Quantum dot heterostructures on N-doped graphene with accelerated diffusion kinetics for stable lithium-ion storage

Shujuan Yin; Yishan Wang; Lianyu Zhao; Yun Sheng; Xueqian Zhang; Xiaoxiao Huang; Guangwu Wen

doi:10.1016/j.jcis.2023.07.092

Quantum dot heterostructures on N-doped graphene with accelerated diffusion kinetics for stable lithium-ion storage

J Colloid Interface Sci. 2023 Nov 15;650(Pt B):1164-1173. doi: 10.1016/j.jcis.2023.07.092. Epub 2023 Jul 14.

Authors

Shujuan Yin¹, Yishan Wang², Lianyu Zhao¹, Yun Sheng¹, Xueqian Zhang³, Xiaoxiao Huang⁴, Guangwu Wen¹

Affiliations

¹ School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.
² School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China. Electronic address: wyslg@sdut.edu.cn.
³ School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China. Electronic address: zhangxueqian@sdut.edu.cn.
⁴ School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

PMID: 37473476
DOI: 10.1016/j.jcis.2023.07.092

Abstract

The high energy density and low self-discharge rate of lithium-ion batteries make them promising for large-scale energy storage. However, the practical development of such electrochemical energy storage systems relies heavily on the development of anode materials with high multiplier capacity and stable cycle life. Here, a simple and efficient one-step hydrothermal method is used to obtain stannide heterostructures, which are loaded on N-doped graphene (SnS₂/SnO₂@NG) that promotes Li⁺ diffusion for fast charge transfer. It is demonstrated that the built-in electric field generated by the electron transfer from electron-rich SnS₂ to SnO₂ in the stannide heterojunction collectively provides abundant cation adsorption sites, accelerating the migration of Li⁺ thus improving the electrochemical reaction kinetics. Besides, the SnS₂/SnO₂ nanoparticles have high structural stability, and the heterojunction compressive stresses obtained from density functional theory (DFT) calculations can significantly limit the structural damage. When applied as anodes in Li⁺ batteries with 300 cycles at 0.5 A/g, we achieved a high reversible capacity of 892.73 mAh/g. The rational design of low-cost batteries for energy storage and conversion can benefit from the quantitative design of fast and persistent charge transfer in a stannide heterostructure.

Keywords: Anodes, SnS(2)/SnO(2) heterostructures; Built-in electric field; Lithium-ion batteries; Stannide.