48results about How to "Inhibition of lithium dendrites" patented technology

The invention discloses a method for preparing a ceramic-based composite solid electrolyte, which is characterized in that: the specific preparation method is as follows: including the preparation of a gel electrolyte, the preparation of a ceramic-based electrolyte and the preparation of a ceramic-based composite electrolyte, wherein the gel electrolyte Preparation, mix acrylate material, cross-linking agent and electrolyte together, stir evenly; add initiator to the above mixed solution, stir evenly after adding; step 2: preparation of ceramic base electrolyte The base pyrrolidone solvent is made into a solution according to the ratio of mass ratio 1:10-20; the fast ion conductor and the lithium salt are added to the above solution according to the metering ratio, and a uniformly dispersed slurry is obtained through stirring, ultrasonication, etc.; the above slurry Evenly coated on a glass plate, dried at 30-60°C for 24 hours, and then vacuum-dried at 50-60°C for 24 hours to obtain an electrolyte membrane with a thickness of 10-150 μm.

The invention relates to a composite solid electrolyte membrane, a preparation method thereof, and a solid battery. The composite solid electrolyte membrane includes a multilayer electrolyte layer composited in the thickness direction, the electrolyte layer contains an inorganic solid electrolyte and a polymer electrolyte, and in the direction from the positive electrode side to the negative electrode side of the composite solid electrolyte membrane, in each electrolyte layer, The content gradient of the inorganic solid electrolyte decreases, and the content gradient of the polymer electrolyte increases. The composite solid electrolyte membrane provided by the present invention has a high content of inorganic solid electrolyte on the positive electrode side, can withstand higher voltages, improves lithium ion conductance, and has a high content of polymer electrolyte on the negative electrode side, which can better inhibit lithium dendrites and alleviate The volume expansion of the negative electrode and the differentiated design of the electrolyte membrane make full use of the characteristics of the positive and negative electrodes. While ensuring high ionic conductivity, it achieves high pressure resistance and suppresses the volume expansion of lithium dendrites and negative electrodes.

The invention relates to an electrolytic solution for a lithium-sulfur battery. The electrolytic solution comprises an electrolyte and a solvent, and is further added with a positive electrode protection agent, wherein the protection agent is one or more than two selected from N,N-carbonyldiimidazole (CDI), N,N-carbonyldiimidazolesulfamide and thiocarbonyldiimidazole, and the addition amount of the positive electrode protection agent is 0.1-5% of the mass of the active substance contained in the positive electrode of a lithium-sulfur battery. Compared to the electrolytic solution in the priorart, the electrolytic solution of the present invention has the following characteristics that the solvent contains the positive electrode protection agent (containing -N bond / -S bond), such that thedissolved sulfur or polysulfide can be effectively adsorbed, the shuttle effect in the lithium-sulfur battery can be inhibited, and the coulombic efficiency of the battery can be improved so as to improve the cycle stability of the battery.

The invention discloses a preparation method and application of a negative electrode with a lithium / lithiated metal oxide frame composite structure. The method is as follows: 1. x , conductive carbon and PVDF are mixed and evenly coated on the current collector, and after vacuum drying, MO x Pole piece; 2. Using metal lithium sheet as negative electrode, MO x The pole piece is used as the counter electrode, the battery is assembled, the constant current discharge is performed, the cut-off voltage is controlled, and the Li y MO x Electrode frame; three, the Li y MO x The electrode frame is mixed with molten lithium to obtain a composite structure negative electrode, and a solid-state electrolyte is used to assemble an all-solid-state battery. In the present invention, the embedded transition metal oxide MO x As a carrier, Li with fast ion transport properties is formed after lithium intercalation y MO x Electrode frame, and then uniformly deposit metallic lithium inside the frame, thereby inhibiting the growth of lithium dendrites and avoiding safety accidents.

A lithium dendrite-free anode with a carbon nanotube film directly compounding molten lithium metal and a preparation method thereof relate to a lithium dendrite-free anode obtained by directly infiltrating a carbon nanotube film with liquid lithium and a preparation method thereof. The heat exchange between the carbon nanotubes and the environment has a temperature gradient in the direction perpendicular to the surface of the material. Adjusting the temperature gradient can make the liquid lithium metal and the upper carbon nanotube film generate negative Gibbs free energy, which in turn drives the liquid lithium metal to infiltrate into the upper carbon nanotube film. The composite material formed by liquid lithium directly and uniformly coated or poured into the carbon nanotube film can be used as an anode for a lithium-free dendrite lithium metal battery with a three-dimensional nanostructure. At ultra-high current density, the lithium-carbon nanotube film composite anode can achieve stable operation without lithium dendrites in symmetrical batteries, and when it is used as an anode in a lithium-sulfur full battery, it can achieve high-rate cycle stability of the battery. The preparation process of the invention is simple and practical, the control is convenient, the large-scale commercial production is easy to be realized, and the lithium dendrite can be effectively suppressed, thereby providing a guarantee for expanding the application field of the lithium metal battery.