Abstract: This application provides a yolk core-shell structured composite material, a preparation method of the material, and a secondary battery containing the material. The yolk core-shell structured composite material includes a core and a shell. A cavity exists between the core and the shell. The core includes a phosphorus-doped silicon material, and the shell includes a nitrogen-doped carbon material. This application can improve a capacity and a capacity retention rate of the battery.

Abstract: An electrode assembly, a battery, a battery module, a battery pack and a powered device are provided. The electrode assembly comprises a first electrode piece, a second electrode piece with opposite polarity to the first electrode piece, and a separator arranged between the first electrode piece and the second electrode piece; the electrode assembly is obtained by winding the first electrode piece, the second electrode piece and the separator; and the separator comprises a base film and a coating provided on at least part of the surface of the base film, and the coating comprises a hydraulic inorganic material capable of hardening upon reaction with water. The present application can solve the problem of central hole collapse in the electrode assembly and the battery, and improve the safety performance and cycle performance of the battery.

Abstract: A thermal decoy system contains electro-resistive fabric which warms the air within a polymer envelope transmissive to infrared radiation. The thermal decoy system thereby produces a thermal signature comparable to that of a human, which will preemptively trigger passive-infrared sensors, thereby neutralizing such sensors' capability to detect nearby persons.

Abstract: A method of forming a crosslinked polyphenol, the method comprising: reacting a bio-based phenolic compound comprising at least one phenolic hydroxyl group, with a crosslinking agent comprising at least two functional groups reactive with the phenolic hydroxyl group, wherein the at least two functional groups are each independently a halogen group, acid halide group, sulfonyl halide group, glycidyl group, anhydride group, or a combination comprising at least one of the foregoing, to provide the crosslinked polyphenol.

Abstract: A synergistic flame retardant composition comprising a phenolic compound comprising condensed tannin, hydrolysable tannin, lignin, cardanol, quercetin, catechin, epicatechin, anthocyanidin, catechol, dopamine, hydroxytyrosol, adrenaline, 4-hydroxyphenylacetic acid, gallic acid, digallic acid, methyl gallate, ellagic acid, phloroglucinol, hexahydroxydiphenic acid, luteic acid, casuarictin, or a combination thereof; and a phosphorus-containing compound comprising a C5-7 carbocyclic polyol substituted with at least one phosphate group.

Abstract: A method of forming a crosslinked polyphenol, the method comprising: reacting a bio-based phenolic compound comprising at least one phenolic hydroxyl group, with a crosslinking agent comprising at least two functional groups reactive with the phenolic hydroxyl group, wherein the at least two functional groups are each independently a halogen group, acid halide group, sulfonyl halide group, glycidyl group, anhydride group, or a combination comprising at least one of the foregoing, to provide the crosslinked polyphenol.