Negative electrode active material, negative electrode comprising same, secondary battery comprising same, and method for preparing negative electrode active material

• Main Authors: OH IL GEUN, PARK, HEE-YEON, CHOI JUNG HYUN, LEE YONG-JU, SHIN SUN YOUNG, PARK SE MI
• Format: Patent
• Language: Chinese; English
• Published: 12.01.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a negative electrode active material, a negative electrode comprising the same, a secondary battery comprising the same, and a method for manufacturing the negative electrode active material, the negative electrode active material comprising: silicon-based particles comprising SiOx (0lt; xlt; 2) and Li and having a first carbon layer disposed on at least a portion of the surface; and a second carbon layer provided on at least a portion of the silicon-based particles, in which the ratio of D band peak intensity to G band peak intensity (D/G band ratio) is 1.0 or more when analyzed by Raman spectroscopy, and (C element content)/(Li element content + C element content) is 0.6 or more when analyzed by X-ray photoelectron spectroscopy (XPS). 本发明涉及一种负极活性材料、包含其的负极、包含其的二次电池以及制造所述负极活性材料的方法，所述负极活性材料包含：硅系粒子，包含SiOx(0<x<2)和Li并且具有设置在表面的至少一部分上的第一碳层；以及设置在所述硅系粒子的至少一部分上的第二碳层，其中当通过拉曼光谱的方式分析时，D带峰强度对G带峰强度之比(D/G带比)为1.0以上，并且当通过X射线光电子能谱(XPS)的方式分析时，(C元素含量)/(Li元素含量+C元素含量)为0.6以上。