Samsung Sdi Co., Inc.

Seoul National University

Mk Electron Co., Ltd.

Kyuhwan Oh

Jaehyuk Kim

Soonsung Suh

Jongsoo Cho

Soonho Hong

Chansoon Kang

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+/&#x2212;0.5 degrees (&#xb0;) and the second peak is located at 38.0+/&#x2212;0.5 degrees (&#xb0;), and a diffraction intensity of the first peak is 2 or less times that of to the second peak.

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

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Seoul, South Korea

Kyuhwan Oh