Abstract: A low water content cathode material, a preparation method thereof, and a lithium-ion battery are provided. The low water content cathode material includes: a cathode material core, and an outer film layer being coated outside the cathode material core, in which, the outer film layer includes at least one carbon-based layer formed by an oxygen-free carbon source. In the preparation method, by coating a cathode material precursor with an oxygen-free carbon source, a resulting cathode material itself has a water content of 600 ppm or below and has the function of a protective film, such that the cathode material has low water absorption when exposed to a humid environment, and can improve the safety performance of a lithium-ion battery.

Abstract: The application discloses a single-core multi-shell lithium manganese iron phosphate cathode material and a preparation method thereof, and a secondary battery. The composite material includes: a carbon-coated lithium iron phosphate core, and a plurality of lithium manganese iron phosphate cladding layers cladded on an outer surface of the carbon-coated lithium iron phosphate core. Each of the plurality of lithium manganese iron phosphate cladding layers includes lithium manganese iron phosphate particles and a carbon material coated on the lithium manganese iron phosphate particles. The lithium manganese iron phosphate particles in the plurality of the lithium manganese iron phosphate cladding layers have particle sizes increase in a radial direction from inside to outside.

Abstract: The present application belongs to battery materials, and in particular, to a lithium-containing multi-phosphate cathode material and a preparation method therefor, and a secondary battery. The lithium-containing multi-phosphate cathode material includes a single-core multi-shell lithium manganese iron phosphate composite material, the composite material includes a core of lithium iron phosphate or lithium manganese iron phosphate, N lithium manganese iron phosphate coating layers coated on an outer surface of the core, and a carbon coating layer coated on an outermost layer of the composite material; N is an integer greater than or equal to 1; a manganese content in the N lithium manganese iron phosphate coating layers successively increases in a radially outward direction, and a particle size of the lithium manganese iron phosphate particles in the N lithium manganese iron phosphate coating layers successively decreases in the radially outward direction.

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.