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Updated: Jun 4, 2025

In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
Published on: November 10, 2014
Topological Insulator Heterojunction with Electric Dipole Domain to Boost Polysulfide Conversion in Lithium-Sulfur
Hedong Chen1, Yecheng Qiu1,2, Zhiyuan Cai3
1Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection Materials, School of Electronic Science and Engineering (School of Microelectronics), South China Normal University, Foshan, 528225, P. R. China.
Abstract:
The heterojunction materials are considered as promising electrocatalyst candidates that empower advanced lithium-sulfur (Li-S) batteries. However, the detailed functional mechanism of heterojunction materials to boost the sulfur redox reaction kinetics remains unclear. Herein, we construct a multifunctional potential well-type Bi2Te3/TiO2 topological insulator (TI) heterojunction with electric dipole domain to elucidate the synergistic mechanism, which facilitates rapid mass transport, strengthens polysulfide capture ability and accelerates polysulfide conversion. Therefore, the Li-S battery with Bi2Te3/TiO2 TI heterojunction modified separator achieves high utilization of sulfur cathode, delivering a high reversible specific capacity of 1375 mAh g-1 at 0.2 C and long cycling capability with a negligible capacity decay of 0.022 % per cycle over 1000 cycles at 1 C. Even with the high sulfur loading of 13.2 mg cm-2 and low E/S ratio of 3.8 μL mg-1, a high area capacity of 11.2 mAh cm-2 and acceptable cycling stability can be obtained. This work provides guidance for designing high-efficiency TI heterojunctions to promote the practical application of Li-S batteries.
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