Heterointerface Engineered Core-Shell Fe[sub.2]O[sub.3]@TiO[sub.2] for High-Performance Lithium-Ion Storage

• Published in: Molecules (Basel, Switzerland) Switzerland), 2023-10, Vol.28 (19)
• Main Authors: Miao, Zeqing, Gao, Kesheng, Li, Dazhi, Gao, Ziwei, Zhao, Wenxin, Li, Zeyang, Sun, Wei, Wang, Xiaoguang, Zhang, Haihang, Wang, Xinyu, Sun, Changlong, Zhu, Yuanyuan, Li, Zhenjiang
• Format: Article
• Language: English
• Subjects: Chemical reaction, Rate of; Computer peripherals industry
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules28196903

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 (Fe[sub.2]O[sub.3]@TiO[sub.2]) 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 Fe[sub.2]O[sub.3]@TiO[sub.2] delivers a remarkable discharge capacity of 1342 mAh g[sup.−1] and an extraordinary capacity retention of 82.7% at 0.1 A g[sup.−1] after 300 cycles. Fe[sub.2]O[sub.3]@TiO[sub.2] shows an excellent rate performance from 0.1 A g[sup.−1] to 4.0 A g[sup.−1]. Further, the discharge capacity of Fe[sub.2]O[sub.3]@TiO[sub.2] reached 736 mAh g[sup.−1] at 1.0 A g[sup.−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 Fe[sub.2]O[sub.3]@TiO[sub.2] 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.