PVP derived C/N coated SrLi2Ti6O14 as high performance anode material for lithium ion battery

• Published in: Ceramics international Vol. 43; no. 15; pp. 12357 - 12361
• Main Authors: Zhang, Yanyu, Qian, Shangshu, Zhu, Haojie, Cheng, Xing, Ye, Wuquan, Yu, Haoxiang, Yan, Lei, Shui, Miao, Shu, Jie
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.10.2017
• Subjects: Anode material; C/N coating; In-situ XRD; SrLi2Ti6O14; Anode material; SrLi2Ti6O14; C/N coating; In-situ XRD
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2017.06.101

SrLi2Ti6O14@C/N is synthesized by using a solid-state assisted solution method, with polyvinyl pyrrolidone (PVP) as carbon/nitrogen source. The morphology of SrLi2Ti6O14 and SrLi2Ti6O14@C/N samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and elemental mappings. According to the results, C/N layer is uniformly coated on the surface of SrLi2Ti6O14. Subsequently, the two samples are analyzed by using electrochemical measurements such as galvanostatic charge/discharge tests, rate performance, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). SrLi2Ti6O14@C/N (initial charge capacity of 166.41 mAh g−1) shows enhanced electrochemical capability compared with SrLi2Ti6O14 (156.06 mAh g−1). After 150 cycles, SrLi2Ti6O14@C/N can keep a reversible capacity of 156.58 mAh g−1 with only 5.98% capacity loss at 100mAg−1. The improvement is due to the increase of electronic conductivity and the decrease in the redox polarization after coating. Moreover, in-situ XRD is also used to investigate the structural stability of SrLi2Ti6O14@C/N. All the results prove that the C/N coating has a positive effect on the electrochemical performance of SrLi2Ti6O14.