Negative active material for secondary battery, negative electrode and lithium battery each including negative active material, and method of preparing negative active material

• Main Authors: Oh, Kyuhwan, Kim, Jaehyuk, Suh, Soonsung, Kang, Chansoon, Hong, Soonho, Cho, Jongsoo
• Format: Patent
• Language: English
• Published: 30.04.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Provided is a negative active material for a secondary battery which provides high capacity, high efficiency charging-discharging characteristics. The negative active material includes: a silicon single phase; and a silicon-metal alloy phase interfaced with the silicon single phase and surrounding the silicon single phase, wherein an X-ray diffraction spectrum of the negative active material has first and second peaks that are originated from the silicon-metal alloy phase, and the first peak is located at 49.1+/−0.5 degrees (°) and the second peak is located at 38.0+/−0.5 degrees (°), and a diffraction intensity of the first peak is 2 or less times that of to the second peak.