Synthesis of heterointerfaces in NiO/SnO coated nitrogen-doped graphene for efficient lithium storage

• Published in: Physical chemistry chemical physics : PCCP 2024-01, Vol.26 (4), p.3415-3423
• Main Authors: Yin, Shujuan, Zhang, Xueqian, Liu, Dongdong, Huang, Xiaoxiao, Wang, Yishan, Wen, Guangwu
• Format: Article
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d3cp04892f

Currently, it remains a challenge to make comprehensive improvements to overcome the disadvantages of volume expansion, Li 2 O irreversibility and low conductivity of SnO 2 . Heterostructure construction has been investigated as an effective strategy to promote electron transfer and surface reaction kinetics, leading to high electrochemical performance. Herein, NiO/SnO 2 heterojunction modified nitrogen doped graphene (NiO/SnO 2 @NG) anode materials were prepared using hydrothermal and carbonization techniques. Based on the excellent structural advantages, sufficiently small NiO/SnO 2 heterojunction nanoparticles increase the interfacial density to promote Li 2 O decomposition, and the built-in electric field accelerates the charge transport rate to improve the conductivity. The three-dimensional porous graphene framework effectively mitigates volume expansion during cycling and stabilizes the reactive interface of electrode materials. The results show that the NiO/SnO 2 @NG mixture has high reversible specific capacity (938.8 mA h g −1 after 450 cycles at 0.1 A g −1 ), superior multiplicity performance (374.5 mA h g −1 at 3.0 A g −1 ) and long cycle life (685.3 mA h g −1 after 1000 cycles at 0.5 A g −1 ). Thus, this design of introducing NiO to form heterostructures with SnO 2 is directly related to enhancing the electrochemical performance of lithium-ion batteries (LIBs). NiO/SnO 2 heterojunction modified nitrogen doped graphene were prepared using hydrothermal and carbonization techniques. Experiments suggest that built-in electric fields will accelerate ion migration and improve electrochemical reaction kinetics.