Carbothermal reduction preparation and performance of LiFePO4/C by using ammonium jarosite extracted from vanadium slag as iron source
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LiFePO4/C cathode materials are synthesized by carbothermal reduction process using ammonium jarosite as iron source and rock sugar as carbon source. The ammonium jarosite is synthesized from the iron-rich lixivium which is obtained from the extracted vanadium residue by ammonium sulfate roasting and deionized water leaching. The effects of different molar ratios of C to LiFePO4 on the performance of the as-synthesized LiFePO4/C have been scrutinized using charge–discharge cycling and electrochemical impedance spectroscopy (EIS). The result shows that the LiFePO4/C sample with a molar ratio of C to LiFePO4 of 1.2 prepared from ammonium jarosite exhibits an initial discharge capacity of 163.8 mAh g−1 at the current density of 0.1 C, which is about 96% of the theoretical capacity, and the highest average discharge specific capacity, which is 162.3, 154.9, and 120.9 mAh g−1 at the current density of 0.05, 0.1, and 1 C, respectively. EIS results reveal that the cathode exhibits the lowest charge transfer resistance at 200.8 Ω with a molar ratio of C to LiFePO4 of 1.2. This work proposes a novel and effective method to utilize the industrial waste residue.
KeywordsCathode material LiFePO4 Industrial waste residue Ammonium jarosite Ammonium sulfate roasting
This work was financially supported by the National Natural Science Foundation of China (No. 51674068, 51704064, 51874079, 51804035), Natural Science Foundation of Hebei Province (No. E2018501091), The Training Foundation for Scientific Research of Talents Project, Hebei Province (No.A2016005004), Hebei Province higher education science and technology research project (No.QN2017403), The Fundamental Research Funds for the Central Universities (No. N172302001, N182312007, N182304015), and Qinhuangdao City University student of Science and Technology Innovation and Entrepreneurship Project (No. PZB1810008T-46, PZB1810008T-14).
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