期刊
IONICS
卷 22, 期 9, 页码 1719-1728出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-016-1683-4
关键词
Li2MnSiO4; Asymmetric supercapacitor; Aqueous electrolyte; Nanocrystalline
资金
- Council of Scientific and Industrial Research (CSIR), Government of India [22 (0658)/14/EMR-II]
- Ministry of Human Resource Development (MHRD), India
Novel asymmetric supercapacitor (ASC) composed of nanocrystalline Li2MnSiO4 (LMS) and activated carbon (AC) in aqueous electrolyte is investigated. ASC is tested in three different electrolytes, viz. 2 M KOH, 2 M LiOH, and 2MLi(2)SO(4). The aqueous solution of 2 M KOH is found to be an appropriate electrolyte in terms of better capacitance, cyclability, and rate capability probably due to a smaller hydration sphere radius and larger ionic conductivity of K+ ions. The electrochemical performance of ASC is examined using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) cycling, and results are complimented with electrochemical impedance spectroscopy (EIS). Novel ASC exhibits the specific capacitance of 60 (similar to 5) F g(-1) at 3 mV s(-1) in 2 M KOH. The excellent cyclability (till 5000 cycles) is also observed. The improved supercapacitive properties are mainly ascribed to the unique morphology of LMS (surface area similar to 30 m(2) g(-1) and homogenous meso-pore distribution) which provides easy percolation of electrolytic ions to provide better formation of electric double layer with minor redox behavior. The ex situ X-ray diffraction (XRD) measurement was carried out on a cycled electrode to support the plausible reaction mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据