Abstract:
The present invention relates to a negative electrode for a lithium battery which comprises a metallic layer containing lithium and a carbon material layer in a plate structure formed on the surface of the metallic layer, a manufacturing method of the negative electrode, and the lithium battery including the same. The carbon material layer of the negative electrode for the lithium battery has a crystalline structure. [Reference numerals] (AA) First cycle;(BB) Tenth cycle;(CC) Capacity (mAh)
Abstract:
PURPOSE: A lithium titanium oxide is provided to manufacture a high-grade lithium battery by having a high purity and crystallizing property by satisfying a specific range of full width at half maximum 1 (FWHM1)/full width at half maximum 2 (FWHM2). CONSTITUTION: A lithium titanium oxide is a spinel type, and FWHM1 /FWHM2 in the range of 5-50 kHz is less than 1.70. The FWHM1 is a full width at half maximum of 7 Li peak in the range of -10 ppm to +10 ppm among a solid state-NMR spectrum of the lithium titanium oxide. The FWHM2 is a full width at half maximum of 7 Li peak in the range of -10 ppm to +10 ppm among a solid state-NMR spectrum of the lithium chloride standard reagent (STD). The FWHM1 and the FWHM2 are measured in the identical spinning rate (kHz). The manufacturing method of the lithium titanium oxide comprises the following steps. A mixture which includes a lithium-containing precursor and a titanium-containing precursor is prepared. The lithium titanium oxide is manufactured by heat treating the mixture. The titanium-containing precursor includes a second component, and the second component includes at least one of phosphorus (P) and potassium (K).
Abstract:
PURPOSE: A negative electrode active material is provided to improve initial charging and discharging efficiency, capacity maintenance, and high voltage properties of a high capacity lithium battery by using multi-layered nanotubes. CONSTITUTION: A negative electrode active material comprises: an inner layer which comprises an inner surface of metal nanotubes, and an outer layer which comprises an outer surface of the metal nanotubes. The inner layer comprises a first metal of which an atomic number is 13 or more. The outer layer comprises multilayered metal nanotubes which comprise a second metal different with the first metal. The second metal has a lower resistivity than the resistivity of the first metal. The diffusivity of lithium ions is high and volume expansion at charging is low. [Reference numerals] (AA) Metal oxide nanorod; (BB) Conductive substrate; (CC) First metal coating; (DD) Metal oxide template etching; (EE) First metal nanotube; (FF) Second metal coating; (GG) First metal; (HH) Second metal; (II) Inner and outer layer structures
Abstract:
An electrode for a secondary battery is provided to improve the capacity of electrode and cycle of a battery by improving the uniformity of an active material layer through the printing of low point ink. An electrode for a secondary battery comprises a current collector(10) and an active material layer formed by printing and drying ink(11) having the viscosity of 500 mPa . s on the current collector. The surface roughness Ra the current collector is 0.025-1.0 micron. The thickness the active material layer is 0.1-10 micron. The current collector is surface-treated with UV or the plasma.