Li Zhao, Cao Liujun, Chen Wei, Huang Zechuan, Liu Hao
Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology of CAEP, Chengdu, 610207, China.
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, China.
Small. 2019 Apr;15(15):e1805173. doi: 10.1002/smll.201805173. Epub 2019 Mar 12.
Li-ion capacitors (LICs) have demonstrated great potential for bridging the gap between lithium-ion batteries and supercapacitors in electrochemical energy storage area. The main challenge for current LICs (contain a battery-type anode as well as a capacitor-type cathode) lies in circumventing the mismatched electrode kinetics and cycle degradation. Herein, a mesh-like nitrogen (N)-doped carbon nanosheets with multiscale pore structure is adopted as both cathode and anode for a dual-carbon type of symmetric LICs to alleviate the above mentioned problems via a facile and green synthesis approach. With rational design, this dual-carbon LICs exhibits a broad high working voltage window (0-4.5 V), an ultrahigh energy density of ( ), the highest power density of ( ) even under an ultrahigh energy density of ( ), as well as reasonably good cycling stability with capacity retention of 84.5% (only 0.0016% capacity loss per cycle) within 10 000 cycles under a high current density of 5 A g . This study provides an efficient method and option for the development of high performance LIC devices.
锂离子电容器(LICs)在电化学储能领域展现出了填补锂离子电池和超级电容器之间差距的巨大潜力。当前的LICs(包含电池型阳极和电容器型阴极)面临的主要挑战在于克服不匹配的电极动力学和循环性能退化问题。在此,采用具有多尺度孔隙结构的网状氮(N)掺杂碳纳米片作为双碳型对称LICs的阴极和阳极,通过简便且绿色的合成方法来缓解上述问题。经过合理设计,这种双碳LICs展现出宽的高工作电压窗口(0 - 4.5 V)、超高的能量密度( )、即使在超高能量密度( )下仍具有最高的功率密度( ),以及在5 A g的高电流密度下10000次循环内具有良好的循环稳定性,容量保持率为84.5%(每循环仅0.0016%的容量损失)。该研究为高性能LIC器件的开发提供了一种有效的方法和选择。