In-situ encapsulation of pseudocapacitive Li2TiSiO5 nanoparticles into fibrous carbon framework for ultrafast and stable lithium storage. (January 2019)

• Record Type: Journal Article
• Authors: Wang, Shijie; Wang, Rutao; Bian, Ye; Jin, Dongdong; Zhang, Yabin; Zhang, Li
• Is Part Of: Nano energy. Volume 55(2019)
• Page Start: 173
• Page End: 181
• Publication Date: 2019-01
• Subjects: Li2TiSiO5 -- Lithium ion capacitor -- Pseudocapacitive -- Electrospinning -- Nanofiber; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2018.10.052
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Lithium-ion capacitors (LICs) emerge as the promising energy storage devices owing to their enhanced power density compared to batteries and superior energy density to electric double-layer capacitors. However, the wide use of graphite anodes in LICs results in intrinsic problems such as sluggish reaction kinetics and dendritic Li plating problem, while Li4 Ti5 O12 -based electrodes exhibit low energy storage capacity and excessively high insertion potential. Herein, our research uncovers the synthesis of novel Li2 TiSiO5 and carbon nanofibers (LTSO/C) via a morphology-preserved thermal transformation strategy as the high-performance anodes of LICs. LTSO/C electrodes with the unique 3D interconnected nanoarchitecture consisting of aggregation-free LTSO nanoparticles exbibit high-rate behavior ( ca. 50% capacity retention from 0.1 to 10 A g −1 ), suitable Li + insertion potential (0.1–1 V vs. Li/Li + ), and high packing density of 1.93 g cm −3 (highly comparable to graphite and larger than Li4 Ti5 O12 ). Moreover, analysis on reaction kinetics has revealed that such high-rate performance can be attributed to the pseudocapacitive charge storage mechanism of as-synthesized LTSO/C electrodes. Afterwards, novel LICs employing LTSO/C anodes to replace graphite and Li4 Ti5 O12 further yield high working potential of 4.2 V and large gravimetric energy and power densities. These results thus suggest a great promise of the proposed materials selection and nanostructure design for ultrafast and stable energy storage devices. Graphical abstract: fx1 Highlights: 3D interconnected fibrous nanostructure of LTSO/C is synthesized by electrospinning. Such LTSO/C exhibit superior rate capability as anodes of lithium-ion capacitors. The high-rate capability is attributed to pseudocapacitive charge storage mechanism. Assembled full-cell lithium-ion capacitors have high working potential up to 4.2 V.