|
|||||
|
|
Li3V2(PO4)3 modified LiFePO4/C cathode materials with improved high-rate and low-temperature properties |
|
| Authors: | Zhipeng Ma Guangjie Shao Xu Wang Jianjun Song Guiling Wang |
| Institution: | 1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China 3. The Equipment Research Institute of the General Logistic Department of the CPLA, Beijing, 100010, China |
| Abstract: | LiFePO4/C surface modified with Li3V2(PO4)3 is prepared with a sol–gel combustion method. The structure and electrochemical behavior of the material are studied using a wide range of techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. It is found that LiFePO4/C surface modified with Li3V2(PO4)3 has the better electrochemical performance. The discharge capacity of the as-prepared material can reach up to 153.1, 137.7, 113.6, and 93.3 mAh g?1 at 1, 2, 5, and 10 C, respectively. The capacitance of the LiFePO4/C modified by Li3V2(PO4)3 is higher under lower discharging rate at ?20 °C, and the initial discharge capacity of 0.2 C is 131.4 mAh g?1. It is also demonstrated that the presence of Li3V2(PO4)3 in the sample can reduce the charge transfer resistance in the range of ?20 to 25 °C, resulting in the enhanced electrochemical catalytic activity. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |