Pseudocapacitance dominated Li3VO4 encapsulated in N-doped graphene via 2D nanospace confined synthesis for superior lithium ion capacitors

• Published in: Chinese chemical letters Vol. 36; no. 2; pp. 109675 - 517
• Main Authors: Yang, Caili, Long, Tao, Li, Ruotong, Wu, Chunyang, Ding, Yuan-Li
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2025; College of Materials Science and Engineering,Hunan University,Changsha 410082,China%College of Materials Science and Engineering,Hunan University,Changsha 410082,China%National Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 611731,China; National Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 611731,China
• Subjects: Anode; Graphene; Li3VO4; Lithium ion capacitor; Pseudocapacitance; Lithium ion capacitor; Anode; Li3VO4; Graphene; Pseudocapacitance
• ISSN: 1001-8417
• DOI: 10.1016/j.cclet.2024.109675

A pseudocapacitance dominated anode material assembled from Li3VO4 nanocrystals encapsulated in the interlayers of N-doped graphene has been developed via a facile 2D nanospace confined strategy for lithium ion capacitors (LICs). In this contribution, the N-doped graphene synthesized by a faicle solid state reaction using C3N4 nanosheets as template and glucose as carbon source provides sufficient 2D nanospace for the confined and homogeneous growth of Li3VO4 at the nanoscale, and simultaneously efficiently anchors each nanobuilding block inside the interlayers, thus realizing the utilizaiton of full potential of active components. The so-formed 3D hybrids not only ensure intimate electronic coupling between active materials and N-doped graphene, but also realize robust structure integrity. Owing to these unique advantages, the resulting hybrids show pseudocapacitance dominated lithium storage behaviors with capacitive contributions of over 90% at both low and high current rates. The LVO@C@NG delivers reversible capacities of 206 mAh/g at 10 A/g, capacity retention of 92.7% after 1000 cycles at 2 A/g, and a high energy density of 113.6 Wh/kg at 231.8 W/kg for LICs. A pseudocapacitance dominated anode material assembled from Li3VO4 nanocrystals encapsulated in the interlayers of N-doped graphene has been developed via a 2D nanospace confined strategy for lithium ion capacitors (LICs). Such hybrid materials efficiently combine the advantages of nanoscale Li3VO4 and highly conductive graphene, realizing high-efficiency electron/ion transport and utilization of full potential of active materials. [Display omitted]