A High‐Energy Lithium‐Ion Capacitor by Integration of a 3D Interconnected Titanium Carbide Nanoparticle Chain Anode with a Pyridine‐Derived Porous Nitrogen‐Doped Carbon Cathode. (3rd March 2016)

• Record Type: Journal Article
• Authors: Wang, Huanwen; Zhang, Yu; Ang, Huixiang; Zhang, Yongqi; Tan, Hui Teng; Zhang, Yufei; Guo, Yuanyuan; Franklin, Joseph B.; Wu, Xing Long; Srinivasan, Madhavi; Fan, Hong Jin; Yan, Qingyu
• Is Part Of: Advanced functional materials. Volume 26:Number 18(2016)
• Page Start: 3082
• Page End: 3093
• Publication Date: 2016-03-03
• Subjects: interconnected nanoparticle chains -- lithium‐ion capacitor -- pseudocapacitive -- pyridine -- titanium carbide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201505240
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : Lithium‐ion capacitors (LICs) are hybrid energy storage devices that have the potential to bridge the gap between conventional high‐energy lithium‐ion batteries and high‐power capacitors by combining their complementary features. The challenge for LICs has been to improve the energy storage at high charge−discharge rates by circumventing the discrepancy in kinetics between the intercalation anode and capacitive cathode. In this article, the rational design of new nanostructured LIC electrodes that both exhibit a dominating capacitive mechanism (both double layer and pseudocapacitive) with a diminished intercalation process, is reported. Specifically, the electrodes are a 3D interconnected TiC nanoparticle chain anode, synthesized by carbothermal conversion of graphene/TiO2 hybrid aerogels, and a pyridine‐derived hierarchical porous nitrogen‐doped carbon (PHPNC) cathode. Electrochemical properties of both electrodes are thoroughly characterized which demonstrate their outstanding high‐rate capabilities. The fully assembled PHPNC//TiC LIC device delivers an energy density of 101.5 Wh kg −1 and a power density of 67.5 kW kg −1 (achieved at 23.4 Wh kg −1 ), and a reasonably good cycle stability (≈82% retention after 5000 cycles) within the voltage range of 0.0−4.5 V. Abstract : A hybrid Li‐ion capacitor is developed using a pyridine‐derived porous nitrogen‐doped carbon cathode, 3D interconnected titanium carbide nanoparticle chains as the anode, and LiPF6 as electrolyte. The demonstrated high energy and power densities of such a hybrid device can bridge the gap between Li‐ion batteries and EDLCs.