Samsung Sdi Co., Inc.

Mk Electron Co., Ltd.

Seoul National University

Sejong University

Aekyung Chemical Co., Ltd.

Jaehyuk Kim

Soonsung Suh

Hana Yoo

Heeyoung Chu

Jaemyung Kim

Seunguk Kwon

Yungu Cho

Deokhyun Kim

Dukhyoung Yoon

Jongsoo Cho

Yury Matulevich

Changui Jeong

Namseon Kim

Kwangshik Choi

Heesang Jeon

Soojung Kim

Soonho Hong

Chansoon Kang

Kibuem Kim

Kyuhwan Oh

Jeongtae Kim

Chungyoo Lee

Sungwan Moon

Seungwhan Lee

Seunguh Kwon

Yohan Park

Yulsang Lee

Jongseo Choi

Soonsung Seo

Sunghwan Hong

Sunghwan Moon

Anode active materials for lithium secondary batteries are provided. According to embodiments of the present disclosure, an anode active material includes: i) a first composite including at least two active silicon materials having different crystal sizes and a silicon oxide (SiO) material (wherein 0<x≤2); ii) a second composite including an active silicon material having a crystal size of about 24 nm or greater and a silicon oxide (SiO) material (wherein 0<x≤2), mixed with a carbonaceous material; or a mixture or combination of (i) and (ii). A lithium secondary battery is provided including an anode including any one of the anode active materials.

Anode active material for lithium secondary battery and lithium secondary battery comprising anode including the anode active material

Anode active materials for lithium secondary batteries are provided. According to embodiments of the present disclosure, an anode active material includes: i) a first composite including at least two active silicon materials having different crystal sizes and a silicon oxide (SiO) material (wherein 0&#x3c;x&#x2264;2); ii) a second composite including an active silicon material having a crystal size of about 24 nm or greater and a silicon oxide (SiO) material(wherein 0&#x3c;x&#x2264;2), mixed with a carbonaceous material; or a mixture or combination of (i) and (ii). A lithium secondary battery is provided including an anode including any one of the anode active materials.

Provided are a negative active material, an anode and a lithium secondary battery including the same, and a method of preparing the negative active material. The negative active material includes a silicon alloy core including silicon, iron, and manganese, and a shell including a metal oxide on the silicon alloy core, the metal oxide including one or more of titanium, zirconium, aluminum, cobalt, or lithium. An amount of the metal oxide may be from greater than 0 wt % to less than about 12 wt % based on a total weight of the negative active material.

Negative active material having a silicon alloy core and a shell including a metal oxide, negative electrode and lithium secondary battery including the same, and method of preparing the negative active material

A negative electrode active material includes a silicon-based alloy represented by Si-M-M-C&#x2014;B, wherein Mand Mare different from each other and are each independently selected from magnesium, aluminum, titanium, vanadium, chromium, iron, cobalt, nickel, copper, zinc, gallium, germanium, manganese, yttrium, zirconium, niobium, molybdenum, silver, tin, tantalum, and tungsten. In the silicon-based alloy, Si is in a range of about 50 at % to about 90 at %, Mis in a range of about 10 at % to about 50 atom %, and Mis in a range of 0 at % to about 10 at %, based on a total number of Si, M, and Matoms. C is in a range of about 0.01 to about 30 parts by weight, and B is in a range of 0 to about 5 parts by weight, based on a total of 100 parts by weight of Si, M, and M.

Negative electrode active material and method of preparing the same

A negative active material includes a silicon-based alloy, and the silicon-based alloy includes a Si single phase, a FeSialpha phase, and a FeSibeta phase, wherein an intensity ratio of a second diffraction peak of the FeSibeta phase to a first diffraction peak of the FeSialpha phase may be 0.1 or higher. A negative electrode includes the negative active material and a lithium battery includes the negative electrode. Lifespan characteristics of the lithium battery including the negative active material may improve.

Negative active material and negative electrode and lithium battery including the material

A negative active material for a lithium secondary battery and a lithium secondary battery including the same are provided. The negative active material may be a silicon (Si)-based alloy negative active material. In some embodiments, the Si-based alloy negative active material may include Si, iron (Fe), copper (Cu), and aluminum (Al), and may have a Si single phase and a first alloy phase, the first alloy phase being represented by a formula of AlCu, where x&#x3c;y. In some embodiments, the Si-based alloy negative active material may include Si, Fe, and Cu, and may include a Si single phase, a first alloy phase, and a second alloy phase, the first alloy phase being represented by a formula of CuSi, and the second alloy phase being represented by a formula of CuFe.

Negative active material for lithium secondary battery and lithium secondary battery including the same

A negative electrode active material for a lithium secondary battery including silicon (Si), manganese (Mn), Component A including at least one selected from iron (Fe), molybdenum (Mo), chromium (Cr), zinc (Zn), titanium (Ti), nickel (Ni), vanadium (V), tungsten (W), and yttrium (Y), and Component B including at least one selected from carbon (C), boron (B), oxygen (O), nitrogen (N), phosphorous (P), and sulfur (S), wherein a total amount of Si, Mn, and Component A is about 70 atom % or less, an amount of Component B is 30 atom % or more, and a total amount of Mn and Component A is in a range of about 10 atom % to about 35 atom %.

Negative electrode active material for lithium secondary battery, and lithium secondary battery including negative electrode including the negative electrode active material

A binder composition for a lithium secondary battery, an electrode, and a lithium secondary battery, the binder composition including an interpenetrating network structure that includes a cyclic polymer, the cyclic polymer including a repeating unit represented by Formula 1 or a repeating unit represented by Formula 2; and a copolymer, the copolymer including a repeating unit represented by Formula 3 and a repeating unit represented by Formula 4, wherein an amount of the repeating unit represented by Formula 3 is about 40 mol % to about 70 mol %, based on a total amount of the copolymer: 

Binder composition for lithium secondary battery, electrode for lithium secondary battery including the binder composition, and lithium secondary battery including the electrode

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

A negative active material includes a silicon-based alloy, wherein the silicon-based alloy includes silicon (Si); a first metal (M) selected from titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), gallium (Ga), and germanium (Ge), and at least one additional element (A), which is included in the silicon-based alloy and on a surface of silicon-based alloy, selected from carbon (C), boron (B), sodium (Na), nitrogen (N), phosphorous (P), sulfur (S), and chlorine (Cl), and the silicon-based alloy has an internal porosity of about 35% or less. A lithium battery including the negative active material may have improved lifespan characteristics.

Negative active material and lithium battery including negative active material

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

Jaehyuk Kim