CAJ | 학술논문

橄榄石结构的LiFePO_4以其高比容量、低成本、环境友好、热稳定性良好等优点而成为一类最具发展前景的锂离子电池正极材料,但电导率和离子扩散率低是制约其在动力电池领域广泛应用的主要障碍.从材料制备和改性等方面综述了近年来国内外利用液相法合成LiFePO_4以及掺杂改性的研究状况,比较了水热法、共沉淀法、溶胶-凝胶法及掺杂对材料性能的影响,认为合成材料的形貌和粒径以及导电剂或少量金属离子的掺杂是提高LiFePO_4电导率的有效方法,指出今后的重点方向是合成工艺的改进和理论的继续深入研究.
감람석결구적LiFePO_4이기고비용량、저성본、배경우호、열은정성량호등우점이성위일류최구발전전경적리리자전지정겁재료,단전도솔화리자확산솔저시제약기재동력전지영역엄범응용적주요장애.종재료제비화개성등방면종술료근년래국내외이용액상법합성LiFePO_4이급참잡개성적연구상황,비교료수열법、공침정법、용효-응효법급참잡대재료성능적영향,인위합성재료적형모화립경이급도전제혹소량금속리자적참잡시제고LiFePO_4전도솔적유효방법,지출금후적중점방향시합성공예적개진화이론적계속심입연구.
The olivine LiFePO_4 is viewed widely as the most promising cathode material for lithium ion battery due to its high specific capacity, lower cost,environmental benignancy,good thermal stability,etc. Exploring new synthesis methods which can reduce energy consumption and cost, and improve electrochemical performance of LiFePO_4 through modification have become research hotspots nowadays. Compared with solid-state synthetic methods, wetchemical approaches have attracted more and more attention because of their simple procedure, low consumption,small particle size of product,and uniform particle size distribution. In this paper,the researches of recent years for the synthesis of LiFePO_4 are reviewed systematically; furthermore, the modification by addition conductive materials and metal ions doping is also introduced.