普鲁士蓝钠离子电池正极材料高收率合成过程及性能

High yield synthesis process and performance of prussian blue cathode materials for sodium ion batteries

用高氯酸盐前躯体制备普鲁士蓝（PB）材料,考察了合成过程中前驱体成分、溶液温度、钠盐添加量及杂质含量对材料性能的影响.结果表明,氯化亚铁作铁源时,不清洗的普鲁士蓝产物中含Na Cl杂质,电化学性能明显低于经多次清洗的产物;高氯酸亚铁作铁源时,不清洗直接收集的普鲁士蓝产物初始放电容量略低于清洗产物,但长期循环稳定性更好,免清洗工艺可明显提高普鲁士蓝材料的收率,少量高氯酸钠杂质存在提高了材料的循环性能.

A high yield preparation method for prussian blue（PB） by using perchlorate precursors was explored. The influence of compositions of the precursor solution, preparation temperature, sodium salt addition and impurities in the final products on the electrochemical properties of final PB products were investigated. The results showed that the existence of impurities lead to a slight decrease of specific capacity. For PB material prepared using Fe Cl2 precursor, electrochemical performance of the unwashed sample was obvious inferior to that of the washed sample due to the existence of Na Cl impurity. On the other hand, for the PB material prepared by using Fe（Cl O4）2 precursor, initial discharge capacity of PB product without being clean washed was slightly lower than being washed but showed better cycling stability due to the existence of small amount of Na Cl O4 impurity. The unwash synthesis route leads to a high yield of PB product.