As a precursor of lithium iron phosphate,increasing the specific surface area of iron phosphate is beneficial to reducing the charge transfer impedance and improving the rate performance lithium iron phosphate batteries.By changing the drip order and reaction temperature of ammonia and hydrogen peroxide in the acid process,the crystallization conditions of iron phosphate are affected,and the initial morphology of i-ron phosphate is affected to regulate the crystallization process,in order to explore the factors affecting the specific surface area of iron phos-phate.The results showed that when the iron phosphorus ratio was greater than 0.98,changing the order of ammonia addition resulted in an in-crease in specific surface area.When changing the order of hydrogen peroxide addition and the amount of hydrogen peroxide added for the first time was half,the specific surface area was above 6.9m2/g.When the reaction temperature was 70 ℃,the specific surface area increased.
关键词
磷酸铁/比表面积/顺序/铁磷比/反应温度
Key words
Iron Phosphate/Specific Surface Area/Order/Iron Phosphorus Ratio/Reaction Temperature
维普
万方数据