Heterointerface Engineered Core-Shell Fe<sub>2</sub>O<sub>3</sub>@TiO<sub>2</sub> for High-Performance Lithium-Ion Storage
Zeqing Miao,
Kesheng Gao,
Dazhi Li,
Ziwei Gao,
Wenxin Zhao,
Zeyang Li,
Wei Sun,
Xiaoguang Wang,
Haihang Zhang,
Xinyu Wang,
Changlong Sun,
Yuanyuan Zhu,
Zhenjiang Li
Affiliations
Zeqing Miao
Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Kesheng Gao
Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Dazhi Li
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Ziwei Gao
Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
Wenxin Zhao
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Zeyang Li
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Wei Sun
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Xiaoguang Wang
Sino-German Institute of Technology, Qingdao University of Science and Technology, Qingdao 266100, China
Haihang Zhang
Sino-German Institute of Technology, Qingdao University of Science and Technology, Qingdao 266100, China
Xinyu Wang
Sino-German Institute of Technology, Qingdao University of Science and Technology, Qingdao 266100, China
Changlong Sun
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Yuanyuan Zhu
Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou 234000, China
Zhenjiang Li
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
The rational design of the heterogeneous interfaces enables precise adjustment of the electronic structure and optimization of the kinetics for electron/ion migration in energy storage materials. In this work, the built-in electric field is introduced to the iron-based anode material (Fe2O3@TiO2) through the well-designed heterostructure. This model serves as an ideal platform for comprehending the atomic-level optimization of electron transfer in advanced lithium-ion batteries (LIBs). As a result, the core-shell Fe2O3@TiO2 delivers a remarkable discharge capacity of 1342 mAh g−1 and an extraordinary capacity retention of 82.7% at 0.1 A g−1 after 300 cycles. Fe2O3@TiO2 shows an excellent rate performance from 0.1 A g−1 to 4.0 A g−1. Further, the discharge capacity of Fe2O3@TiO2 reached 736 mAh g−1 at 1.0 A g−1 after 2000 cycles, and the corresponding capacity retention is 83.62%. The heterostructure forms a conventional p-n junction, successfully constructing the built-in electric field and lithium-ion reservoir. The kinetic analysis demonstrates that Fe2O3@TiO2 displays high pseudocapacitance behavior (77.8%) and fast lithium-ion reaction kinetics. The capability of heterointerface engineering to optimize electrochemical reaction kinetics offers novel insights for constructing high-performance iron-based anodes for LIBs.
