High and ultra-stable energy storage from all-carbon sodium-ion capacitor with 3D framework carbon as cathode and carbon nanosheet as anode

• 作者: Fangyuan Hu Siyang Liu Shengming Li Cheng Liu Guipeng Yu Ce Song Wenlong Shao Tianpeng Zhang Xigao Jian
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（4）
• 页码范围: 304-312
• 页数: 9页
• 语种: 英文

摘要

Sodium-ion capacitors(SICs)are extremely promising due to the combined merits of high energy-power characteristics and considerable price advantage.However,it is still difficult to achieve high energy-power outputs and cycle stability in a typical configuration of the metal-based battery-type anode and activated carbon capacitor-type cathode due to the kinetic mismatching.In this work,a carbon nanosheet(PSCS-600)with large interlayer spacing of 0.41 nm derived from the bio-waste pine cone shell was pre-pared.Besides,the covalent triazine framework derived carbon(OPDN-CTF-A)was obtained through ionothermal synthesis strategy,exhibiting beneficial hierarchical pores(0.5-6 nm)and high heteroatoms(5.6 at％N,6.6 at％O).On this basis,the all-carbon SICs were fabricated by the integration of PSCS-600 anode and OPDN-CTF-A cathode.The device delivered high energy density 111 Wh kg-1,high power out-put of 14,200 W kg-1 and ultra-stable cycling life(～90.7％capacitance retention after 10,000 cycles).This work provides new ideas in fabricating carbon-carbon architectural SICs with high energy storage for practical application.