It is understood that international enterprises that can produce lithium iron phosphate products with good comprehensive performance are mainly located in the United States and Canada, but foreign suppliers are unwilling to supply lithium iron phosphate materials to the domestic market alone in order to pursue higher added value. At present, the comprehensive performance of lithium iron phosphate products in China is still far from the international level, which hinders the development of power lithium iron phosphate batteries for electric vehicles in China. The micro nanostructured lithium iron phosphate cathode materials prepared by Cai Feipeng's team are expected to break the monopoly position of foreign manufacturers in this field. "Micrometer ball" has its advantages and disadvantages.