7 results about "Lithium–air battery" patented technology

Nanoporous carbon-based scaffolds or structures, and specifically carbon aerogels and their manufacture and use thereof. Embodiments include a cathode material within a lithium-air battery, where the cathode is formed of a binder-free, monolithic, polyimide-derived carbon aerogel. The carbon aerogel includes pores that improve the oxygen transport properties of electrolyte solution and improve the formation of lithium peroxide along the surface and / or within the pores of the carbon aerogel. The cathode and underlying carbon aerogel provide optimal properties for use within the lithium-air battery.

This invention provides a metal covalent organic framework material and its preparation method, as well as a positive electrode sheet for a lithium-air battery, belonging to the field of lithium-air battery technology. The metal covalent organic framework material represented by Formula I is a one-dimensional metal covalent organic framework material, avoiding the problem of insufficient utilization of active sites within a two-dimensional layered structure, thus improving the discharge specific capacity and cycle stability of the lithium-air battery. In Formula I, the electronegativity of the two nitrogen atoms in the two pyridine rings induces local positive charges at the M center, forming strong Lewis acid sites. Simultaneously, ligand-metal charge transfer enhances the conductivity and electron delocalization of the active sites in the metal covalent organic framework material, improving the discharge specific capacity of the lithium-air battery. Furthermore, the M atoms are anchored to the metal covalent organic framework material framework through coordination bonds, maintaining the active site density and structural integrity of the metal covalent organic framework material, thereby improving the cycle stability of the lithium-air battery.

The application discloses a bismuth telluride / antimony telluride heterojunction anode catalyst for a lithium air battery and a preparation method thereof, and belongs to the technical field of lithium air batteries. The bismuth telluride / antimony telluride heterojunction anode catalyst for the lithium air battery comprises bismuth telluride / antimony telluride nanosheets, the bismuth telluride / antimony telluride nanosheets are formed by epitaxial growth of antimony telluride on the surface of bismuth telluride to form a lateral heterojunction, and when the bismuth telluride / antimony telluride nanosheets are used as an anode catalyst of a lithium air battery, the specific capacity of the battery can be improved, the overpotential can be reduced, and the cycle stability can be improved; even in an air environment, the first discharge capacity of the lithium air battery can reach more than 8000 mAh / g at 500 mA / g, and the lithium air battery can be cycled more than 350 times at a high current density of 1000 mA / g and a cut-off capacity of 500 mAh / g, and excellent cycle performance is maintained.

The application discloses a kind of MoS2-coated porous M-N-C single-atom catalyst and its application in lithium-air battery, first by chelating agent transition metal ion chelation and anchor on porous carbon carrier, then mixed with nitrogen source precursor and calcined, obtain with porous nitrogen-doped carbon as carrier, load transition metal single atom M Material, again by hydrothermal sulfidation method and high-temperature calcination layer MoS2 Nanometer sheet, obtain target catalyst material.The composite material obtained by the application has higher mass transfer efficiency, higher oxygen reduction activity and stability in acidic and alkaline medium, and has lower overvoltage, high discharge specific capacity and excellent cycle performance when used as lithium-air battery catalyst, and has good research prospect.

This invention relates to the field of lithium-air battery electrolyte technology, specifically to an electrolyte for lithium-air batteries and a lithium-air battery. The electrolyte for lithium-air batteries comprises functional additives, lithium salts, and a solvent. The functional additives include tin tetrachloride and 1,8-diiodooctane, with the concentration of tin tetrachloride in the electrolyte being 0.01-0.1 mol / L and the concentration of 1,8-diiodooctane being 0.05-0.2 mol / L. During battery cycling, the electrolyte of this invention simultaneously achieves the dual functions of reducing overpotential through redox mediating and inhibiting dendrite growth by constructing an artificial SEI film in situ at the negative electrode, thereby achieving long-term protection of the lithium negative electrode and significantly improving the long-cycle stability of the battery, demonstrating very high practical value.

The application discloses a multivalent state manganese modified CoSe2-rGO composite material and application thereof in lithium air batteries, and a preparation method thereof, which comprises the following steps: uniformly mixing manganese salt, cobalt salt, urea, rGO and PVP in an ethanol aqueous solution through ultrasonic mixing, and then preparing a cobalt manganese hydroxide-rGO composite precursor through a hydrothermal method; and grinding and mixing the composite precursor and selenium powder, and then calcining under an inert atmosphere at high temperature to obtain the target composite material. The preparation process is simple, and the cost is low. The obtained composite material has a low overpotential, a high discharge specific capacity and excellent cycle performance when used as a lithium air battery positive electrode catalyst, and has a good research prospect.

This invention provides a self-grown nitrogen-doped carbon nanotube composite material based on a MOF template. The composite material uses a cobalt salt as the metal center and an organic compound as the ligand to synthesize a metal-organic framework template, followed by the autocatalytic generation of nitrogen-doped carbon nanotubes under an inert atmosphere. The preparation method includes: first, preparing a MOF template using a cobalt salt and organic ligand; then, introducing a nickel source onto the template surface via a hydrothermal reaction to obtain a composite precursor; finally, using dicyandiamine as both a nitrogen and carbon source, stepwise calcining the composite precursor to allow in-situ growth of MOF-template-derived carbon nanotubes, simultaneously forming a Ni / Co2N alloy to obtain the composite material. The composite material of this invention possesses a stable structure and excellent catalytic activity. Using it as a cathode catalyst in lithium-air batteries can effectively reduce polarization during the charge-discharge reaction process, improve the battery's rate capability and cycle performance, and the preparation process is relatively simple, showing promising application prospects.