Abstract
Abstract SrLi 2 Ti 6 O 14 @C/N is synthesized by using a solid-state assisted solution method, with polyvinyl pyrrolidone (PVP) as carbon/nitrogen source. The morphology of SrLi 2 Ti 6 O 14 and SrLi 2 Ti 6 O 14 @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 SrLi 2 Ti 6 O 14 . 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). SrLi 2 Ti 6 O 14 @C/N (initial charge capacity of 166.41 mAh g −1 ) shows enhanced electrochemical capability compared with SrLi 2 Ti 6 O 14 (156.06 mAh g −1 ). After 150 cycles, SrLi 2 Ti 6 O 14 @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 SrLi 2 Ti 6 O 14 @C/N. All the results prove that the C/N coating has a positive effect on the electrochemical performance of SrLi 2 Ti 6 O 14 .
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