Performance improvement of silicon using Ni@C metal–organic frameworks as anode for lithium-ion batteries

• Published in: Ionics 2022, Vol.28 (9), p.4169-4175
• Main Authors: su, Mingru, Fu, Kai, Liu, Xuan, Liu, Hongjia, Zhou, Yu, Chen, Yichang, Gao, Tian, Dou, Aichun, Hou, Xiaochuan, Liu, Yunjian
• Format: Article
• Language: English
• Subjects: Amino acids; Charge materials; Charge transfer; Chelation; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrical resistivity; Electrochemical analysis; Electrochemistry; Electrode materials; Energy Storage; Liquid phases; Lithium-ion batteries; Metal-organic frameworks; Optical and Electronic Materials; Original Paper; Performance enhancement; Rechargeable batteries; Renewable and Green Energy; Ring structures; Silicon
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-022-04675-4

To improve the electrochemical performance of silicon as a negative electrode material for lithium-ion batteries, a Ni@C-MOF material synthesized in an amino acid system by the liquid phase method was proposed to improve the performance of silicon. XRD results show that the Ni@C-MOF material was composed of Ni and a small amount of NiO. SEM and TEM observations reveal that the Ni-based metal framework with a chelating ring structure was successfully prepared. The electrochemical performance of the Si/Ni@C-MOF composite was improved. At 0.1 A g −1 , the Si/Ni@C-MOF sample exhibits a high initial charge capacity of 875.7 mAh·g −1 between 0.01 and 2 V, and the capacity retention is above 70% after 100 cycles. Ni@C-MOF not only provides a stable metal framework but also constructs a conductive network for silicon, which is beneficial for limiting the volume effect of silicon during the alloy/de-alloy process and improving its electrical conductivity. EIS results show that Ni@C-MOF material delivers a low charge transfer resistance.