金属有机骨架衍生纳米多孔碳和钛酸锂构筑高性能锂离子混合电容器

doi:10.12066/j.issn.1007-2861.2143

Abstract

Abstract:

Li-ion hybrid capacitors, which combine the high energy densities of Li-ion batteries and high power densities of super capacitors, are a new type of energy storage device with large application potentials. In this study, a porous carbon nanomaterial (carbonized zeolitic imidazolate framework-8 (cZIF-8)) derived from metal organic frameworks (MOFs) was synthesised by pyrolysis of a MOF precursor at a high temperature. This carbon material had a large specific surface area, excellent porosity, good thermal stability, and high conductivity. A new type of Li-ion hybrid capacitor (cZIF-8//lithium titanate (LTO)) was constructed using a capacitor electrode based on cZIF-8 as a positive electrode and battery electrode based on LTO as a negative electrode. The assembled device had highest energy density of 44 W·h·kg^-1 and power density of 5387 W$\cdot$kg$^{-1}$, significantly higher than that of a cZIF-8//cZIF-8 supercapacitor (16.6 W·h·kg^-1). The Li-ion hybrid capacitor (cZIF-8//LTO) also exhibited a good cyclic performance (85.4% of the initial value after 10000 cycles) at a high current density of 2 A·g^-1. This MOF-based Li-ion hybrid capacitor enables to effectively increase the energy density of the electrochemical energy storage device without reducing the power capability.

Key words: porous carbon nanomaterial, metal organic framework (MOF)-derived material, lithium titanate (LTO), Li-ion hybrid capacitor

CLC Number:

TQ316.3

YAO Weiwei, MAO Jian, ZHANG Chen, LI Zhen, WU Minghong. High-performance Li-ion hybrid capacitor with metal organic framework-derived porous carbon nanomaterial and lithium titanate[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(6): 963-971.

Figures/Tables 10

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High-performance Li-ion hybrid capacitor with metal organic framework-derived porous carbon nanomaterial and lithium titanate

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