Nitrogen and oxygen co-doped porous carbon nanosheets as high-rate and long-lifetime anode materials for high-performance Li-ion capacitors. (October 2019)

• Record Type: Journal Article
• Authors: Liu, Mengyue; Zhang, Zhengping; Dou, Meiling; Li, Zhilin; Wang, Feng
• Is Part Of: Carbon. Volume 151(2019)
• Page Start: 28
• Page End: 35
• Publication Date: 2019-10
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.05.065
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The rational design and sustainable synthesis of high-performance electrode materials are crucial for the practical applications of Li-ion capacitors. Herein, we demonstrate a sustainable strategy for the synthesis of N and O co-doped porous carbon nanosheets via the extraction of gelatin from the fish scales by KCl aqueous solution, lyophilization, and carbonization followed by water washing. With the help of ice/KCl double templates, the resulting sample possesses porous nanosheet structure with the thickness of ca. 4 nm, numerous N and O heteroatoms (8.2 at.% for N, 8.4 at.% for O) derived from gelatin and good electric conductivity (111 S m −1 ). When used as the anode material for Li-ion storage, it shows surprising rate capability (249 mAh g −1 at 50 A g −1 ) and cycling performance (without decay in 10, 000 cycles) in half cells. Consequently, a hybrid Li-ion capacitor based on the carbon nanosheet anode delivers a high energy density (184 Wh kg −1 ), an ultrahigh power density (78.1 kW kg −1 ), and an ultralong lifetime (with energy retention of 70% after 10 000 cycles). Graphical abstract: N and O co-doped porous carbon nanosheets with high electric conductivity have been prepared by a sustainable method using low-cost fish scales as precursors. The as-prepared carbons show superior anode performance for Li-ion storage in half cells and Li-ion capacitors.Image 1