SnO/Sn with core-shell structure Schottky heterojunctions loaded in graphene to promote electrochemical reaction kinetics and enable efficient lithium-ion storage

• Published in: Physical chemistry chemical physics : PCCP 2024-07, Vol.26 (28), p.19497-1954
• Main Authors: Yin, Shujuan, Zhang, Xueqian, Liu, Dongdong, Zhou, Lijuan, Wen, Guangwu, Wang, Yishan, Huang, Xiaoxiao
• Format: Article
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d4cp02118e

The stannic oxide (SnO 2 ) anode expands in volume during cycling causing a decrease in reversible capacity. In this work, we generated a spherical SnO 2 /Sn heterojunction with core-shell structure composites encapsulated by graphene (SnO 2 /Sn/G) in situ using a simple one-step hydrothermal and subsequent annealing process. SnO 2 /Sn heterojunction nanospheres dispersed in a porous graphene framework accelerate the diffusion kinetics of electrons and ions. In addition, the structure plays a key role in mitigating large volume changes and nanostructure agglomeration. As a result, SnO 2 /Sn/G exhibits excellent performance as an anode material for lithium-ion batteries (LIBs), maintaining a reversible specific capacity of 720.6 mA h g −1 even after 600 cycles at a current density of 0.5 A g −1 . Herein, to better construct homogeneous heterostructures, we synthesize Schottky heterojunction composites in situ , which utilize a three-dimensional porous graphene carbon material to form more SnO 2 /Sn/G heterointerfaces and oxygen vacancies.