摘要
通过共沉淀法合成了掺杂Fe元素的锂离子电池正极材料Li[Ni_（1/3）Co_（（1-x）/3）Mn_（1/3）Fe_（x/3）]O_2（x=0、0.1、0.3、0.5、0.7和0.9）。用循环伏安、电化学阻抗谱（EIS）和恒流充放电等方法,研究铁、钴元素含量对材料电化学性能的影响。与三元材料LiNi_（1/3）Co_（1/3）Mn_（1/3）O_2相比,少量Fe掺杂（x=0.1）的Li[Ni_（1/3）Co_（0.9/3）Mn_（1/3）Fe_（0.1/3）]O_2比容量更高,循环性能更好。以0.1 C在2.4~4.5 V恒流充放电,首次、第30次循环的放电比容量分别为168.2 mAh/g、139.1 mAh/g,容量保持率为86.02%。
Li-ion battery cathode material Li [ Nil/3 Co〈1 -x）/3 Mnl/3 Fex3 ]O2 （x = 0, 0. 1, 0. 3, 0. 5, 0. 7 and 0. 9） which was doped ferrum（Fc） element were prepared by coprecipitation method. The effects of the content of Fe and Co on the dectrochemical performance of material were studied by means of cyclic voltammetry, electrochemical impedance spectroscopy （EIS） and galvanostatic charge-discharge. Compared with ternary material LiNil/3CO1/3Mn1/3O2, the LiENi1/3Co0.9/3Mnl/3Feo.l/3102 which was doped with little Fe （x = 0. 1 ） had higher specific capacity and fine cycle performance. When galvanostatie charged-discharged with O. 1 C in 2. 4 -4. 5 V, the specific discharge capacity in initial and 30th cycle was 168.2 mAh/g, 139. lmAh/g, respectively,the capacity retention rate was 86. 02%.
出处
《电池》
CAS
CSCD
北大核心
2016年第4期193-196,共4页
Battery Bimonthly
关键词
锂离子电池
正极材料
铁元素
电化学性能
Li-ion battery
cathode material
fen＇am element
electrochemical performance
