A high-power lithium-ion hybrid electrochemical capacitor based on citrate-derived electrodes. (20th February 2017)

• Record Type: Journal Article
• Authors: Yu, Xiaoliang; Deng, Jiaojiao; Zhan, Changzhen; Lv, Ruitao; Huang, Zheng-Hong; Kang, Feiyu
• Is Part Of: Electrochimica acta. Volume 228(2017)
• Page Start: 76
• Page End: 81
• Publication Date: 2017-02-20
• Subjects: Citrates -- Heat treatment -- Hybrid capacitor -- High power -- Cycling stability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.01.058
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Nitrogen-doped hierarchical porous carbon (N-HPC) was prepared by pyrolysis of magnesium citrate. Carbon-coated Fe2 O3 (Fe2 O3 @C) was synthesized by pyrolysis of ferric citrate. N-HPC and Fe2 O3 @C were integrated to fabricate a lithium-ion hybrid electrochemical capacitor. N-HPC//Fe2 O3 @C delivers 31 W h kg −1 at a high power density of 9.2 kW kg −1 . Abstract: Achieving high-power lithium-ion hybrid electrochemical capacitor (Li-HEC) through facile and low-cost synthesis procedures is still quite challenging. In this work, starting from daily used food additives, nitrogen-doped hierarchical porous carbon (N-HPC) was prepared through facile pyrolysis of magnesium citrate and subsequent NH3 treatment, and carbon-coated Fe2 O3 (Fe2 O3 @C) was synthesized by thermal decomposition of ferric citrate and following heat treatment in air, respectively. As-prepared N-HPC and Fe2 O3 @C were separately employed as cathode and anode materials to fabricate a high-power, which delivers a high energy density of 65 W h kg −1 at 368 W kg −1, and 31 W h kg −1 at a high power density of 9.2 kW kg −1 . And it remains 84.1% capacity over 1000 galvanostatic charge-discharge cycles at 1 A g −1 .