Lg Chem, Ltd

Sj Materials Co., Ltd.

Chang Rae Lee

Yong Ju Lee

Eun Kyung Kim

Jung Woo Yoo

Han Ho Lee

Mi Rim Lee

Byoung Man Bang

Mi Kyeong Lee

Ji Hyun Yoon

Il Kyo Jeong

Provided are a porous silicon-based anode active material including porous SiOparticles (0&#x2264;x&#x3c;2) having surfaces coated with an oxide layer, a method of preparing the same, and a lithium secondary battery including the porous silicon-based anode active material. Since the anode active material includes an oxide layer formed on the porous SiOparticles (0&#x2264;x&#x3c;2), a reactivity between the anode active material and an electrolyte solution may be reduced and, as a result, an electrical short circuit in an electrode may be minimized. Also, since a plurality of pores is included in surfaces or the surfaces and inside of the SiOparticles, a thickness change rate of the electrode generated during charge and discharge of a secondary battery may be reduced and lifetime characteristics may be improved.

Porous silicon-based anode active material, method for preparing the same, and lithium secondary battery comprising the same

Provided are a porous silicon-based particle including a silicon (Si) or SiO(0&#x3c;x&#x3c;2) particle, wherein the particle includes a plurality of nonlinear pores, and the nonlinear pores are formed as open pores in a surface of the particle, and a method of preparing the porous silicon-based particles. Porous silicon-based particles according to an embodiment of the present invention may be more easily dispersed in an anode active material slurry, may minimize side reactions with an electrolyte, and may reduce volume expansion during charge and discharge. Also, according to an embodiment of the present invention, the shape, form, and size of pores formed in the porous silicon-based particle may be controlled by adjusting the type of a metal catalyst, the concentration of the catalyst, and etching time.

Porous silicon-based particles, method of preparing the same, and lithium secondary battery including the porous silicon-based particles

Growing community of inventors

Ulsan, South Korea

Chang Rae Lee