Lg Chem, Ltd

Lg Energy Solution, Ltd.

Hyun Chul Kim

Yong Ju Lee

Eun Kyung Kim

Jung Hyun Choi

Je Young Kim

Jung Woo Yoo

Su Jin Park

Yoon Ah Kang

Rae Hwan Jo

Han Nah Jeong

Cheol Hee Park

Sang Yun Jung

Ju Ho Chung

Mi Rim Lee

Byung Kyu Lim

Seung Youn Choi

The present specification relates to a negative electrode active material which includes a silicon-based composite represented by SiO(0&#x2264;a&#x3c;1), and a carbon coating layer distributed on a surface of the silicon-based composite, and which has a bimodal pore structure including nanopores and mesopores. In a lithium secondary battery including the negative electrode active material, an oxygen content in the silicon-based composite can be controlled to improve initial efficiency and capacity characteristics, and a specific surface area can also be controlled, and thus a side reaction with electrolyte can be reduced.

Negative electrode active material for lithium secondary battery and method of preparing the same

A negative electrode active material particle and a method for preparing the same are provided. The negative electrode active material particle includes SiO(0&#x3c;x&#x2264;2) and LiSiO, and includes less than 2 wt % of LiSiOand LiSiO.

Negative electrode active particle and method for manufacturing the same

The present specification relates to a negative electrode active material including an amorphous silicon-based composite represented by SiO(0&#x3c;a&#x3c;1); and a carbon coating layer distributed on a surface of the silicon-based composite, and provides a negative electrode active material in which the crystal growth of crystalline silicon in a silicon-based composite prepared by thermal reduction with a metal reducing agent is suppressed in a state where a carbon coating layer is formed, and the ratio of silicon in the composite is high, and a method of preparing the same.

A negative electrode active material of the present invention includes a core containing silicon-based nanoparticles and polymer carbides distributed on the nanoparticles, wherein the core has a size of 30-300 nm, and such a negative electrode active material is prepared using a method including dispersing a suspension in which silicon-based nanoparticles and water-soluble polymer are added to a solvent using ultrasonic waves; and preparing a core including the silicon-based nanoparticles having the polymer carbides on the surface by carbonizing the water-soluble polymer. As a result, a negative electrode active material having a significantly low volume expansion rate compared with general non-carbon-based negative electrode active materials, and having excellent electric conductivity may be provided.

Silicon-based negative electrode active material and method for preparing the same

The present invention relates to a silicon-based active material-polymer composite which is secondary particles in which silicon-based particles as primary particles and conductive polymer particles having a modulus of elasticity of 10 Pa to 100 Pa at a temperature of 20&#xb0; C. to 40&#xb0; C. are uniformly mixed. The uniform mixture with the elastic conductive polymer particles provides for a buffering action against the stress generated by volumetric changes of the silicon-based particles.

Silicon-based active material-polymer composite and method for preparing same

Provided are a negative electrode active material for a lithium secondary battery and a method of preparing the same, wherein since the negative electrode active material includes porous polycrystalline silicon and the porous polycrystalline silicon includes pores disposed at grain boundaries, the negative electrode active material may exhibit a buffering action by internally absorbing changes in volume of the active material during charge and discharge. As a result, lifetime characteristics of a negative electrode and a battery may be improved.

Negative electrode active material for lithium secondary battery, method of preparing the same, and lithium secondary battery including the material

The present invention relates to a negative electrode active material and a secondary battery including the same, and specifically, provides a negative electrode active material particle including a core, which includes a carbon-based active material and an oxygen functional group, and a shell, which surrounds the core and includes a silicon-based active material.

Negative electrode active material and secondary battery including the same

The present disclosure relates to a negative electrode active material and a secondary battery including the same, and in particular, provides a negative electrode active material particle including a core including a carbon-based active material, and a shell surrounding the core and including a polymer, wherein silicon-based active material particles are embedded in the shell, and at least a part of the silicon-based active material particles is exposed to a surface of the shell.

Provided are an anode active material for a lithium secondary battery including a silicon-based composite formed of silicon (Si) and crystalline SiO, wherein the Si and crystalline SiOare in the form of grains, a method of preparing the same, and a lithium secondary battery including the anode active material. Since an anode active material according to an embodiment of the present invention includes a silicon-based composite including Si and SiOin a grain state and the SiOis crystalline SiO, the reaction between amorphous SiOand lithium in an electrolyte may be excluded. Thus, since the crystalline SiOis included in the silicon-based composite, excellent capacity characteristics of a secondary battery may be maintained and initial efficiency and life characteristics may be improved when the silicon-based composite is used as an anode active material.

Anode active material for lithium secondary battery and method of preparing the same

Provided is a method of manufacturing silicon oxide by which an amount of oxygen of the silicon oxide may be controlled. The method of manufacturing silicon oxide may include mixing silicon and silicon dioxide to be included in a reaction chamber, depressurizing a pressure of the reaction chamber to obtain a high degree of vacuum while increasing a temperature in the reaction chamber to a reaction temperature, and reacting the mixture of silicon and silicon dioxide in a reducing atmosphere.

Method of manufacturing silicon oxide

The present invention relates to a method of preparing silicon oxide, in which the amounts of silicon and oxygen are appropriately controlled by decreasing the amount of the oxygen from silicon oxide containing a relatively large amount of oxygen, silicon oxide prepared by the method, and a secondary battery including the same. According to the method of preparing silicon oxide, silicon oxide (first silicon oxide) including a relatively large amount of oxygen is heat treated in a reducing atmosphere to decrease the amount of the oxygen in the silicon oxide (first silicon oxide) and to prepare silicon oxide (second silicon oxide) including silicon and oxygen in an appropriate amount (Si:SiO=1:0.7-0.98), thereby improving capacity and initial efficiency and securing stability and cycle properties (lifetime characteristics) of the secondary battery.

Silicon oxide and method of preparing the same

Provided are an anode active material including silicon oxide particles (SiOx, where x satisfies 0&#x3c;x&#x3c;2), fiber-type carbon grown on the silicon oxide particles, and a carbon coating layer formed on surfaces of the silicon oxide particles and the fiber-type carbon, and a method of preparing the anode active material. Since the anode active material of the present invention is used in an anode of a lithium secondary battery, conductivity may not only be improved but the physical bonding force between the silicon oxide particles and the fiber-type carbon may also be increased. Thus, the performance of the battery may be improved by addressing limitations related to the exfoliation of the fiber-type carbon which may occur due to the volume change of silicon oxide.

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Daejeon, South Korea

Hyun Chul Kim