Ion‐insertion capacitors show promise to bridge the gap between supercapacitors of high power densities and batteries of high energy densities. While research efforts have primarily focused on Li+‐based capacitors (LICs), Na+‐based capacitors (SICs) are theoretically cheaper and more sustainable. Owing to the larger size of Na+ compared to Li+, finding high‐rate anode materials for SICs has been challenging. Herein, an SIC anode architecture is reported consisting of TiO2 nanoparticles anchored on a sheared‐carbon nanotubes backbone (TiO2/SCNT). The SCNT architecture provides advantages over other carbon architectures commonly used, such as reduced graphene oxide and CNT. In a half‐cell, the TiO2/SCNT electrode shows a capacity of 267 mAh g−1 at a 1 C charge/discharge rate and a capacity of 136 mAh g−1 at 10 C while maintaining 87% of initial capacity over 1000 cycles. When combined with activated carbon (AC) in a full cell, an energy density and power density of 54.9 Wh kg−1 and 1410 W kg−1, respectively, are achieved while retaining a 90% capacity retention over 5000 cycles. The favorable rate capability, energy and power density, and durability of the electrode is attributed to the enhanced electronic and Na+ conductivity of the TiO2/SCNT architecture.
Enhanced Ionic/Electronic Transport in Nano‐TiO2/Sheared CNT Composite Electrode for Na+ Insertion‐based Hybrid Ion‐Capacitors
Sai-nan Luo,Tao Yuan,Luke Soule,Jiafeng Ruan,Yahui Zhao,Dalin Sun,Junhe Yang,Meilin Liu,Shiyou Zheng
Published 2019 in Advanced Functional Materials
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- Publication year
2019
- Venue
Advanced Functional Materials
- Publication date
2019-11-18
- Fields of study
Materials Science, Chemistry, Engineering
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