Electrochemical performance of LiNi0.5Mn1.5O4 prepared by improved solid state method as cathode in hybrid supercapacitor
Electrochemical performance of LiNi0.5Mn1.5O4 prepared by improved solid state method as cathode in hybrid supercapacitor
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DOI：
10.1016/j.matchemphys.2009.04.028
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发表时间：
2009-08
影响因子：
4.6
通讯作者：
Huimin Wu;C. V. Rao;B. Rambabu
中科院分区：
文献类型：
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作者：
Huimin Wu;C. V. Rao;B. Rambabu
研究了以活性炭（AC）为阳极、锂离子插层化合物LiNi 0. 5 Mn 1. 5 O 4为阴极的混合型非对称超级电容器的电化学性能。以金属醋酸盐前驱体为原料，采用固相反应法在低温下合成了纯的LiNi 0. 5 Mn 1. 5 O 4。介绍了低温短时间内前驱体对材料形成的作用。XRD证实了立方尖晶石结构（空间群Fd 3 m），SEM显示颗粒尺寸在1μm左右。研究了改进的固相反应路线对材料结构和电化学性能的影响。在非水电解液1.0M LiPF 6/EC-DMC中制备的AC/LiNi0.5Mn1.5O4混合超级电容器表现出从1.0到3.0V的倾斜电压分布，并提供约1.0 V的比能量。56Whkg−1。此外，它具有优异的循环性能，在1000次循环中容量损失小于5%。
The electrochemical performance of a hybrid asymmetric supercapacitor with activated carbon (AC) as anode and a lithium-ion intercalated compound LiNi0.5Mn1.5O4as cathode was studied. By using metal acetate precursors as starting materials in solid state reaction method, pure LiNi0.5Mn1.5O4was formed at low temperature. The role of precursors on the formation of material at low temperature and short period of time is presented. XRD confirms the cubic spinel structure (space group, Fd3m) and SEM shows the particles of size around 1μm. The effect of the modified solid state reaction route on the structural and electrochemical properties was investigated. The fabricated hybrid supercapacitor, AC/LiNi0.5Mn1.5O4in a non-aqueous electrolyte 1.0M LiPF6/EC-DMC exhibits a sloping voltage profile from 1.0 to 3.0V and delivers a specific energy of ca. 56Whkg−1. Moreover, it exhibits excellent cycling performance with less than 5% capacity loss over 1000 cycles.