阳极
材料科学
阴极
电化学
纳米颗粒
锂(药物)
碳纤维
化学工程
电容器
电极
纳米技术
化学
复合材料
电压
电气工程
复合数
物理化学
工程类
内分泌学
医学
作者
Bin Li,Haoyu Hu,Congcong Huang,Dongqing Kong,Yanpeng Li,Qingzhong Xue,Yan Zhang,Xing Wang,Xiuli Gao
标识
DOI:10.1016/j.electacta.2021.137717
摘要
Lithium-ion capacitors (LIC) have problems such as the imbalance of electrochemical kinetics between the battery-type anode and the capacitive cathode, and the large change in the working potential of the hard carbon anode during charge and discharge, which limit the improvement of electrochemical performance for LIC. To solve these problems, CoSe2 nanoparticles embedded nitrogen-doped hard carbon microspheres (NCS-CoSe2) are synthesized and used as the anode material of LIC. Electrochemical tests show that NCS-CoSe2 has a reversible specific capacity of as high as 500 mAh g−1 at a current density of 1 A g−1, which can effectively stabilize the working potential of the anode. At a high working voltage window of 2.2–4.5 V, the potential change of the NCS-CoSe2 anode is as low as 0.35 V, significantly smaller than that of the pure hard carbon (0.87 V). Regarding the electrode kinetics, the NCS-CoSe2 anode is matched with the active carbon cathode well. When the power density rises sharply from 335 W kg−1 to 6700 W kg−1, the energy density of NCS-CoSe2//AC LIC can attain 82 Wh kg−1 (56.9% of initial energy density).
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