Journal Article

Heterointerface Engineered Core-Shell Fesub.2Osub.3@TiOsub.2 for High-Performance Lithium-Ion Storage

Gao, Ziwei, Wang, Xinyu, Li, Dazhi, Li, Zhenjiang, Li, Zeyang, Sun, Wei, Zhu, Yuanyuan, Wang, Xiaoguang, Miao, Zeqing, Gao, Kesheng, Zhao, Wenxin, Zhang, Haihang, Sun, Changlong

2023

Overview

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.

• Publisher: MDPI AG
• Subject: Chemical reaction, Rate of / Computer peripherals industry