2results about How to "Effective doping" patented technology

The invention discloses a high-capacity long-cycle lanthanum-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, relates to the technical field of sodium ion batteries, and aims to solve the problem that an existing NVP material is difficult to have high capacity and structural stability at the same time. The technical key points of the invention are as follows: the high-capacity long-cycle lanthanum-doped sodium vanadium phosphate positive electrode material is provided, the high-capacity long-cycle lanthanum-doped sodium vanadium phosphate positive electrode material contains an NVP type material with a composition formula (I) and Na < 3 + x > V < 2-y > Lay (PO4) 3 / C (I), x and y meet the following formula, x is more than 0 and less than or equal to 0.5, y is more than or equal to 0.01 and less than or equal to 0.06, and C is an amorphous carbon layer which is formed by in-situ carbonization and uniformly coats the surfaces of material particles. The rare earth La element is introduced to dope the V site, crystal lattices are expanded, a wider channel is provided for de-intercalation of sodium ions, meanwhile, La doping is beneficial to stabilization of the crystal structure, and the transmission behavior of the sodium ions is optimized; on the basis of inheriting the advantage of ultrahigh capacity of a sodium-rich strategy, the cycling stability of the material is remarkably improved.

The application relates to a kind of surface nano fluorinated scandium lithium layer modification and near surface anion and cation co-doped nickel cobalt manganese ternary positive electrode material and its preparation method, belong to chemical energy storage battery technical field.According to the molar ratio of Li, Sc and F element 3:1:6, lithium salt, scandium salt and fluorine salt are weighed respectively, then ultrasonic is added in ethanol aqueous solution and is fully stirred to obtain mixed salt solution;Nickel cobalt manganese ternary positive electrode material is added to the mixed salt solution, heated and stirred until the suspension is dry, and then dried to obtain a powder;The powder is calcined in oxygen atmosphere to obtain a kind of surface nano fluorinated scandium lithium layer modification and near surface anion and cation co-doped modified nickel cobalt manganese ternary positive electrode material.The synergistic effect of Li3ScF6 surface coating and near surface lattice Sc, F co-doping improves the electrochemical performance and thermal stability of nickel cobalt manganese ternary positive electrode material.