Improved pseudocapacitive charge storage in highly ordered mesoporous TiO2/carbon nanocomposites as high-performance Li-ion hybrid supercapacitor anodes.

Yujin Lee,Eunho Lim,Kwang Chul Roh,Jeong Han Lee,Jinwoo Lee,Seoa Kim

doi:10.1039/c9ra07157a

Abstract

A Li-ion hybrid supercapacitor (Li-HSCs), an integrated system of a Li-ion battery and a supercapacitor, is an important energy-storage device because of its outstanding energy and power as well as long-term cycle life. In this work, we propose an attractive material (a mesoporous anatase titanium dioxide/carbon hybrid material, m-TiO2-C) as a rapid and stable Li+ storage anode material for Li-HSCs. m-TiO2-C exhibits high specific capacity (∼198 mA h g−1 at 0.05 A g−1) and promising rate performance (∼90 mA h g−1 at 5 A g−1) with stable cyclability, resulting from the well-designed porous structure with nanocrystalline anatase TiO2 and conductive carbon. Thereby, it is demonstrated that a Li-HSC system using a m-TiO2-C anode provides high energy and power (∼63 W h kg−1, and ∼4044 W kg−1).

Highlights

High-power energy-storage devices have been regarded as indispensable systems for medium- and large-scale energystorage applications such as electric vehicles (EVs) and smart grid technologies
We propose an attractive material as a rapid and stable Li+ storage anode material for Li-HSCs. m-TiO2-C exhibits high specific capacity ($198 mA h gÀ1 at 0.05 A gÀ1) and promising rate performance ($90 mA h gÀ1 at 5 A gÀ1) with stable cyclability, resulting from the well-designed porous structure with nanocrystalline anatase TiO2 and conductive carbon
Thereby, it is demonstrated that a Li-HSC system using a m-TiO2C anode provides high energy and power ($63 W h kgÀ1, and $4044 W kgÀ1)

Summary

Introduction

High-power energy-storage devices have been regarded as indispensable systems for medium- and large-scale energystorage applications such as electric vehicles (EVs) and smart grid technologies. We propose an attractive material (a mesoporous anatase titanium dioxide/carbon hybrid material, m-TiO2-C) as a rapid and stable Li+ storage anode material for Li-HSCs. m-TiO2-C exhibits high specific capacity ($198 mA h gÀ1 at 0.05 A gÀ1) and promising rate performance ($90 mA h gÀ1 at 5 A gÀ1) with stable cyclability, resulting from the well-designed porous structure with nanocrystalline anatase TiO2 and conductive carbon.

Results

Conclusion