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

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• 作者：Huanwen Wang ; Yu Zhang ; Huixiang Ang ; Yongqi Zhang ; Hui Teng Tan ; Yufei Zhang ; Yuanyuan Guo ; Joseph B. Franklin ; Xing Long Wu ; Madhavi Srinivasan ; Hong Jin Fan and Qingyu Yan
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：26
• 期：18
• 页码：3082-3093
• 全文大小：3825K
• ISSN：1616-3028

文摘

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.