Abstract: Disclosed is a positive electrode for a lithium-sulfur battery. The positive electrode includes a sulfur-carbon composite as a positive electrode active material. The sulfur-carbon composite includes a porous carbonaceous material having a high porosity and high specific surface area. Therefore, when the sulfur-carbon composite is applied to a battery, the battery shows a reduced initial irreversible capacity and improved output characteristics and life characteristics.

Abstract: Disclosed is a positive electrode for a lithium-sulfur battery, including a sulfur-carbon composite as a positive electrode active material. The sulfur-carbon composite includes a porous carbonaceous material having a high specific surface area, and the total pore volume in the carbonaceous material and a volume of pores having a specific diameter are controlled to specific ranges. Also disclosed is a lithium-sulfur battery using the sulfur-carbon composite. The lithium-sulfur battery shows reduced initial irreversible capacity and improved output characteristics and life characteristics.

Abstract: An embodiment hammer device includes a driver, an upper body configured to move in a direction set by power generated from the driver, an elastic body provided on the upper body, a hammer provided in the elastic body, a force sensor provided in the hammer, and a support configured to support the elastic body and the hammer.

Abstract: A positive electrode for a lithium-sulfur battery is provided. The positive electrode includes a positive electrode active material comprising a first and second sulfur-carbon composites respectively comprising a first and a second carbonaceous materials having a different specific surface area and pore volume from each other, and provides reduced initial irreversible capacity and improved output characteristics and life characteristics of a secondary battery.

Abstract: A method for preparing a sulfur-carbon composite including a step of pretreating a carbon material is provided. The method is capable of removing water and other impurities from the carbon material effectively, and the sulfur-carbon composite obtained by the method used as a positive electrode active material of a lithium-sulfur battery provides improved sulfur supportability and over-voltage performance of the lithium-sulfur battery, reduced initial irreversible capacity of the positive electrode active material, and improved output characteristics and life characteristics.

Abstract: An embodiment hammer device includes a driver, an upper body configured to move in a direction set by power generated from the driver, an elastic body provided on the upper body, a hammer provided in the elastic body, a force sensor provided in the hammer, and a support configured to support the elastic body and the hammer.

Abstract: A planetary gear carrier pack transmission error inspection device is provided. The device includes a planetary gear carrier pack that outputs a rotation speed input to an input side through a planetary gear, a sun gear and a ring gear at a predetermined gear ratio to an output side. An input unit is arranged on an upper side of the planetary gear carrier pack to input a predetermined input rotation speed to the input side of the planetary gear carrier pack. A load unit is arranged on a lower side of the planetary gear carrier pack connected to the output side of the planetary gear carrier pack to apply a predetermined output load to the output side. In addition, an adjusting block is arranged to adjust the planetary gear carrier pack to secure the planetary gear carrier pack.

Abstract: A planetary gear carrier pack transmission error inspection device is provided. The device includes a planetary gear carrier pack that outputs a rotation speed input to an input side through a planetary gear, a sun gear and a ring gear at a predetermined gear ratio to an output side. An input unit is arranged on an upper side of the planetary gear carrier pack to input a predetermined input rotation speed to the input side of the planetary gear carrier pack. A load unit is arranged on a lower side of the planetary gear carrier pack connected to the output side of the planetary gear carrier pack to apply a predetermined output load to the output side. In addition, an adjusting block is arranged to adjust the planetary gear carrier pack to secure the planetary gear carrier pack.