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At present, from the perspective of positive and negative electrodes, domestic and foreign manufacturers mainly use the positive electrode material system of lithium iron phosphate. In the European and American power lithium battery markets, lithium iron phosphate is mainly used, while Japan and South Korea mainly use the ternary system. It can be said that the power lithium battery of lithium iron phosphate system is still the most mature and safe lithium-ion power lithium battery at present.
Although lithium iron phosphate is one of the phosphate systems with almost the lowest energy density. But if the core material content of the entire positive electrode can be increased to over 30% in the positive electrode system, then its actual energy density will be significantly increased. For example, in a lithium rich system, when made into a battery, the energy density of a single battery can reach over 300Wh/kg, even exceeding the current energy density achieved by ternary systems.
While increasing the specific energy of the positive electrode material, increasing the specific energy of the negative electrode material is also a major technological breakthrough direction. If 370 graphite is still used as the negative electrode material in current lithium iron phosphate batteries, achieving high specific energy is indeed quite difficult. So now, high specific energy materials based on silicon, including selenium, are highly valued in the industry.
Therefore, under the current system, if lithium iron phosphate can be fully prepared and the energy density can reach around 120Wh/kg, there should be no problem with electric vehicles.
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