4results about How to "Improve lyophilicity" patented technology

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

The invention discloses a high-wettability gradient aperture composite diaphragm and a preparation process thereof. The diaphragm comprises a polyolefin base membrane layer and a synthetic fiber web layer prepared by a spunlace process, the overall thickness of the diaphragm is 8-12 [mu] m, the aperture of one side facing the positive electrode is 30-50 nm, and the aperture of one side facing the negative electrode is 50-100 nm; and the synthetic fiber web layer contains a tannic acid modifier. The tannic acid modified synthetic fiber web layer in the composite diaphragm can provide better wettability for the composite diaphragm, and polar functional groups on the surface of the tannic acid modified synthetic fiber web layer can homogenize lithium ion flow, guide uniform deposition of lithium and inhibit generation of lithium dendrites. The polyolefin layer mainly provides mechanical strength, and forms a gradient aperture structure with the spunlace modified polyethylene layer, so that the uniformity of current density is improved, the uniform deposition of lithium is effectively induced, and the growth of lithium dendrites is reduced.

A method for preparing a molybdate conversion film self-supporting aluminum foil negative electrode. It relates to a method for preparing a lithium ion battery negative electrode material. The present invention solves the problems of low specific capacity of lithium ion battery negative electrode material, rapid capacity attenuation and the like. The method of the present invention is as follows: 1. Pretreatment of aluminum foil; 2. Preparation of molybdate conversion coating; 3. Pre-lithiation of molybdate conversion film self-supporting aluminum foil negative electrode; 4. Preparation of lithium ion battery positive electrode and battery assembly. The pre-lithiated aluminum foil negative electrode material prepared by the method of the present invention has smaller impedance, relatively lower polarization, higher charge / discharge specific capacity and more stable cycle compared with the battery assembled by the aluminum foil negative electrode material without pre-lithiation. By generating a molybdate conversion film on the surface of the aluminum foil in situ, the liquid affinity of the aluminum foil surface can be effectively improved, thereby improving the contact area of the electrode and the electrolyte. A new direction is provided for the preparation of lithium ion battery negative electrode material. The present invention is applied to the field of lithium-free anode full battery.

This invention provides an electrode structure comprising a current collector, an active material layer, and a flow channel. At least one through-flow channel is formed on either side of the electrode. The flow channel consists of a functional coating and a flow channel above the coating. The functional coating is selected from one or more of ceramic coatings, solid electrolyte coatings, and polymer coatings. This invention coats the flow channel with a functional coating. The functional coating has better hydrophilicity than the active material, resulting in better liquid absorption and retention capabilities, higher cell wetting efficiency, and better wetting effect. This alleviates the problem of electrolyte deficiency in the middle area of ​​the cell and helps extend the cell's cycle life.