10results about How to "Improve lyophilicity" patented technology

According to the preparation method, PET and graphene are compounded to form a high-strength layer by utilizing a high-speed mixing and hot-pressing technology, so that the mechanical property and the deformation resistance of the diaphragm are effectively enhanced, and the safety and stability of a battery structure are ensured; pI and a pore-foaming agent are combined to prepare a breathable layer with an optimized pore structure, so that the breathability and the structural strength are balanced, and the operation efficiency and the safety of the battery under high-rate charge and discharge conditions are improved; the breathable layer is coated with aluminum oxide through a chemical vapor deposition or sol-gel method to form a lyophilic layer, and the interlayer bonding force is enhanced by combining PU and a silane coupling agent, so that the lyophilic property and the interface strength are improved, the permeation efficiency of an electrolyte is optimized, and the internal resistance of the battery is reduced; the surface of the diaphragm is modified through plasma treatment, so that the overall performance is further improved; the defects of a traditional battery diaphragm in the aspects of mechanical support, air permeability, lyophilic property and the like are overcome, and the overall performance of the battery is remarkably improved.

The invention belongs to the technical field of diaphragm materials, and particularly relates to a superfine fiber composite battery diaphragm and a preparation method thereof. According to the prepared superfine fiber composite battery diaphragm, a PP melt-blown fiber material serves as a base material, the diaphragm is pretreated through a synchronous hot rolling-drafting technology to obtain a base membrane, then the base membrane is subjected to plasma treatment to improve the lyophilic performance of the base membrane, and finally cellulose acetate / beta-cyclodextrin / nano-hydroxyapatite serves as a finishing agent to prepare the superfine fiber composite battery diaphragm. And coating finishing is carried out on the fiber membrane to improve the pore diameter structure of the diaphragm, so that the affinity performance of the diaphragm to electrolyte is further improved.

Provided in the present application are a method for treating a semiconductor substrate layer and a method for preparing a solar cell. The method for treating a semiconductor substrate layer comprises a step of providing a monocrystalline silicon wafer, a step of spraying a diffusion liquid onto a surface of the monocrystalline silicon wafer, and a step of annealing the monocrystalline silicon wafer, and further comprises subjecting the monocrystalline silicon wafer to a surface oxidation treatment before spraying the diffusion liquid onto the surface of the monocrystalline silicon wafer, wherein the surface oxidation treatment is used for improving the lyophilicity of the surface of the monocrystalline silicon wafer to the diffusion liquid, so as to improve the uniformity of the annealing treatment of the monocrystalline silicon wafer. The method for treating a semiconductor substrate layer provided in the present application can solve the problem of non-uniform spreading of a diffusion liquid, thereby greatly improving the performance of the semiconductor substrate layer.

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 application discloses a kind of battery separators of chitosan aerogel microspheres and CNF composite and preparation method thereof, belong to lithium ion battery technical field.The battery separator includes polyolefin porous base film and the coating layer of at least one side surface of the base film;The coating layer is formed by coating and drying by coating slurry including chitosan aerogel microspheres and CNF;The chitosan aerogel microspheres are porous particles formed after chitosan is crosslinked, freeze-dried and crushed.The application constructs light, multistage pore structure coating layer by chitosan aerogel microspheres and CNF composite, significantly improves the wettability of electrolyte, liquid absorption rate and liquid retention rate of separator under the premise of extremely low weight gain, and has good thermal stability, effectively solves the contradiction that traditional ceramic coating weight and wettability cannot be compatible.

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.

The present invention discloses a battery separator capable of in-situ regulating polarization strength, and a preparation method and application thereof, wherein a solution containing polyvinylidene fluoride-based copolymer powder is coated on the surface of a base film to obtain a separator having a polymer coating on the surface; a volatile polar solvent is then sprayed on the surface of the polymer coating, and the polar solvent is evaporated to obtain the separator. The battery separator comprises a base film and a PVDF-based ferroelectric polymer coating, wherein the proportion of the β phase in the entire PVDF crystalline phase reaches more than 80%, and the PVDF is a hollow network structure, the coating has a porosity of 20% to 80%, and a thickness of 1 to 10 μm. It has excellent ferroelectric and piezoelectric properties, and when used as a lithium battery separator, it can significantly improve the overall rate capacity and cycle stability of the battery. The preparation method is simple, low-cost, energy-saving and environmentally friendly, and suitable for industrial production.

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.

A film and a preparation method thereof and a battery, wherein the film contains the following components: a thermoplastic resin and a lyophilic modifier. The lyophilic modifier is added to modify the thermoplastic resin, thereby significantly improving the lyophilicity of the film and reducing the crystallinity. The modified film has excellent lyophilic and liquid-retaining properties, which is beneficial to improving the battery performance.