31results about How to "Lower nucleation overpotential" patented technology

The invention discloses an aqueous zinc ion battery negative electrode, a preparation method and a battery. The method comprises the steps of (1) dropwise adding a silver nanowire suspension onto a battery negative electrode substrate, wherein the substrate is a zinc sheet; and (2) drying the substrate dropwise added with the silver nanowire suspension to obtain the aqueous zinc ion battery negative electrode, wherein the silver nanowires on the battery negative electrode and the zinc sheet substrate are subjected to alloying reaction in an electrochemical cycle process to form an AgZn3 alloy layer taking the silver nanowires as a three-dimensional substrate. According to the invention, the nucleation overpotential of zinc in the battery cycle process is successfully reduced, the corrosion resistance of the negative electrode is improved by utilizing the stability of the silver-zinc alloy layer to zinc and the isolation effect of the silver-zinc alloy layer to electrolyte, and meanwhile, the impedance and polarization of the battery can be greatly reduced due to the good conductivity of silver, so that the problems of dendritic crystal growth and corrosion in the zinc negative electrode are solved, and the electrochemical performance of the battery is improved.

The invention relates to a carbon nanosphere containing single atom Fe and a preparation method thereof and application. The method comprises the following steps: (a) pyrrole is added to water, polymerization is conducted under effects of an iron-containing catalyst and an oxidizing agent, and a polypyrrole spherical dispersion is obtained; (b) the polypyrrole spherical dispersion is dried to obtain a Fe-containing nanosphere precursor; and (c) the Fe-containing nanosphere precursor is placed in an inert atmosphere for calcination and carbonization. A simple and template-free method is used to synthesize a single atom Fe-containing nitrogen-doped carbon nanosphere material, the nucleation overpotential of lithium dendrites can be reduced due to the existence of the single atom Fe, the lithium dendrites are made for uniform nucleation on the surface of a negative electrode, and growth of the lithium dendrites is suppressed; and on the other hand, with the carbon nanosphere structure, the mechanical tension generated by volume expansion can be well blended, and the electrochemical integrity of the structure is kept.

The invention discloses a preparation method of a lithium battery with a Pd-Cu net / lithium metal composite material electrode. A composite material prepared from palladium and a copper net is used asa three-dimensional current collector, so that growth of lithium dendrites can be inhibited, and manufacturing of the lithium battery with long service life is realized. A composite material preparedfrom Pd and a copper net on the negative electrode of a lithium metal-based battery is used as a three-dimensional current collector, so that the growth of negative electrode lithium dendrites can beeffectively inhibited, and the cycle life of the battery is prolonged. Metal lithium serves as the negative electrode of the lithium battery and has ultrahigh theoretical specific capacity and lowestreduction potential, but growth of uncontrollable lithium dendrites can cause internal short circuit of the battery, so that the battery fails and potential safety hazards are caused. Through electroplating replacement reaction, Pd nanoparticles can be simply and quickly modified on the surface of the copper net, and the prepared Pd-copper mesh has a quite large surface area; Pd atoms in the Pd-copper net can be combined with Li and have very high affinity with Li, so that the growth of lithium dendrites can be effectively inhibited.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium metal negative electrode deposition substrate and a preparation method and application thereof. The preparation method of the sodium metal negative electrode deposition substrate comprises the following steps: preparing porous graphene, and then preparing a sodium metal deposition matrix by a blade coating method or a rolling method. The sodium metal negative electrode deposition substrate provided by the invention is a deposition substrate based on porous graphene, has a large specific surface area, can effectively reduce local current density and homogenize sodium ion flow, has rich oxygen-containing functional groups, and can increase surface's sodium affinity, so that uniform nucleation anddeposition of sodium are guided. The formation of sodium dendrites is effectively inhibited, and excellent performance is shown in tests of half cells and symmetrical cells.

In order to overcome the problem of low lithium affinity of an existing porous skeleton, the invention provides a porous current collector. The current collector comprises a conductive porous skeleton, a plurality of micropores are formed in the conductive porous skeleton, and copper oxide layers are formed on the surface of the conductive porous skeleton and the inner walls of the micropores. Meanwhile, the invention also discloses a preparation method of the porous current collector, a lithium negative electrode and a lithium ion battery. According to the porous current collector provided bythe invention, the specific surface area of the conductive porous skeleton is increased, and meanwhile, the nucleation overpotential of lithium deposition is effectively reduced, so that lithium is uniformly deposited on the surfaces of micropores of the conductive porous skeleton in the embedding process, and the generation probability of lithium dendrites is reduced.

The invention belongs to the field of secondary lithium metal batteries, and more specifically relates to a composite lithium metal negative electrode and a preparation method thereof. The preparation method of the present invention comprises the following steps: (1) preparing conductive metal nanowire ink, immersing a metal mesh in the metal nanowire ink, taking out the metal mesh and drying to obtain a metal mesh loaded with conductive metal nanowire; 2) placing the metal mesh loaded with the conductive metal nanowires flat on the metal lithium foil, rolling by a roller press, and removing the metal mesh to obtain a composite lithium metal negative electrode. In the present invention, the metal mesh is used to press the array channel pattern on the metal lithium foil. On the one hand, the mechanical strength of the metal mesh is greater than that of lithium, and it is easy to carry out effective rolling to construct the channel. Compared with the flat lithium foil, the obtained composite lithium metal negative electrode has extremely Low polarization voltage and excellent cycle stability have great application value in the field of lithium metal secondary batteries.

The invention discloses a lithium metal battery negative electrode and a preparation method thereof, belongs to the technical field of battery energy, and aims to construct a lithium-loving layer on the surface of a copper current collector, reduce the nucleation overpotential during lithium metal deposition, improve the polarization condition of an electrode, improve the reversibility of electrode reaction in the battery and prolong the service life of the lithium metal battery. The negative electrode of the lithium metal battery used in the invention is a composite current collector modified with a lithium-loving layer; the preparation method comprises the following steps: firstly, placing a cleaned copper foil in a muffle furnace by adopting an air oxidation method to oxidize, forming an oxide layer on the surface of a current collector, then modifying the oxidized copper current collector by utilizing a thermal diffusion method by virtue of the volatility of lithium oxide, finally obtaining the composite current collector, and assembling the battery to test the electrochemical performance of the battery. The result shows that lithium is stably and uniformly deposited on the surface of the electrode, and the cycle life and coulombic efficiency of the lithium metal battery are greatly improved.

The invention discloses a preparation method and application of less-fluorine porous titanium carbide meconene. The method is: Ti 3 AlC 2 Dissolve in concentrated hydrofluoric acid, wash and dry after magnetic stirring to obtain powder A; disperse powder A into sodium hydroxide solution, wash and dry after magnetic stirring to obtain powder B; disperse powder B in deionized water to obtain solution, transfer the solution to a high-pressure reactor and place it in a constant temperature drying box, wash and dry after constant temperature drying to obtain powder C; 4) disperse powder C in dilute hydrofluoric acid, wash and dry after magnetic stirring, A less fluorine porous titanium carbide meconene was obtained. The less-fluorine porous titanium carbide miconene provided by the present invention is applied to the working electrode material of lithium metal batteries, exhibits low nucleation overpotential and excellent cycle stability, and can effectively inhibit the growth of lithium dendrites. It has excellent application prospects in cheap and high-performance lithium metal batteries.

The invention discloses a method for preparing a nickel nitride-nickel foam composite lithium metal negative electrode current collector, which comprises the following steps: 1) preparing a foam nickel material of required specifications, cleaning and drying it for use; 2) making step 1) The cleaned and dried nickel foam is placed in a discharge plasma reaction furnace, and then the reaction furnace is evacuated and the reaction gas is continuously introduced; 3) the discharge generates plasma to bombard the foam nickel, and the reaction temperature and reaction time are controlled. Reaction generates nickel nitride layer, obtains described nickel nitride-nickel foam composite lithium metal negative electrode current collector. The invention utilizes the etching effect of plasma and the high chemical activity of nitrogen-containing particles to form a layer of lithium-friendly nickel nitride on the surface of nickel foam. During the charging and discharging process of the battery, the nickel nitride reacts with lithium to promote lithium The metal is uniformly deposited, and the preparation process is easy to control. The obtained negative electrode current collector has a three-dimensional structure, and the electrochemical performance is significantly improved.

The invention discloses a lithium metal battery cubic hole carbon coating separator and a preparation method thereof, belonging to the technical field of battery materials. The coating material of the lithium metal battery coating diaphragm provided by the present invention has a nano-sheet structure and has cubic holes, and the cubic holes are surrounded by carbon walls; the cubic holes are uniform in size, with a side length of 20-28nm, and are closely stacked arrangement. The coating material is obtained from carbon-containing organic matter through carbonization and then removing templates. The coating material of the invention has good electrolyte wettability, improves the utilization efficiency of the electrolyte, can reduce the interface impedance, and improves the rate capability of the lithium metal battery.

The invention belongs to the field of metal lithium battery negative electrode materials, and specifically discloses a lithium ion battery negative electrode and a preparation method thereof. The lithium ion battery negative electrode includes a base and a modified material, wherein the base is copper simple substance, and the modified The material is a chalcogen copper compound generated in situ on the surface of the copper element. The preparation method of the negative electrode of the lithium ion battery comprises the following steps: the copper element is placed in the reactor and heated, and then the chalcogenide powder is passed into the reactor through the purge gas, and the chalcogenide powder reacts with the copper element, The uniform chalcogen copper compound is generated in situ on the surface of the copper element, and the preparation of the negative electrode of the lithium ion battery is completed. The invention solves the problem of uneven deposition of lithium ions in the lithium ion battery, improves the cycle stability of the lithium ion battery, and can reduce the nucleation overpotential of lithium ions at the same time, which is beneficial to the nucleation of lithium ions.

The invention discloses a gas phase synthesis method of a lithium metal negative electrode porous Zn current collector with controllable thickness, and relates to a lithium metal battery. The distancebetween a target material and a substrate is increased before the target material is sputtered by adopting a plasma magnetic control sputtering method; the target material is installed, a radio frequency power supply is connected, the substrate is fixed to a vacuum chamber indoor substrate, and vacuumizing is carried out; a flow meter and a molecular pump are adjusted to enable gas Ar to enter achamber, the power supply is turned on to adjust the power, and pre-sputtering is started; the deposition rate of a porous thin film is measured through a scanning electron microscope, the porous thinfilm is directly deposited on a silicon wafer to test the sizes and shapes of nano particles, and the porous thin film is directly deposited on a copper sheet to serve as a lithium metal negative electrode current collector assembled semi-battery, and the coulombic efficiency of the lithium metal negative electrode current collector assembled semi-battery is tested; and a porous metal Zn thin film is used as a working electrode, lithium metal is used as a reference and counting electrode, and a polypropylene diaphragm is used as a diaphragm. A prepared porous lithium metal film has the advantages of being not restrained by the melting point and hardness of materials, simple in process, high in yield and the like, and is suitable for scientific research and large-scale production.

Cu 3 Pt copper mesh-lithium metal electrode and its preparation method and lithium battery preparation method, including that the electrode is a three-dimensional porous frame structure, and the electrode includes Cu 3 Pt copper mesh and lithium metal foil; the lithium metal foil is fully embedded in the Cu3Pt copper mesh; the Cu 3 The Pt copper mesh includes Cu-based current collectors and Cu 3 Pt coating, the outer surface of the Cu-based current collector is evenly coated with the Cu 3 Pt coating; Cu 3 Pt copper mesh with ultra-rough surface; synthesis of chloroplatinic acid mixed solution; synthesis of Cu 3 Pt copper mesh; electrode preparation; the present invention can quickly and simply wrap a layer of Cu on the outer wall of the copper mesh through electroplating displacement reaction 3 Pt alloy, thus making Cu 3 Pt copper mesh has an ultra-rough surface and thus a considerable surface area; Cu 3 Pt atoms in Pt can combine with Li (i.e. Cu 3 The Pt atom in Pt can be lithiated), which has a high affinity with Li. Therefore, Cu 3 The Pt‑Cu mesh reduces the nucleation overpotential of Li metal.

The invention discloses an application of a metal material and a zinc-based battery using the metal material as a negative electrode, the metal material is used as the negative electrode of the zinc-based battery, and the metal material is a metal capable of forming a solid solution with zinc. The metal material is an alloy composed of any one or more of silver, iron, nickel, titanium, copper, tinand aluminum. Preferably, the metal material is copper or tin. The metal material disclosed by the invention can form a solid solution with zinc, reduce the nucleation overpotential of zinc deposition and accelerate zinc nucleation, so that the nucleation rate is greater than the growth rate, thereby inhibiting dendritic crystal growth, obtaining a uniform and flat deposition layer, prolonging the service life of a battery and improving the coulombic efficiency of the battery.