Abstract: A cathode lithium-supplementing additive, a preparation method for the cathode lithium-supplementing additive and an application of the cathode lithium-supplementing additive. The cathode lithium-supplementing additive includes a lithium-containing core and an encapsulation layer covering a surface of the lithium-containing core. The encapsulation layer has pores and/or cracks and a sealing agent distributed at least at the pores and/or cracks for blocking the pores and/or cracks, where a material of the sealing agent includes an organic hydrophobic material. The sealing agent provided includes the organic hydrophobic material that can be embedded in the pores of the encapsulation material to further fill gaps in the sealing material, thus, a dense film layer is formed.

Abstract: The present application discloses a lithium-supplementing additive, and a preparation method therefor and an application thereof. The lithium-supplementing additive comprises a particulate lithium-supplementing material and also comprises lithium fluoride; moreover, the lithium fluoride is at least bonded to the surface of the lithium-supplementing material, and the lithium fluoride is generated by the reaction between an organic fluorine source and residual alkali contained in the lithium-supplementing material.

Abstract: A cathode lithium-supplementing additive, a preparation method thereof, and an application thereof are disclosed. The cathode lithium-supplementing additive of the present application includes a lithium-supplementing material, the lithium-supplementing material includes fluorine atoms, and the fluorine atoms replace oxygen atoms in the lithium-supplementing material and are in oxygen vacancies. According to the present application, the cathode lithium-supplementing additive is doped with fluorine, has relatively good high-voltage stability and thermal stability and relatively high rate performance, reduces the content of residual alkali, has high storage stability and good processability, and can also reduce gas production, thereby improving the cycle performance, electrochemical performance, and safety performance of a corresponding battery.

Abstract: Disclosed are a lithium-rich composite material, and a preparation method thereof, and an application thereof. The lithium-rich composite material includes a core and a dense hydrophobic layer coated on the core. The core includes a lithium-rich material, and a material of the dense hydrophobic layer includes a polyanionic electrochemically active material, and the polyanionic electrochemically active material is a phosphate electrode active material. The lithium-rich composite material of the present application includes a dense hydrophobic layer, which has high compactness, low content of residual alkali and high chemical stability when being in contact with an electrolyte. In addition, the preparation method of the lithium-rich composite material can ensure that the structure and the electrochemical performances of the prepared lithium-rich composite material are stable; moreover, the efficiency is high and the production cost is saved.

Abstract: A cathode lithium-supplementing additive, a preparation method, and an application thereof are provided. The cathode lithium-supplementing additive includes: a lithium-containing core, and a coating layer formed on a surface of the lithium-containing core, in which, a material of the coating layer is selected from a conductive hydrophobic polymer having a surface modified with a hydrophobic enhancer. On the one hand, the formed coating layer can make up for the defect that the lithium-containing compound itself has poor electronic conductivity and can improve the electronic conductivity, in the meanwhile reduce the amount of conductive agent to be added to the electrode plate; and on the other hand, since the polymer has the surface modified with the hydrophobic enhancer, hydrophobic groups are provided, which further provides a hydrophobic barrier, so as to effectively improve the stability of the lithium-containing core in the air.

Abstract: A lithium-supplementing additive, a preparation method therefor and application thereof. The lithium-supplementing additive includes a core body and a functional encapsulation layer coated on the core body, and the core body includes a lithium-supplementing material. Lithium carbonate is dispersed in the interface between the functional encapsulation layer and the core body or/and in the functional encapsulation layer. In the lithium-supplementing additive of the present application, the lithium carbonate dispersed in the interface between the functional encapsulation layer and the core body or/and in the functional encapsulation layer has a synergistic effect with the functional encapsulation layer, and can effectively improve the effect of the functional encapsulation layer on the core body, so that the core body is isolated from ambient moisture and CO2 to ensure the stability of the core body, thereby ensuring the effect and stability of lithium supplementation of the lithium-supplementing additive.

Abstract: A silicon-based anode material, including a silicon-based core; and a shell layer arranged on the silicon-based core, the silicon-based core comprises SiOx and silicon microcrystals dispersed in the SiOx, where 0.9?x?1.3; and a distribution density of the silicon microcrystals gradually decreases along a direction from a surface of the silicon-based core to the center of the silicon-based core, the shell layer includes a carbon layer. The silicon-based anode material has high capacity and low volume expansion effect, and the battery capacity and cycle performance can be improved in the applications in non-aqueous electrolyte secondary batteries. A preparation method for a silicon-based anode material for lithium-ion batteries.

Abstract: A lithium-replenishing additive is provided. The lithium-replenishing additive includes a lithium-rich-material core and a shell layer disposed at the lithium-rich-material core. The lithium-rich-material core is made of a lithium-rich material with an average chemical formula of aNixMyO2 ·bLi2O, where 0.95?x?1, 0.01?y?0.05, 1?z?1.15, 0.8?a?1.1, 0.8?b?1.1, and the M includes one or more of copper (Cu), cobalt (Co), aluminum (Al), titanium (Ti), vanadium (V), zirconium (Zr), or iron (Fe). The shell layer includes a polymer layer. A preparing method of a lithium-replenishing additive and a lithium secondary battery are further provided.