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

作者：Zhang, Yanyu; Qian, Shangshu; Zhu, Haojie; Cheng, Xing; Ye, Wuquan; Yu, Haoxiang; Yan, Lei; Shui, Miao; Shu, Jie^*

来源：Ceramics International, 2017, 43(15): 12357-12361.

DOI：10.1016/j.ceramint.2017.06.101

• SrLi2Ti6O14
• C/N coating
• Anode material
• In-situ XRD

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 100 mA g(-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.

• 出版日期2017-10-15
• 单位宁波大学