Xu Yong, Chen Jun, Xiao Ze'en, Ou Caixia, Lv Weixia, Tao Lihong, Zhong Shengwen
School of Materials Science and Engineering, Jiangxi Key Laboratory of Power Batteries and Materials, Jiangxi University of Sciences and Technology, Ganzhou 341000, China.
Nanoscale. 2019 Aug 29;11(34):15881-15891. doi: 10.1039/c9nr06186j.
A porous composite electrode composed of diatomite-mixed 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) is prepared by electrostatic spinning technology. Compared with traditional coated electrodes without diatomite mixing, the obtained composite electrode materials have higher porosity, larger specific surface area and faster lithium ion transport channels, which makes them exhibit better electrochemical performance, such as smaller impedance, higher capacity, and better cycling stability and rate performance. The electrospun diatomite-mixed 1,4,5,8-NTCDA composite (ED-1,4,5,8-NTCDA) electrode shows an initial coulombic efficiency of 77.2%, which is much higher than that of the electrospun 1,4,5,8-NTCA (E-1,4,5,8-NTCDA) electrode without diatomite mixing (63.8%) and the coated 1,4,5,8-NTCA (C-1,4,5,8-NTCDA) electrode (48.3%). Moreover, the ED-1,4,5,8-NTCDA electrode displays an initial discharge capacity of 1106.5 mA h g-1, which is much higher than that of the E-1,4,5,8-NTCDA electrode (546.0 mA h g-1) and the C-1,4,5,8-NTCDA electrode (185.4 mA h g-1). After 200 cycles, the capacity of the ED-1,4,5,8-NTCDA electrode remains at 1008.5 mA h g-1 with a retention ratio of 91.2%, which is also much higher than that of 753.2 mA h g-1 for the E-1,4,5,8-NTCDA electrode and 288.1 mA h g-1 for the C-1,4,5,8-NTCDA electrode. Even at a higher current density of 1500 mA g-1, its capacity remains above 508.9 mA h g-1. The ED-1,4,5,8-NTCDA electrode presents superior performance, which opens up a promising new approach for further utilization of organic materials as electrode materials in rechargeable lithium-ion batteries.
采用静电纺丝技术制备了一种由硅藻土与1,4,5,8 - 萘四甲酸二酐（NTCDA）混合而成的多孔复合电极。与未混合硅藻土的传统涂层电极相比，所制备的复合电极材料具有更高的孔隙率、更大的比表面积和更快的锂离子传输通道，这使得它们表现出更好的电化学性能，如更小的阻抗、更高的容量以及更好的循环稳定性和倍率性能。静电纺丝法制备的硅藻土 - 1,4,5,8 - NTCDA复合电极（ED - 1,4,5,8 - NTCDA）的首次库仑效率为77.2%，远高于未混合硅藻土的静电纺丝1,4,5,8 - NTCA电极（E - 1,4,5,8 - NTCDA，63.8%）和涂层1,4,5,8 - NTCA电极（C - 1,4,5,8 - NTCDA，48.3%）。此外，ED - 1,4,5,8 - NTCDA电极的首次放电容量为1106.5 mA h g⁻¹，远高于E - 1,4,5,8 - NTCDA电极（546.0 mA h g⁻¹）和C - 1,4,5,8 - NTCDA电极（185.4 mA h g⁻¹）。经过200次循环后，ED - 1,4,5,8 - NTCDA电极的容量保持在1008.5 mA h g⁻¹，保持率为91.2%，这也远高于E - 1,4,5,8 - NTCDA电极的753.2 mA h g⁻¹和C - 1,4,5,8 - NTCDA电极的288.1 mA h g⁻¹。即使在1500 mA g⁻¹的更高电流密度下，其容量仍保持在508.9 mA h g⁻¹以上。ED - 1,4,5,8 - NTCDA电极表现出优异的性能，为将有机材料进一步用作可充电锂离子电池的电极材料开辟了一条有前景的新途径。
