复合物LiFePO_4/CaB_6的结构与性能研究  

Structure and Performance of LiFePO_4/CaB_6 Composites

作　　者：刘善科[1] 董全峰[1,2] 郑明森[1] 金明钢[2] 詹亚丁[1,2] 林祖赓[1,2] 孙世刚[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系 [2]厦门大学宝龙电池研究所,厦门361005

出　　处：《高等学校化学学报》2007年第2期302-306,共5页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划(批准号:2002CB211804)资助

摘　　要：采用固相法合成了纯的LiFePO4,并通过两种不同的方法合成了不同CaB6含量的复合物LiFePO4/CaB6.对这些产物进行了粒度、形貌、电导率、振实密度、X射线衍射和充放电性能的研究.实验结果表明,CaB6的掺入虽然没有明显地提高产物的比容量,但却显著地增加了产物的振实密度和电导率.第二种方法合成的产物性能更好,其电导率提高了5个数量级,振实密度提高了65%.In order to used as a new additive improve the electric conductivity and tap density of lithium iron phosphate, CaB6 was for the first time. LiFePO4 was synthesized by solid sate reaction and LiFePO4/CaB6 composite with different contents of CaB6 was prepared by two different methods. The samples were characterized by granularity, morphology, electric conductivity, tap density, X-ray diffraction and charge-discharge performance. The results show that although the specific capacity of these materials doped with CaB6 was not improved significantly, the tap density and electronic conductivity of these composites increased. The samples synthesized by the second method exhibit much better performance, and the electronic conductivity of the materials is enhanced by five orders of magnitude and the tap density by 65%.

关 键 词：复合物LiFePO4/CAB6 电导率 振实密度 晶胞参数 比容量 

分 类 号：O646[理学—物理化学]