Lithium ion battery negative electrode material and preparation method thereof

• Main Authors: ZHANG FENLI, YANG SHUTING, JIA WEIXIAO, ZHENG YANHUI
• Format: Patent
• Language: Chinese; English
• Published: 26.10.2021
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a lithium ion battery negative electrode material preparation method, and the method comprises steps: 1, adding a tin salt and a vanadium salt to a carbon source dispersion liquid, performing uniform mixing under a water bath condition, and performing drying into solid powder, wherein the molar ratio of vanadium to tin is (1: 9)-(9: 1), and the addition amount of the carbon source is 100 g per mole of vanadium; 2, carrying out heat treatment on the obtained solid powder for 2-4 hours at 550-700 DEG C under the protection of non-oxidizing gas to obtain a carbon-coated vanadium tin oxide; 3, mixing the obtained carbon-coated vanadium tin oxide with a carbon material to obtain the lithium ion battery negative electrode material, wherein the mass percent of the carbon-coated vanadium tin oxide is 5-10%. The invention also provides the lithium ion battery negative electrode material prepared by the method. According to the lithium ion battery negative electrode material prepared by the inve