一次粒径和二次粒径对LiFePO_4性能的影响  

The Influence of Primary Particle Size and Secondary Particle Size on Performances of LiFePO_4

作　　者：郭孝东[1,2] 钟本和[1,2] 唐艳[1] 任建新[1] 胡有坤[1] 刘恒[3] 方为茂[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]教育部磷资源综合利用与清洁加工工程研究中心,四川成都610065 [3]四川大学材料科学与工程学院,四川成都610064

出　　处：《高校化学工程学报》2013年第5期884-888,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：四川大学青年基金(2011SCU11081);国家科技支撑计划(2007BAQ01055);国家自然科学基金(50574063)

摘　　要：研究了一次粒径和二次粒径对磷酸亚铁锂性能的影响。分别采用扫描电子显微镜(SEM)、激光粒度仪等分析了材料的一次粒径和二次粒径。将材料装配成扣式电池进行一系列的电化学特性测试,分析磷酸亚铁锂材料的充放电循环性能、氧化还原电位、阻抗等性能。研究发现一次粒径主要影响磷酸亚铁锂材料的放电容量、放电电位和阻抗,对材料的振实密度影响视其团聚程度而定;二次粒径对磷酸亚铁锂材料的振实密度影响很大。The influences of primary particle size and secondary size on the performance of lithium iron phosphate were studied. Scanning electron microscope （SEM） and laser particle size analyzer were employed to characterize the primary particle size and secondary size of lithium iron phosphate samples. The lithium iron phophate samples were assembled to form the button batteries for the test of the electrochemical features of the samples, such as charge-discharge cycle performance, oxidation-reduction potentials and impedance. At last, it was concluded as following： primary particle size is significant for discharge capacity, discharge potential and impedance except for tap density; the tap density dependents on secondary particle size essentially. And for a high volumetric energy density lithium iron phosphate, what requirements must be met was proposed.

关 键 词：磷酸亚铁锂 一次粒径 二次粒径 影响 

分 类 号：TM205.1[一般工业技术—材料科学与工程]