite coating. Addressing the problems of strong lithium repellency, uneven metal deposition, and short cycle life of copper current collectors in electrodeless lithium-ion batteries, this invention constructs a composite functional layer on an ultrathin copper foil, composed of zinc-based oxide rich in oxygen vacancies and carbon nanotubes. In this coating, the zinc-based oxide acts as a highly lithium-affinity site, effectively reducing the metal nucleation overpotential; the carbon nanotube network provides a rapid electron conduction path and alleviates deposition stress. The preparation process is environmentally friendly, employing an aqueous slurry system and a simple heat treatment process. This modified current collector, used in electrodeless lithium-ion batteries, can guide uniform and dense metal deposition, significantly improving the battery's coulombic efficiency and cycle stability.

This invention discloses a functionalized negative electrode-free sodium-ion battery current collector and its preparation method, relating to the field of sodium-ion battery technology. The invention provides a functionalized negative electrode-free sodium-ion battery current collector, comprising the following structure: a substrate, a transition layer, and a modification layer; the transition layer is disposed between the substrate and the modification layer; the invention alleviates the volume expansion of the substrate and modification layer by depositing sodium-affinity antimony metal on the substrate surface to form the transition layer; by constructing the modification layer, sodium-affinity sites are enriched, reducing the sodium nucleation overpotential and improving the uniformity of sodium deposition; sodium-affinity porous carbon fibers are introduced to provide more nucleation sites and capacity space for sodium deposition, alleviating volume expansion stress; by introducing sodium-affinity bismuth metal, the energy barrier required for sodium nucleation is lowered, thereby guiding sodium metal to deposit more uniformly and densely on the current collector surface, effectively suppressing the disorderly growth of sodium dendrites, and synergistically improving the rate performance and cycle stability of the sodium-ion battery.