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Ultrahigh-energy sodium ion capacitors enabled by the enhanced intercalation pseudocapacitance of self-standing Ti2Nb2O9/CNF anodes
Nanoscale ( IF 6.7 ) Pub Date : 2021-08-25 , DOI: 10.1039/d1nr04241f Liaona She 1, 2, 3, 4 , Feng Zhang 1, 2, 3 , Congying Jia 1, 2, 3 , Liping Kang 1, 2, 3 , Qi Li 1, 2, 3 , Xuexia He 1, 2, 3 , Jie Sun 1, 2, 3 , Zhibin Lei 1, 2, 3 , Zong-Huai Liu 1, 2, 3
Nanoscale ( IF 6.7 ) Pub Date : 2021-08-25 , DOI: 10.1039/d1nr04241f Liaona She 1, 2, 3, 4 , Feng Zhang 1, 2, 3 , Congying Jia 1, 2, 3 , Liping Kang 1, 2, 3 , Qi Li 1, 2, 3 , Xuexia He 1, 2, 3 , Jie Sun 1, 2, 3 , Zhibin Lei 1, 2, 3 , Zong-Huai Liu 1, 2, 3
Affiliation
In order to increase the capacity and improve the sluggish Na+-reaction kinetics of anodes as sodium ion capacitors (SICs), a Ti2Nb2O9/CNF self-standing film electrode comprised of Ti2Nb2O9 nanosheets and carbon nanofibers has been fabricated via electrospinning HTiNbO5 nanosheets with PAN and subsequent carbonization treatment. The as-prepared Ti2Nb2O9/CNF film electrode possesses fast Na-ion intercalation kinetics and high conductivity during Na-ion storage, and it displays a high reversible capacity of 324 mA h g−1 at 0.1 A g−1. Additionally, it also delivers a superior rate capability of 204 mA h g−1 at a high current density of 4 A g−1, as well as an excellent cycling stability of 97% retention after 2000 cycles at 1 A g−1 in a half-cell test. A prototype Ti2Nb2O9/CNF//AC SIC full device was assembled by employing the presodiated Ti2Nb2O9/CNF anode and AC cathode, and it exhibits an high energy density of 129 W h kg−1 at a power density of 75 W kg−1 and a high power density (7560 W kg−1 with 63 W h kg−1), a good cycling performance of 85% capacitance retention after 10 000 cycles at 1 A g−1, suggesting that the Ti2Nb2O9/CNF electrode with excellent performance would be a very promising candidate as the anode for high-performance SICs.
中文翻译:
通过自立式 Ti2Nb2O9/CNF 阳极增强的插层赝电容实现超高能钠离子电容器
为了增大容量和提高呆滞的Na + -反应动力学阳极钠离子电容器(的SIC)的Ti 2 Nb的2 ö 9 / CNF自立膜电极由钛2的Nb 2个ö 9纳米片和碳纳米纤维是通过静电纺丝 HTiNbO 5纳米片与 PAN 和随后的碳化处理制成的。所制备的 Ti 2 Nb 2 O 9 /CNF 薄膜电极在钠离子存储过程中具有快速的钠离子嵌入动力学和高电导率,并显示出 324 mA hg 的高可逆容量-1在 0.1 A g -1。此外,它还在 4 A g -1的高电流密度下提供了 204 mA hg -1的优异倍率性能,以及在 1 A g -1的半数下2000 次循环后保持 97% 的出色循环稳定性-细胞测试。原型的Ti 2 Nb的2 ö 9 / CNF // AC SIC完整设备组装通过采用presodiated的Ti 2 Nb的2 ö 9 / CNF阳极和AC阴极,并且其表现出129 W时千克的高能量密度-1在75 W kg -1的功率密度和高功率密度(7560 W kg -163 W h kg -1 ),在 1 A g -1 10 000 次循环后具有 85% 的电容保持率的良好循环性能,表明具有优异性能的 Ti 2 Nb 2 O 9 /CNF 电极将是一个非常有前途的候选者作为高性能 SIC 的阳极。
更新日期:2021-09-16
中文翻译:
通过自立式 Ti2Nb2O9/CNF 阳极增强的插层赝电容实现超高能钠离子电容器
为了增大容量和提高呆滞的Na + -反应动力学阳极钠离子电容器(的SIC)的Ti 2 Nb的2 ö 9 / CNF自立膜电极由钛2的Nb 2个ö 9纳米片和碳纳米纤维是通过静电纺丝 HTiNbO 5纳米片与 PAN 和随后的碳化处理制成的。所制备的 Ti 2 Nb 2 O 9 /CNF 薄膜电极在钠离子存储过程中具有快速的钠离子嵌入动力学和高电导率,并显示出 324 mA hg 的高可逆容量-1在 0.1 A g -1。此外,它还在 4 A g -1的高电流密度下提供了 204 mA hg -1的优异倍率性能,以及在 1 A g -1的半数下2000 次循环后保持 97% 的出色循环稳定性-细胞测试。原型的Ti 2 Nb的2 ö 9 / CNF // AC SIC完整设备组装通过采用presodiated的Ti 2 Nb的2 ö 9 / CNF阳极和AC阴极,并且其表现出129 W时千克的高能量密度-1在75 W kg -1的功率密度和高功率密度(7560 W kg -163 W h kg -1 ),在 1 A g -1 10 000 次循环后具有 85% 的电容保持率的良好循环性能,表明具有优异性能的 Ti 2 Nb 2 O 9 /CNF 电极将是一个非常有前途的候选者作为高性能 SIC 的阳极。