6results about How to "Good cycle reversibility" patented technology

This invention discloses a hydrogen-assisted rechargeable battery method for hydrogen storage and production, belonging to the field of hydrogen energy storage and electrochemical energy storage technology. The method includes four core steps: battery assembly, circulating electrolyte supply, charging for hydrogen storage, and discharging for hydrogen production. During charging, hydrogen-containing gas is introduced into the cathode, where a hydroxide reaction occurs, and metal ion reduction and deposition occur at the anode, storing hydrogen energy as a metallic element in a solid state under normal pressure. During discharging, a metal oxidation and dissolution reaction occurs at the anode, and a hydrogen evolution reaction occurs at the cathode, generating hydrogen gas in situ and releasing hydrogen energy on demand. This invention eliminates the oxygen evolution reaction of traditional water electrolysis, using hydroxide coupled with metal oxidation-reduction to achieve hydrogen energy storage and release. It offers high storage safety, low reaction overpotential, high energy efficiency, and good cycle reversibility, solving the problems of poor safety, high energy consumption, and low energy efficiency in existing hydrogen storage technologies. It can be widely applied to renewable energy hydrogen production, large-scale hydrogen energy storage, and distributed hydrogen energy supply scenarios.

The invention provides an aqueous zinc ion battery electrolyte, a preparation method and application thereof and an aqueous zinc battery, the electrolyte comprises a solvent, a zinc salt and an additive, and the additive is a borate derivative. A boron element of a borate compound in the electrolyte has an empty p orbit, and a functional site is coordinated with an oxygen element to form a three-dimensional structure containing three oxygen sites; and the formed compound not only can be adsorbed to the surface of a zinc negative electrode to reduce the adsorption quantity of free water molecules on the zinc surface, but also can chemically react with zinc atoms to form an in-situ interface protection layer, and can inhibit side reactions such as corrosion, passivation and the like. On the other hand, oxygen-containing sites of the borate additives are coordinated with zinc ions, coordination of water molecules and the zinc ions is reduced, and the reversible deposition / stripping behavior of the zinc ions is optimized. The electrolyte is simple in preparation process and low in cost, and the zinc negative electrode shows excellent cycle reversibility and interface stability under the condition of extremely low dosage, so that the battery has excellent cycle performance.

The application provides a polyquinopamine positive electrode material and a preparation method and application thereof. The polyquinopamine positive electrode material has a specific microstructure, can stably embed multivalent ions, is suitable for being used as a positive electrode material of a multivalent ion battery, and is hardly soluble in an electrolyte, so that application of the polyquinopamine positive electrode material to an ion battery can effectively inhibit loss of an active material. The preparation method comprises the following steps: dissolving 2,3,4,6-tetrachlorobenzoquinone and 1,2-cyclohexanediamine in a reaction solvent, and performing a condensation reaction under heating in inert gas protection; performing suction filtration after the reaction is completed to obtain a filter cake; performing washing on the filter cake with a washing solvent and then drying to obtain the polyquinopamine positive electrode material. The polyquinopamine positive electrode material is applied to a zinc ion battery, and the highest discharge specific capacity can reach 187 mAh g ‑1 at a current density of 0.02 Ag ‑1 , and the discharge specific capacity can be maintained at 90 mAh g ‑1 after 200 charge-discharge cycles.

The application provides a polyquinamine organic positive electrode material and a preparation method thereof. The polyquinamine organic positive electrode material is hardly soluble in an electrolyte, can effectively inhibit active material loss when applied to an ion battery, has a stable configuration structure of embedding multivalent ions, and is suitable for a multivalent ion battery. The polyquinamine organic positive electrode material is prepared by the following two methods: method one: 1,4-benzoquinone and 1,2-cyclohexanediamine are used as reaction raw materials, dissolved in a reaction solvent, and subjected to an oxidative addition reaction for preparation; and method two: 2,5-dichloro-1,4-benzoquinone and 1,2-cyclohexanediamine are used as reaction raw materials, dissolved in a reaction solvent, and subjected to a condensation reaction under inert gas protection for preparation. The polyquinamine organic positive electrode material exhibits good capacity performance and cycle performance in a zinc ion battery, and the highest discharge specific capacity can reach 138 mAh g ‑1 -1 under a current density of 0.02 Ag ‑1 -1, and the discharge specific capacity can be maintained at 78 mAh g ‑1 -1 after 200 charge-discharge cycles.