2results about How to "Improve lyophilicity" patented technology

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.

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.