Abstract:
PURPOSE: A manufacturing method of a LiFePO4 positive electrode active material is provided to reduce costs and to prevent air pollution by using a positive active material that a positive electrode scrap is recycled or retreated. CONSTITUTION: A manufacturing method of a LiFePO4 positive electrode active material comprises a step of heat-treating LiFePO4 positive active material-containing positive electrode scraps (S1); a step of collecting LiFePO4 positive active material by separating a current collector from the positive electrode scraps (S2); a step of heat-treating the LiFePO4 positive active material (S3); a step of dissolving the LiFePO4 positive active material in an acid solution and precipitating FePO4 by injecting ammonia water into the solution (S4); a step of obtaining FePO4 solid contents by filtering the solution (S5); a step of obtaining crystalline FePO4 or Fe2P2O7 by heat-treating the FePO4; and a step of mixing a lithium compound and a carbon source into the FePO4 or Fe2P2O7, and heat-treating the mixture to manufacture the LiFePO4 positive active material (S7). [Reference numerals] (AA) LiFePO4 positive active material; (S1) Heat-treat LiFePO4 positive electrode scraps; (S2) Separate a current collector; (S3) Heat-treat LiFePO4 positive active material in the air; (S4) Dissolve in an acid solution and inject ammonia water into the solution -> Precipitate FePO4; (S5) Filter the precipitate; (S6) Heat-treat FePO4 precipitate in the air or hydrogen -> crystallize into FePO4 or Fe2P2O7; (S7) Mix and heat-treat a lithium compound to satisfy Li:Fe=1:1
Abstract:
본 발명은 리튬이차전지용 양극활물질 및 그 제조방법에 관한 발명이다. 본 발명에 따른 리튬이차전지용 양극활물질은 고전압에서도 높은 용량의 달성 및 최대 용량의 유지가 가능하고, 계속된 충방전에도 불구하고 리튬이차전지의 용량이 떨어지지 않는 효과가 있으며, 리튬이차전지의 수명을 보다 연장시키는 효과가 있는 리튬이차전지용 양극활물질 및 그 제조방법의 제공이 가능하다.
Abstract:
The present invention relates to a positive electrode active material for a lithium secondary battery and a preparation method thereof. The present invention provides: a positive electrode active material for a lithium secondary battery which can reach high capacity and maintain maximum capacity even in a high voltage, can prevent the decrease of the capacity of the lithium secondary battery after repetitive charging and discharging, and can extend the lifetime of the lithium secondary battery; and a preparation method thereof. [Reference numerals] (AA) Example 1; (BB) Example 2; (CC) Example 3
Abstract:
PURPOSE: A hydrogen pump system is provided to separate or purify hydrogen by an independent operation without external power source. CONSTITUTION: A hydrogen pump system includes m hydrogen pumps and n fuel cells. A first hydrogen pump includes a first electrode-membrane assembly; a first hydrogen supply unit located in one side of the first hydrogen pump electrode-membrane assembly; a first residual gas exhaust unit; and a hydrogen exhaust unit located in the opposite side of the electrode-membrane assembly. Other hydrogen pumps are similar to the first hydrogen pump. [Reference numerals] (AA) Mixed gas; (BB) Concentration; (CC) Hydrogen pump; (DD) Air
Abstract:
고체 산 촉매와 이온성 액체를 사용하여 셀룰로오스를 가수분해하는 방법이 개시된다. 상기 가수분해 방법은 셀룰로오스의 가수분해 반응의 효율을 향상시켜 높은 수율의 글루코오스 생성이 가능하다. 이온성 액체, 고체 산 촉매, 셀룰로오스, 가수분해, 글루코오스
Abstract:
PURPOSE: A method for hydrolyzing cellulose using solid acid catalyst and ionic liquid is provided to improve hydrolysis efficiency of cellulose using solid acid catalyst and ionic liquid, thereby obtaining glucose at high yield. CONSTITUTION: A method for hydrolyzing cellulose is characterized by using solid acid catalyst and ionic liquid and pre-treating cellulose with ionic liquid before hydrolysis. The solid acid catalyst is selected from the group consisting of zeolite, silica-alumina, cation exchange resin, sulfuric acid-supported metal oxide, and heteropoly acid.
Abstract:
본 발명은 이온성 액체를 이용하여 처리된 셀룰로오스를 고체 산 촉매에 의하여 가수분해하는 방법에 관한 것으로, 보다 상세하게 바이오매스의 구성성분인 셀룰로오스가 가지는 강한 수소결합을 이온성 액체 전처리에 의하여 분해되기 쉬운 형태로 전환시킨 후 고체 산 촉매인 제올라이트에 의하여 가수분해시켜 글루코오스를 제조하는 방법에 관한 것이다. 바이오매스, 셀룰로오스, 이온성 액체, 전처리, 고체 산 촉매, 제올라이트, 가수분해, 글루코오스, 셀로비오스