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

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 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 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.