Carbon aerogel capsulated cobalt oxides with nanomicro-hierarchical architectures as anodes for lithium-ion batteries

• Published in: New journal of chemistry 2024-05, Vol.48 (21), p.9486-9497
• Main Authors: Liao, Lixia, Ma, Ting, Fang, Tao, Zhang, Jiyuan, Chai, Bo, Zhu, Lian, Ding, Jiaqi, Kou, Huizhi, Xu, Yuling, Hou, Yuanjing, Wei, Benmei
• Format: Article
• Language: English
• Subjects: Aerogels; Anodes; Carbon; Cobalt oxides; Energy storage; Ion diffusion; Lithium; Lithium-ion batteries; Rechargeable batteries; Storage capacity
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d3nj05671f

N-doped carbon aerogel capsulated Co 3 O 4 (Co 3 O 4 @NCA) is prepared via a hydrothermal method using an N-doped carbon aerogel (NCA) as a conductive carbon matrix and coating layer. Kinetic parameters are investigated using CV and GITT methods, and the improved performance could be ascribed to rapid lithium-ion diffusion and enhanced pseudocapacitance contribution induced by the introduction of carbon aerogel conductive matrices and the construction of porous nanomicro-hierarchical architectures, which endow the material with a large surface area, good conductivity, abundant pore channels, and plentiful defects and active sites, thus greatly increasing the lithium storage capacity. Used as an anode for lithium-ion batteries, Co 3 O 4 @NCA-1 displays a reversible capacity of 600.2 mA h g −1 during the 200th cycle under 100 mA g −1 , 5.13 times larger than the specific charge capacity of 116.8 mA h g −1 for Co 3 O 4 samples. Even if the current density is increased to 1 A g −1 , it has 4.48 times the charge capacity of pure Co 3 O 4 . The Co 3 O 4 modification strategy using NCA as a matrix to fabricate nanomicro-hierarchical architectures demonstrates potential applications in the energy storage field. N-doped carbon aerogel capsulated Co 3 O 4 (Co 3 O 4 @NCA) is prepared via a hydrothermal method using an N-doped carbon aerogel (NCA) as a conductive carbon matrix and coating layer.