METHOD OF PREPARING CARBON NANOTUBE-OLIVINE TYPE LITHIUM MANGANESE PHOSPHATE COMPOSITES AND LITHIUM SECONDARY BATTERY USING THE SAME

• Main Authors: YOON, DONG MYUNG, BANG, SUNG ROK, SHIM, HYUNG CHEOUL
• Format: Patent
• Language: English; Korean
• Published: 02.10.2013
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

PURPOSE: A manufacturing method of a carbon nanotube-olivine type lithium manganese phosphorous oxide composite provides phosphorous oxide composite capable of improving the energy density and the output performance of a secondary battery by facilitating the electron movement between positive active materials. CONSTITUTION: A manufacturing method of a carbon nanotube-olivine type lithium manganese phosphorous oxide composite comprises a step of acid-treating the carbon nanotubes by adding acid solution; a step of forming a precursor mixture by mixing the carbon nanotubes and the metal precursor of an olivine type lithium manganese phosphate; and a step of heat-treating the precursor mixture. The olivine type lithium manganese phosphate is represented by chemical formula 1: LiMn_(1-x)M_xPO_4. In the chemical formula 1, M is one or more selected from Ni, Fe, Zr, Co, Mg, Mo, Al, Ag, Y, and Nb; and x is 0<=x <1. [Reference numerals] (AA) Example 1; (BB) Comparative example 1; (CC) Comparative example 2; (DD) Comparative example 3