마이크로웨이브 졸-겔법에 의한 Li2MnSiO4/C 전기화학적 특성

Abstract

Abstract

Recently, The rapid proliferation of portable electronic devices in the international marketplace has led to a corresponding increase in the demand for advanced secondary batteries. The miniaturization of such devices as, for example, cellular phones, laptop computers, etc.,has induced the desire for rechargeable batteries with high specific energies. Commercialized lithium secondary batteries use cobalt based materials as a cathode material. However, cobalt based cathode materials are not suitable for large scale batteries due to high raw materials cost and safety problem. Secondary batteries will become increasingly important for future environmentally friendly “green” societies and will be use in large scale. Thus, the extensive studies to replace the currently used cobalt based cathode materials have been done and one of the possible candidates is lithium manganes silicate (Li2MnSiO4). Li2MnSiO4 has advantages of high theoretical capacities of 333 mAh/g and excellent stability. However, it suffers from very poor cycle performance and rate performance due to intrinsically low electronic conductivity. In this study, we tried to improve the electronic conductivity by means of using microwave assisted sol-gel process and in situ carbon coating using sucrose as a precursor.