材料科学
阳极
纳米纤维
电化学
碳纳米纤维
锂(药物)
离子
静电纺丝
电极
电导率
兴奋剂
碳纤维
氮气
化学工程
纳米技术
碳纳米管
复合数
复合材料
物理化学
化学
光电子学
有机化学
医学
聚合物
内分泌学
工程类
作者
Junfang Liu,Dongxu Su,Li Liu,Zhixiao Liu,Su Nie,Yue Zhang,Jing Xia,Hui Deng,Xianyou Wang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2020-01-01
卷期号:12 (38): 19702-19710
被引量:9
摘要
Li2TiSiO5 (LTSO) has a theoretical specific capacity of up to 315 mA h g-1 with a suitable working potential (0.28 V vs. Li/Li+). However, the electronic structure of Li2TiSiO5 is firstly investigated by theoretical calculation based on the first-principles approach, and the results demonstrate that Li2TiSiO5 acts as the insulator for transferring electrons. Therefore, the framework with better conductivity is very essential for Li2TiSiO5 to enhance the charge transfer kinetics. Nitrogen-doped carbon encapsulated Li2TiSiO5 nanofibers (LTSO/NDC nanofibers) are obtained by using carbamide as a nitrogen source through an electrospinning technique. The nitrogen-doped carbon matrix with high electronic conductivity improves the electrochemical properties of LTSO significantly. The diffusion coefficient of lithium ions (DLi+) is greatly improved by manual calculation. The LTSO/NDC nanofiber electrode can deliver 371.7 mA h g-1 at 0.1 A g-1 and 361.1 mA h g-1 at 0.2 A g-1, and also shows a comparable cycle performance which could endure a long cycle over 800 cycles at 0.5 A g-1 almost without capacity decay. Hence, the LTSO/NDC nanofiber anode with a high rate and a long life provides a new direction for the realization of LTSO-based compounds in lithium ion batteries.
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