Inorganic Chemicals Industry >
Study on preparation of battery grade ferric phosphate by co-precipitation of ferric nitrate and phosphoric acid
Received date: 2022-09-11
Online published: 2023-07-13
By using ferric nitrate and phosphoric acid as raw materials，the co-precipitation method was used to prepare the battery grade ferric phosphate.The effects of reaction temperature，reactant concentration，feeding proportion and reaction time on the yield and particle size of ferric phosphate were studied，and the optimal process conditions were obtained through orthogonal optimization：the solution concentration of Fe（NO3）3 was 1.1 mol/L，the feed ratio of phosphoric acid to ferric nitrate was 1.1，the reaction temperature was 90 ℃，and the reaction time was 8 h.The prepared iron phosphate was characterized by scanning electron microscopy（SEM），laser particle size analyzer，X-ray diffractometer（XRD） and TG-DTA.The analysis results showed that the obtained ferrophosphate dihydrate was monoclinic crystal with high purity and secondary particle size D50 of 2.41 μm，which met the requirements of battery grade ferrophosphate.The performance of LiFePO4/C prepared by the precursor system of iron phosphate was good.The initial discharge specific capacity of the battery composed of iron phosphate as cathode materials were 143.9，136.8 and 131.4 mA·h/g at 0.05C，0.1C and 1C，respectively.
WANG Zihan , LI Jun , CHEN Ming , ZHOU Qingyu . Study on preparation of battery grade ferric phosphate by co-precipitation of ferric nitrate and phosphoric acid[J]. Inorganic Chemicals Industry, 2023 , 55(7) : 51 -57 . DOI: 10.19964/j.issn.1006-4990.2022-0548
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