Abstract: The present disclosure relates to positive-electrode pre-lithiation agents. One example positive-electrode pre-lithiation agent includes a catalyst and a lithium-rich material, where the catalyst is an oxide positive-electrode active material, an intensity ratio of a crystal plane diffraction peak of the catalyst to a crystal plane diffraction peak of the catalyst is less than or equal to 2, the catalyst is configured to catalyze the lithium-rich material to decompose to release active lithium, and the lithium-rich material includes at least one of lithium oxide, lithium peroxide, lithium fluoride, lithium carbonate, lithium oxalate, or lithium acetate.

Abstract: Silicon carbon composite materials, preparation methods and applications of the silicon carbon composite material are provided. The silicon carbon composite material includes a core and a carbon coating layer. At least one part of a surface of the core is covered by the carbon coating layer. The core includes a carbon matrix and SiOx particles, the carbon matrix is continuously distributed and includes N channels in communication with outside, and the SiOx particles are filled in the channels. A size of the SiOx particle is 0.1 nm to 0.9 nm, 0.9?x?1.7, and N?1 and is an integer.

Abstract: In fields related to battery cathode material technologies, a nano-silicon composite material and a preparation method thereof, an electrode material, and a battery are provided to resolve large volume expansion of a cathode material of a battery and a serious side reaction with an electrolyte. The nano-silicon composite material includes a core, a first coating layer, and a second coating layer. The core includes a nano-silicon crystal. The first coating layer covers a surface of the core. The first coating layer is of a porous structure. A material of the first coating layer includes bisilicate and silicon oxide in a deoxidized state. The second coating layer covers a surface of the first coating layer. A material of the second coating layer includes silicon dioxide in a deoxidized state.

Abstract: A silicon-based negative electrode material and a method for preparing the same, a battery including the silicon-based negative electrode material, and a terminal are provided. The silicon-based negative electrode material includes a silicon-based matrix with a low silicon-oxygen ratio and silicon-based particles with a high silicon-oxygen ratio dispersed in the silicon-based matrix with the low silicon-oxygen ratio. A silicon-oxygen ratio of the silicon-based matrix with the low silicon-oxygen ratio is 1:x, and 1<x?2. A silicon-oxygen ratio of the silicon-based particles with the high silicon-oxygen ratio is 1:y, and 0?y?1. The silicon-based matrix with the low silicon-oxygen ratio is silicon dioxide, or the silicon-based matrix with the low silicon-oxygen ratio includes silicon dioxide and silicon-containing crystal particles dispersed in the silicon dioxide.

Abstract: A silicon-oxygen composite anode material includes a kernel, a coating layer wrapped outside the kernel, and an intermediate layer located between the kernel and the coating layer. The intermediate layer includes the non-lithium silicate, and mass content of the non-lithium silicate in the intermediate layer progressively decreases from the intermediate layer to the kernel. The progressive decrease includes a gradient decrease from the intermediate layer to the kernel. The gradient decrease refers to that mass proportions on a circumference with a same distance from a center of the kernel are the same, and the mass proportion decreases gradually as the distance from the center of the kernel decreases. The non-lithium silicate is generated in situ at an outer layer of the kernel, and has a non-water-soluble, non-alkaline, or weak-alkaline dense structure.