6results about How to "Reduced Polarization Voltage" patented technology

The application belongs to the technical field of all-solid-state lithium-sulfur battery materials, and relates to a lithium sulfide nano composite positive electrode material with high reaction kinetics and a preparation method and application thereof. The application aims to solve the deficiencies of the lithium sulfide positive electrode material in ion and electron conductivity, reduce the activation barrier of the lithium sulfide positive electrode material, improve the battery redox kinetics, and further improve the rate performance and cycle capacity of the battery. The lithium sulfide nano composite positive electrode material is prepared by using an in-situ synthesis method, the obtained composite material has rich metal atom crystals embedded in the lithium sulfide matrix, and a layer of amorphous carbon is uniformly coated on the surface. The finally obtained lithium sulfide nano composite positive electrode material exhibits high reversible capacity and excellent rate performance. The application has the characteristics of uniform coating and simple process, is suitable for large-scale production, and has a wide application prospect in the field of all-solid-state lithium-sulfur batteries.

The application provides a pore-forming agent for lithium ion batteries and a preparation method thereof, which comprises a wall material preparation step, a core material preparation step, a W / O type initial milk preparation step and a pore-forming agent for lithium ion batteries preparation step. The pore-forming agent preparation method is a new pore-forming agent synthesis route, which has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and environmental protection. The technology can accurately construct a uniform multi-level pore network by introducing the pore-forming agent into the electrode, significantly reduces the charge transmission impedance, effectively improves the fast charging capacity and high-rate discharge performance of the battery, greatly improves the electrode-electrolyte interface contact, and ensures the full use of the active material. The application also provides an application of the pore-forming agent for lithium ion batteries to lithium ion batteries. The application of the pore-forming agent for lithium ion batteries to the lithium ion batteries can improve ion conduction and improve the rate performance.

This invention discloses a lithium metal anode based on a gradient solid-state electrolyte, its preparation method, and its application. The lithium metal anode sequentially comprises: a current collector, a porous lithium-zinc alloy interface layer, a lithium metal layer, and a gradient solid-state electrolyte layer. The gradient solid-state electrolyte layer includes a polymer matrix and a high-dielectric filler layer distributed in a gradient within the polymer matrix. In this invention, the porous lithium-zinc alloy interface layer and the gradient high-dielectric filler polymer layer work synergistically to effectively guide uniform lithium-ion deposition, suppress dendrite growth, and reduce tip effects, thereby improving cycle life, reducing interface impedance and polarization voltage, and minimizing volume expansion.

The invention relates to a gel electrolyte material based on a zwitter-ion covalent organic framework and a preparation method of the gel electrolyte material. The invention discloses a preparation method of a gel electrolyte material based on a zwitter-ion covalent organic framework. The preparation method comprises the following steps: (1) preparing a nanoscale film substrate from a chain alkane polymer by adopting electrostatic spinning; (2) immersing the nanoscale film substrate into a reaction solution containing a COF precursor, and carrying out an in-situ polymerization reaction to obtain a composite film material; (3) dispersing the composite film material in acetonitrile, adding sultone monomers in the presence of argon at room temperature, and carrying out nucleophilic ring-opening reaction to obtain a functional film material; and (4) placing the functionalized film material in an organic electrolyte solution containing lithium salt, and obtaining the gel electrolyte material through physical swelling action. According to the zwitter-ion covalent organic framework-based gel electrolyte material and the preparation method thereof disclosed by the invention, the problems of low ion conduction efficiency, poor interface stability and the like of the existing electrolyte are solved.

This application discloses a battery activation method, belonging to the field of battery technology. The battery activation method includes: after initially obtaining a battery in a first state, performing multiple charge-discharge processes on the battery in the first state. Each charge-discharge process includes: first discharging the battery in the first state at a constant current of a first current to a second voltage, then discharging at a constant voltage of the second voltage to a second current, so that the battery is in the second state; then charging the battery in the second state at a constant current of a third current to the first voltage, so that the battery is in the first state. After the battery has undergone this activation method, both the lithium ions at the positive electrode and the lithium ions at the negative electrode are activated, thereby activating the battery. In subsequent battery processes, the lithium ions at both the positive and negative electrodes react more readily, resulting in higher chemical reaction rates at both electrodes, thereby reducing the battery's polarization voltage and improving its high-power charge-discharge performance.

The application discloses a kind of zinc negative electrode PVA / porous carbon array protective layer femtosecond laser preparation method, zinc negative electrode material and its application, to solve zinc negative electrode dendrite growth, corrosion passivation, hydrogen evolution side reaction highlights and the problems such as existing protective layer preparation process is complex, structure regulation precision is low.The preparation method includes three steps: S1 PVA is mixed with deionized water, heated and stirred to form a semi-thick solution;S2 the solution is uniformly coated on the surface of zinc foil, and a PVA protective layer is formed after drying;S3 PVA protective layer is decomposed by femtosecond laser, and a porous PVA / porous carbon array composite protective layer is prepared.The composite protective layer enhances the interface stability through PVA, and the synergistic effect of porous carbon guiding zinc ion uniform deposition effectively inhibits dendrite growth and corrosion reaction.The application process is simple, raw materials are environmentally friendly and cost is relatively low, suitable for mass production, and provides key technical support for commercialization of aqueous zinc ion battery.