Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7991778 | Journal of Alloys and Compounds | 2018 | 28 Pages |
Abstract
TiO2 and N-doped carbon co-modified LiFePO4 composites (LFP-TiO2-C-N) have been successfully synthesized by using tetrabutyl titanate (TBOT) and dopamine (DPA) as titanium and N-doped carbon sources, respectively. The LiFePO4 modification is performed by dopamine polymerization in the alkaline environment supplied by the TBOT hydrolyzation process. The resulting LFP-TiO2-C-N materials are characterized by EDS, XPS, TG, ICP and HRTEM to confirm the close adhesion of TiO2 nanoparticles and N-doped carbon layers on the LiFePO4 surfaces. The charge-discharge tests demonstrate that the LFP-TiO2-C-N composites deliver a superior initial capacity of 165.3â¯mAh·gâ1â¯at 0.1â¯C and high rate performance with discharge capacities of 145â¯mAh·gâ1â¯at 1â¯C and 124â¯mAh·gâ1â¯at 2â¯C. The LFP-TiO2-C-N composites can retain 99.4% of the initial capacity after 50 cycles at 1â¯C, revealing a stable cycling stability. Therefore, the synergistic growth of TiO2 and N-doped carbon on the LFP surface could result in the synergic improvement in the electrochemical performance of cathode.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jiayuan Shi, Xiaoqing Zhang, Xiaokun Zhang, Yong Xiang,