Samsung Sdi Co., Inc.

Chungyoo Lee

Yury Matulevich

Jaehyuk Kim

Soonsung Suh

Seunguk Kwon

Heeyoung Chu

Changui Jeong

Sungwan Moon

Seunguh Kwon

Yohan Park

Jongseo Choi

Sunghwan Moon

A negative electrode active material and a secondary battery including the same are provided. More particularly, the present disclosure relates to a negative electrode active material including a Si-metal alloy including Si, the Si being present in the Si-metal alloy in an amount of 66 at % or less, and at least a portion of the Si being crystalline Si. The negative active material can provide a high-capacity battery, which can retain high capacity due to little volumetric expansion during charging and discharging, thereby demonstrating an excellent life characteristic of the secondary battery. The negative electrode active material may include a Si-metal alloy including crystalline Si having a crystal grain size of 30 nm or less. Methods of preparing a negative electrode active material and methods of preparing a secondary battery including the same are also disclosed.

Negative electrode active material and secondary battery including the same

Growing community of inventors

Yongin-si, South Korea

Chungyoo Lee