Samsung Sdi Co., Inc.

Ming-Zi Hong

Kihyun Kim

Hyun Joon Kim

Do-Hyung Park

Ki-Hyun Kim

Han-Eol Park

Joong-Ho Moon

Kyoung-Hyun Kim

Ji-Hyun Kim

Jae-Ho Lee

Ho-Jin Kweon

Min-Han Kim

Seon-Young Kwon

Dong-Hyun Kim

Yu-Mi Song

Woong-Ho Cho

Hyun Jung Kim

Dong-Rak Kim

Sang-Hoon Kim

Dong-Jin Kim

Jong-Seo Choi

Hyun Sook Kim

Ju-Yong Kim

Jun-Won Suh

Ji-hyun Kim

Man-Seok Han

Eun-Suk Cho

Sun-Ho Kang

Myong-A Woo

Ju-Hyeong Han

Jeong-Hoon Kim

Jung-Min Han

Jeon-Jin Choi

Gyu-Ran Jeon

Jungmin Han

Jin-Hong An

Jaeho Lee

Ria Ju

Yasuki Yoshida

Hyun Kim

Yoshida Yasuki

Provided are a cathode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same. The cathode active material for a lithium secondary battery comprises: a lithium metal compound; and a lithium compound disposed on the surface of the lithium metal compound, wherein the content of lithium contained in the lithium compound is 0.25 parts by weight or less with respect to 100 parts by weight of the lithium metal compound, wherein the specific surface area of the lithium compound is between 0.5 m/g and 2.0 m/g, and the pH of the lithium compound is between 11.5 and 12.3.

Cathode active material for lithium secondary battery, method for preparing same, and lithium secondary battery comprising same

A positive active material for a rechargeable lithium battery including a lithium metal compound and a phosphorus (P)-containing compound on the surface of the lithium metal compound. A content of phosphorus (P) of the phosphorus-containing compound is about 0.1 atom % to about 10 atom % based on the total amount of elements on the surface of the positive active material. A method of preparing the same and rechargeable lithium battery including the same are also provided.

Positive active material for rechargeable lithium battery and rechargeable lithium battery including same

A positive active material for a rechargeable lithium battery including a core including at least one selected from a nickel-based composite oxide represented by Chemical Formula 1 or a lithium manganese oxide represented by Chemical Formula 2; and a coating layer on a surface of the core and including a lithium metal oxide represented by Chemical Formula 3, the positive active material having a peak at a 2&#x3b8; value of about 19&#xb0; to about 22&#xb0; and another peak at a 2&#x3b8; value of about 40&#xb0; to about 45&#xb0; in an X-ray diffraction pattern using a CuK&#x3b1; ray, is disclosed. A method of preparing the same, and a rechargeable lithium battery including the same, are also disclosed.LiNiCoMnO&#x2003;&#x2003;Chemical Formula 1LiMnO&#x2003;&#x2003;Chemical Formula 2LiMO&#x2003;&#x2003;Chemical Formula 3 In Chemical Formulae 1 to 3, x, y, a, b, c, and M are the same as in the detailed description.

Positive active material for rechargeable lithium battery, method of preparing same, and rechargeable lithium battery including the same

Positive active material for rechargeable lithium battery, method of preparing same and rechargeable lithium battery including same

A composite cathode active material includes a material capable of intercalating or deintercalating lithium; and a solid ion conductor. A cathode and a lithium battery each include the composite cathode active material. A method of preparing a composite cathode active material includes: mixing a core including a cathode active material and a solid ion conductor; and forming a coating layer including the solid ion conductor on the core utilizing a dry method.

Composite cathode active material, method of preparing the same, and cathode and lithium battery including the composite cathode active material

A composite cathode active material includes: a core including a material capable of intercalation and deintercalation of lithium; and a first coating layer on at least one portion of the core, where the first coating layer includes zirconium oxide. A lithium battery includes a cathode including the composite cathode active material. Methods of preparing the composite cathode active material are also disclosed.

Composite cathode active material, lithium battery including the same, and method of preparing the same

A composite cathode active material including a core comprising a lithium compound, and a coating layer formed on at least one portion of the core and including at least two oxide phases having different structures, a cathode and a lithium battery including the same, and a method of preparing the composite cathode active material.

Composite cathode active material, cathode and lithium battery comprising the same, and preparation method thereof

A positive active material for a rechargeable lithium battery includes a lithium composite metal oxide represented by Chemical Formula 1. A method of preparing the positive active material includes adding a lithium metal oxide represented by Chemical Formula 2 to a Zr salt-containing solution to obtain a mixed solution, drying the mixed solution to obtain a dried product, and heat-treating the dried product to prepare a lithium composite metal oxide represented by Chemical Formula 1. A rechargeable lithium battery includes a positive electrode including the positive active material.LiZrNiCoMZrO&#x2003;&#x2003;[Chemical Formula 1]

Positive active material for rechargeable lithium battery, method of preparing the same, and rechargeable lithium battery including the same

In one aspect, a composite cathode active material including at least one large-diameter active material, and at least one small-diameter active material, a cathode including the composite cathode active material and a lithium battery including the cathode is provided.

Composite cathode active material, and cathode and lithium battery each using the same

A rechargeable battery includes: a case; a first electrode assembly accommodated in the case; and second and third electrode assemblies accommodated in the case at positions adjacent to the case with the first electrode assembly being disposed therebetween. The second and third electrode assemblies have thicknesses different from that of the first electrode assembly.

Rechargeable battery

A fuel cell system including a fuel cell stack having a plurality of unit cells is provided. A method of driving the fuel cell stack is also provided. The method may include supplying a fuel to a fuel cell stack, supplying an oxidizer to the fuel cell stack, controlling supply of the fuel and the oxidizer to operate the fuel cell stack, calculating a total operation time of the fuel cell, and/or varying a stack activation period in which the oxidizer is blocked to the fuel cell stack according to the total operation time and a stack activation cycle of which the stack activation period is generated.

Fuel cell system and driving method for the same

A method of driving a fuel cell system is disclosed. The method of driving the fuel cell system may include supplying water to a reformer by pressing a pump pipe to pressing members to move the pressing members in a first direction, stopping power generation including stopping a supply of fuel and oxidant to the reformer, and discharging water in the reformer by moving the pressing members in a second direction opposite to the first direction while pressing the pump pipe with the pressing members. A fuel cell system is also disclosed. The fuel cell system includes a reformer, a fuel cell stack and a water transferring pump. The water transferring pump includes pressing members and a pump pipe. The pump pipe is in fluid communication with a water transferring pipe.

Fuel cell system and driving method of the same

A fuel cell system includes a fuel cell stack, an oxidizer supply unit, a reformer, a fuel tank, and a water tank. The reformer generates a hydrogen-containing reformed gas reformed from hydrocarbon-based fuel and supplies it to the fuel cell stack. The fuel tank supplies the hydrocarbon-based fuel to the reformer. The water tank supplies water to the reformer. The reformer includes a reforming unit configured to have a reforming reaction generated therein, a combustion unit configured to supply heat energy to the reforming unit, and a carbon monoxide reduction unit configured to reduce the concentration of carbon monoxide in a reformed gas discharged from the reforming unit. A combustion gas pipe is connected to the combustion unit. A reformed gas pipe is disposed between the reforming unit and the carbon monoxide reduction unit. At least one of the combustion gas pipe and the reformed gas pipe is configured to pass through the inside of the water tank or to raise a temperature of the water tank through contact with the water tank, thereby preventing the freezing of the water tank.

Fuel cell system having a reformer

A fuel cell system and a control method thereof are capable of preventing anode flooding due to a temperature difference between a stack and reformate upon starting a fuel cell system. The method of controlling a fuel cell system including steps of detecting a temperature of a fuel cell stack, detecting a temperature of reformate that is generated in a fuel reformer and then is supplied to the fuel cell stack through a heat exchanger, and setting the temperature of the reformate to be lower than the temperature of the fuel cell stack during a starting time of the fuel cell system.

Fuel cell system and method of controlling the same

The present embodiments relate to a fuel cell system having a cartridge stored with liquid fuel and a method of computing a fuel level remained in the cartridge. A fuel cell system of the present embodiments includes: a fuel cartridge for storing fuel; a fuel cell stack for generating power by means of the electrochemical reaction of fuel and oxygen; a fuel pump for sucking fuel stored in the fuel cartridge; a pressure sensor positioned in a fuel channel between a coupling unit of the fuel cartridge and the fuel pump; and a fuel level computing unit for computing a time point when the fuel in the fuel cartridge is almost exhausted. With the present embodiments, the fuel exhaustion in the cartridge can previously sensed at a low cost so that the damage of MEA in the fuel cell can be prevented and the inconvenience or the unexpected damage to a user can be prevented.

Fuel cell system and method of computing fuel level

Growing community of inventors

Yongin-si, South Korea

Ming-Zi Hong