Si-coated SiOx-TiN/C composite negative electrode material, preparation method and lithium ion battery

• Main Authors: WANG JIN, XIE JIAO
• Format: Patent
• Language: Chinese; English
• Published: 25.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention provides a Si (at) SiOx-TiN/C composite negative electrode material, a preparation method and a lithium ion battery, and relates to the technical field of sodium ion batteries, the preparation method comprises the following steps: adding nano silicon into an alcohol solvent containing a surfactant to obtain a stable suspension; dropwise adding a titanium source into the turbid liquid to obtain a mixture A; transferring the mixture A into a hydrothermal kettle for hydrothermal reaction to obtain the Si-coated TiO2 composite negative electrode material; carrying out ball milling and mixing on the Si-coated TiO2 composite negative electrode material and a cracked carbon precursor or high-conductivity carbon to obtain a mixture B; and heating the mixture B under the protection of nitrogen, and cooling to room temperature to obtain the Si-coated SiOx-TiN/C composite negative electrode material. Compared with the prior art, when the Si (at) SiOx-TiN/C composite negative electrode material is used as a