Improving the performance of lithium ion capacitor by stabilizing anode working potential using CoSe2 nanoparticles embedded nitrogen-doped hard carbon microspheres
Improving the performance of lithium ion capacitor by stabilizing anode working potential using CoSe2 nanoparticles embedded nitrogen-doped hard carbon microspheres
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利用嵌入氮掺杂硬碳微球的 CoSe2 纳米颗粒稳定阳极工作电位来提高锂离子电容器的性能
DOI：
10.1016/j.electacta.2021.137717
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发表时间：
2021-02
影响因子：
6.6
通讯作者：
Gao Xiuli
中科院分区：
文献类型：
--
作者：
Li Bin;Hu Haoyu;Hu Han;Huang Congcong;Kong Dongqing;Li Yanpeng;Xue Qingzhong;Yan Zifeng;Xing Wei;Gao Xiuli
锂离子电容器（LIC）存在电池型正极和电容型负极电化学动力学不平衡、硬碳负极工作电位在充放电过程中变化较大等问题，限制了LIC电化学性能的提高。为了解决这些问题，合成了CoSe 2纳米颗粒嵌入掺氮硬碳微球（NCS-CoSe 2），并将其用作LIC的阳极材料。电化学测试表明，NCS-CoSe 2在1 A g−1电流密度下的可逆比容量高达500 mAh g− 1，可有效稳定阳极工作电位。在2.2-4.5 V的高工作电压窗口下，NCS-CoSe 2阳极的电位变化低至0.35 V，明显小于纯硬碳的电位变化（0.87 V）。在电极动力学方面，NCS-CoSe 2阳极与活性炭阴极匹配良好。当功率密度从335 W kg− 1急剧上升到6700 W kg−1时，NCS-CoSe 2//AC LIC的能量密度可达到82 Wh kg−1（初始能量密度的56.9%）。
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, CoSe2nanoparticles embedded nitrogen-doped hard carbon microspheres (NCS-CoSe2) are synthesized and used as the anode material of LIC. Electrochemical tests show that NCS-CoSe2has a reversible specific capacity of as high as 500 mAh g−1at 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-CoSe2anode 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-CoSe2anode is matched with the active carbon cathode well. When the power density rises sharply from 335 W kg−1to 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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