최근 전기차 및 전력저장 시스템과 같은 대형 전지 시장의 성장으로 인해 리튬 이온 배터리에 대한 수요가 급증하 고 있다. 이에 따라 폐전지의 발생이 빠르게 증가할 것 으로 예상되며, 이에 대한 처리가 사회적 문제가 될 것 으로 예상된다. 폐전지 처리의 가장 효과적인 방법은 폐전지의 소재를 재활용하는 방법이다. 이 중 고가의 금속 물질로서, 재활용 시 경제성이 가장 높은 양극 소재 재활용 연구가 가장 활발히 이뤄지고 있다. 하지만 폐전지로부터 회수된 블 랙 파우더에는 도전재 및 바인더가 포함되어 있는데 양극 소재를 재활용하기 위해서는 이를 제거하는 공정이 필요하 다. 본 연구에서는 폐전지에서 추출된 폐양극 소재의 재활용을 위한 소재 전처리 연구를 제시한다. 열처리 및 화학 처리의 두 가지 전처리 공정을 사용하여 불순물을 제거하였고, 이에 따른 제거 정도를 SEM 분석을 통해 확인하였고, 불순물의 정량 분석을 TGA, EA 분석을 통해 확인하였으며, 전기화학 성능을 분석하였다.

Lithium-ion battery (LiB) is one of the special issues on nowadays and diverse researches to develop LiB with better performances have been carried out so far, especially, regarding improved properties of each component such as cathode, anode, separator and electrolyte. However, there are limited information on ‘processing’ to prepare each component, and especially fabrication of cathode is strongly dependent on thinky mixer to realize homogeneous dispersion of active materials and conductors in binders. Herein, we report on preparation of LiNi0.8Co0.1Mn0.1O2 (NCM811) based cathode materials with different carbon conductors (CNT and carbon black) using homogenizer and three-roll milling method. These processes are turned out perfect alternative to prepare cathode electrode. LiB cells were assembled using the dispersed electrode slurry and the performance of a cell was electrochemically stable, even in the case of a CNT conductor, which is normally difficult to make perfect dispersion because of its strong Van der Waals attraction between the tubes and π–π interactions.

In the development of Molten Carbonate Fuel Cell, one of the serious problems is the dissolution of cathode material. Therefore, the development of the alternative cathode which is stable in molten carbonate is needed. In this research, the LiCoO2 was chosen as alternative cathode material. LiCoO2 powder was synthesized by high temperature calcination method and by citrate sol-gel method. And its structure and physical characteristics were analyzed by XRD, IR TGA and porosimeter. The conductivity and solubility of LiCoO2 electrode were also measured Homogeneous LiCoO2 powder was obtained by citrate sol-gel method at 445℃, however, obtained above 750℃ by high temperature calcination method. Homogeneous particle size distribution and fine powder were obtained by the citrate sol-gel method. LiCoO2 electrode showed higher electric conductivity (1.7 Ω^-1 ㎝^1) than NiO (0.1 Ω^-1 ㎝^-1) at 650℃. The solubilities of LiCoO2 electrode in electrolyte were varies 0.6 to 1.0 ppm during 200 hours. So, the solubilities of LiCoO2 were much lower than that of NiO.