Negative electrode active material, negative electrode for battery and battery

• Main Authors: WANG CONG, CHEN ZHIHUAN, YAN LONG, ZOU YUN, NIU YAQI, PAN FUZHONG
• Format: Patent
• Language: Chinese; English
• Published: 10.06.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METALLURGY; NON-METALLIC ELEMENTS; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TESTING

The negative electrode active material comprises a core material, the core material comprises silicon atoms, combined oxygen atoms and metal atoms, the core material is provided with a detection area, the number ratio of the silicon atoms to the oxygen atoms in all positions in the detection area is set to be Y, Y is any positive number, and the number of the silicon atoms to the number of the oxygen atoms in all positions in the detection area is equal to or smaller than the number of the metal atoms. In the detection area, the number ratio of metal atoms at any two positions is not less than 0.8 and not more than 1.25, and the Y value ratio of any two positions is not less than 0.75 and not more than 4/3; and a coating layer containing a carbon element, the coating layer covers at least a part of the surface of the core material, and the mass percentage content of the carbon element in the negative electrode active material is 1.5-6.0%. In the invention, an element characterization method is adopted, the in