Lg Chem, Ltd

Ulsan National Institute of Science and Technology

Unist-academy Industry Research Corporation

Sj Materials Co., Ltd.

Mi Rim Lee

Yong Ju Lee

Je Young Kim

Jung Woo Yoo

Yoon Ah Kang

Hye Ran Jung

Eun Kyung Kim

Han Ho Lee

Jae Phil Cho

Seung Youn Choi

Jung In Lee

Soo Jin Park

Mi Kyeong Lee

Byoung Man Bang

Ji Hyun Yoon

Il Kyo Jeong

Chang Rae Lee

Hong Kyu Park

Rae Hwan Jo

Hyun Chul Kim

Dong Sub Jung

Sung Man Lee

Jun Sik Ham

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 anode active material including a core part including silicon (Si) and MSi, and a shell part including Si and a plurality of pores on the core part, wherein, in the MSi, M is at least one element selected from the group consisting of Group 2A, 3A, and 4A elements and transition metals, 1&#x2264;x&#x2264;4, and 1&#x2264;y&#x2264;4, and a method of preparing the porous silicon-based anode active material. According to an embodiment of the present invention, capacity characteristics and lifetime characteristic of a lithium secondary battery may be improved by minimizing the volume expansion of an anode active material during charge and discharge.

Anode active material and method of preparing the same

Provided are an anode active material including a porous silicon oxide-carbon material composite which includes a porous silicon oxide including pores and a line-type carbon material coated on a surface, in the pores, or on the surface and in the pores of the porous silicon oxide, and a method of preparing the anode active material. Since the silicon oxide of the anode active material according to an embodiment of the present invention may include the plurality of pores, resistance to the mechanical stress due to a volume change may be improved. Also, since the line-type carbon material is bonded to the inside of the pores, conductivity may not be decreased even in the case in which internal cracks occur in the porous silicon oxide and lifetime characteristics may be improved.

Anode active material including porous silicon oxide-carbon material composite and method of preparing 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

Disclosed herein is an electrode active material for a secondary battery, and more particularly to an electrode active material comprising a porous silicon oxide-based composite and the method for preparing a porous silicon oxide-based composite.

Electrode active material for secondary battery

Provided are a porous silicon-based anode active material including crystalline silicon (Si) particles, and a plurality of pores on surfaces, or the surfaces and inside of the crystalline silicon particles, wherein at least one plane of crystal planes of at least a portion of the plurality of pores includes a (100) plane, and a method of preparing the porous silicon-based anode active material. Since a porous silicon-based anode active material of the present invention may allow volume expansion, which is occurred during charge and discharge of a lithium secondary battery, to be concentrated on pores instead of the outside of the anode active material, the porous silicon-based anode active material may improve life characteristics of the lithium secondary battery by efficiently controlling the volume expansion.

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

Disclosed herein is a silicon-based anode active material, comprising a silicon phase, a SiO(0&#x3c;x&#x3c;2) phase and a carbon dioxide phase. Also disclosed is a secondary battery, which comprises a cathode comprising a cathode active material, an anode active material comprising an anode active material, and a separator, wherein the anode active material comprises a silicon phase, an SiO(0&#x3c;x&#x3c;2) phase and a silicon dioxide phase.

Silicon-based anode active material and secondary battery comprising the same

Provided is an anode including an anode active material including SiO(0&#x3c;x&#x2266;1) and a carbon material having a surface coated with amorphous carbon, wherein a crystal orientation ratio is in a range of 0.07 to 0.17. A lithium secondary battery including the anode of the present invention may have improved life characteristics, low thickness change rate, and improved initial discharge capacity.

Anode including silicon-based material and carbon material, and lithium secondary battery including the same

The present invention relates to a silicon-based composite including a silicon oxide which is coated thereon with carbon and bonded therein to lithium. The present invention also relates to a method of producing a silicon-based composite, comprising coating a surface of silicon oxide with carbon, mixing the silicon oxide coated with carbon with lithium oxide, and heat-treating a mixture of the silicon oxide coated with carbon and the lithium oxide in an inert atmosphere.

Silicon-based composite and production method thereof

Provided are a porous composite expressed by Chemical Formula 1 and having a porosity of 5% to 90%, and a method of preparing the same:MO&#x2003;&#x2003;&#x3c;Chemical Formula 1&#x3e; According to the present invention, since a molar ratio (x) of oxygen to a molar ratio of (semi) metal in the porous composite is controlled, an initial efficiency of a secondary battery may be increased. Also, since the porous composite satisfies the above porosity, a thickness change rate of an electrode generated during charge and discharge of the secondary battery may be decreased and lifetime characteristics may be improved.

Porous composite and manufacturing method thereof

Disclosed herein is a porous silicon-based electrode active material, comprising a silicon phase, a SiO(0&#x3c;x&#x3c;2) phase and a silicon dioxide phase and having a porosity of 7-71%.

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Daejeon, South Korea

Mi Rim Lee