Positive electrode composite material and preparation method and application thereof

• Main Authors: SEO YOUNG-IK, LIANG SHIHAN, LEE HENRY, KONG LINGYONG, LI YINENG
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a positive electrode composite material and a preparation method and application thereof. The positive electrode composite material comprises a positive electrode material and a molecular sieve. The molecular formula of the positive electrode material is LixMnyFe1-y-zMzPO4, x is greater than or equal to 0.9 and less than or equal to 1.1, y is greater than or equal to 0 and less than or equal to 1, z is greater than or equal to 0 and less than or equal to 0.3, 1-y-z is greater than or equal to 0 and less than or equal to 1, and M is selected from at least one of Ti, Mg, Si, Zr, Nb, V, Co and Ni. The molecular sieve has hygroscopicity and can adsorb moisture in the positive electrode material and the electrolyte. Moisture in the battery is controlled in a relatively low range by the molecular sieve, so that the moisture is prevented from eroding the positive electrode material, the moisture content in the electrolyte is reduced, side reactions are reduced, the cycle life of the battery is