Lg Chem, Ltd

Other

Jong-Hee Kim

In-Jung Kim

Hyung-Kyu Lim

In-Seok Yang

Seok-Jung Park

Chong-Oh Kim

Yuqiang Huang

Sang-Im Park

Disclosed is a cathode for a lithium secondary battery and a lithium secondary battery comprising the same. The cathode may include a current collector, a first composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the current collector, and a second composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the first composite layer. A specific surface area of the olivine-type lithium iron phosphate cathode active material powder in the second composite layer may be at least 1.2 times larger than that of the olivine-type lithium iron phosphate cathode active material powder in the first composite layer. The cathode for a lithium secondary battery has excellent safety, high energy density, and high output performance.

Cathode for lithium secondary battery and lithium secondary battery comprising the same

Disclosed is a cathode for a lithium secondary battery and a lithium secondary battery comprising the same. The cathode for a lithium secondary battery may include a current collector, a first composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the current collector, and a second composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the first composite layer. A specific surface area of the olivine-type lithium iron phosphate cathode active material powder in the second composite layer may be 0.8 times or less that of the olivine-type lithium iron phosphate cathode active material powder in the first composite layer. The cathode for a lithium secondary battery has excellent stability, high energy density, and improved cycle life characteristics.

An apparatus for enhancing impregnation of the electrolyte in a secondary battery includes a tray in which at least one battery cell is received, and an oscillation and rotation unit capable of oscillating and rotating the tray simultaneously.

Apparatus and method for enhancing impregnation with electrolyte in secondary battery

The present invention relates to radioactive magnetic fluids, process for preparing them and use thereof. Particularly, the present invention relates to the radioactive magnetic fluids for treatment or diagnosis of cancer, process for preparing them and use thereof. The radioactive magnetic fluids of the present invention include the component of Cuwhich radiates a &#x3b2;-ray and &#x3b3;-ray. The &#x3b2; radiation can effectively kill the tumor cells. Since the &#x3b3; radiation are easily imaged with &#x3b3;-camera, the magnetic fluids can be gathered to the treatment site with the radiograph under external magnetic field. Therefore, the radioactive magnetic fluids of the present invention can be used for treatment of cancer with minimal side effects. Also, the tightly bonded decanoic acid and nonanoic acid layer of the present invention not only increase particle-particle repulsion but also take hydrophilicity, to disperse homogeneously and stably the magnetic nanoparticles in water. Also, carboxylic acid of the surfactant is exposed to outside, to prevent the magnetic nanoparticles from being oxidized by air. Therefore, the radioactive magnetic fluids can be used as therapeutic drug or diagnostic reagent for cancer.

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Daejeon, South Korea

Jong-Hee Kim