Diamond like LiFePO4 as cathode material for high energy Lithium ion batteries

A novel method has been developed to fabricate LiFePO4 diamond arrays, during which polyethylene glycol was employed as the template. After being hydrothermally processed at 160 0C, the highly-crystallized LiFePO4 arrays were directly obtained. Which are composed of single crystal diamond with a thickness of 550 nm - 2.5 μm. the reported synthesis is simple, mild and energy efficient. The structural, morphological and electrochemical properties were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry. To further understand the electrochemical performance of powder, the galvanostatic charge-discharge curves of the sample were measured. Content Fe3+ and Li+ of samples were tested with spectrophotometric method and flame AAS ,respectively. Diamond shaped LFP exhibit the best original capacities. The results showed that initial discharge capacity of LiFePO4 was 143 mAh g−1.The results from CV and EIS suggested that the diamond-like LFP during the chargedischarge which led to enhance Li ion diffusion and electrochemical performance

Keywords:

LiFePO4 , Cathode , Li-ion battery