铁氰化钾/碳用作锂二次电池正极材料  

Potassium ferricyanide/carbon used as cathode material of lithium secondary battery

作　　者：周飞[1] 赵培正[1] 郑洪河[1,2] 

机构地区：[1]河南师范大学化学化工学院,河南新乡453007 [2]苏州大学能源学院,江苏苏州215006

出　　处：《电池》2013年第3期139-142,共4页Battery Bimonthly

摘　　要：用SEM、循环伏安和充放电测试对用作锂二次电池正极的铁氰化钾[K3Fe(CN)6]/碳(C)复合材料进行分析。在充放电过程中,复合材料在3.05 V/2.95 V经历液相电化学过程,在3.64 V/3.55 V经历固相电化学过程。复合材料在2.0～4.0 V充放电,0.5 C倍率时的可逆比容量为71.4 mAh/g;10.0 C倍率时的放电容量保持率为73%;2.0 C倍率循环700次的容量保持率在80%以上,容量的衰减主要发生在固态电化学过程。Performance of potassium ferricyanide [ K3 Fe （CN） 6/C ]/carbon （C） composite used as cathode of lithium secondary bat- tery was analyzed by SEM, cyclic voltammetry and charge-discharge tests. The composite underwent a liquid-phase electrochemical process at 3.05 V/2. 95 V and a solid-phase electrochemical process at 3. 64 V/3. 55 V in the charge-discharge process. When the composite was charged-discharged in 2.0 - 4. 0 V, its reversible specific capacity at 0. 5 C rate was 71.4 mAh/g, the capacity retention at 10. 0 C rate was 73%, its capacity retention was more than 80% after 700 cycles at 2.0 C rate, most of the capacity decay occurred in the solid-phase electrochemical process.

关 键 词：铁氰化钾[K3Fe(CN)6] 锂二次电池 正极 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]