材料科学
石墨烯
法拉第效率
碳纳米管
锂(药物)
纳米复合材料
超级电容器
钛酸锂
复合材料
尖晶石
碳纤维
阳极
纳米技术
化学工程
电容
锂离子电池
复合数
电极
电池(电)
热力学
物理化学
功率(物理)
化学
医学
物理
工程类
内分泌学
冶金
作者
Vladislav V. Shunaev,Alexander A. Petrunin,Haifei Zhan,Olga E. Glukhova
出处
期刊:Materials
[Multidisciplinary Digital Publishing Institute]
日期:2023-04-21
卷期号:16 (8): 3270-3270
被引量:1
摘要
The combination of spinel Li4Ti5O12 (LTO) with carbon nanostructures, such as graphene (G) and carbon nanotubes (CNTs), provides all of the required properties for modern chemical power sources such as Li-ion batteries (LIBs) and supercapacitors (SCs). G/LTO and CNT/LTO composites demonstrate a superior reversible capacity, cycling stability, and good rate performances. In this paper, an ab initio attempt to estimate the electronic and capacitive properties of such composites was made for the first time. It was found that the interaction between LTO particles and CNTs was higher than that with graphene due to the larger amount of transfer charge. Increasing the graphene concentration raised the Fermi level and enhanced the conductive properties of G/LTO composites. For CNT/LTO samples, the radius of CNT did not affect the Fermi level. For both G/LTO and CNT/LTO composites, an increase in the carbon ratio resulted in a similar reduction in quantum capacitance (QC). It was observed that during the charge cycle in the real experiment, the non-Faradaic process prevailed during the charge cycle, while the Faradaic process prevailed during the discharge cycle. The obtained results confirm and explain the experimental data and improve the understanding of the processes occurring in G/LTO and CNT/LTO composites for their usages in LIBs and SCs.
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