Method of producing in-situ carbon coated lithium iron phosphate cathode material for lithium-ion batteries and the product thereof
Номер патента: EP4267681A1
Опубликовано: 01-11-2023
Автор(ы): Ravula Vijay, Srinivasan Anandan, Tata Narasinga Rao
Принадлежит: International Advanced Research Center for Powder Metallurgy and New Materials ARCI
Опубликовано: 01-11-2023
Автор(ы): Ravula Vijay, Srinivasan Anandan, Tata Narasinga Rao
Принадлежит: International Advanced Research Center for Powder Metallurgy and New Materials ARCI
Реферат: A method of producing high performance carbon coated LiFePO4 powders for making the battery grade cathode for lithium ion battery, comprising the steps of: a) mixing of Li2CO3, FeC2O4, and NH4H2PO4 precursors with different concentrations (3-10%) of citric acid in a stoichiometric ratio of 1.05:1:1; b) adding 2 to 5 % stearic acid; c) milling in a attrition milling unit maintained with the ball to powder ratio of 10:1-12:1 at 250-550 rpm for 2-12 hrs; d) repeating the process of milling by increasing and decreasing the speed for a period of 2 to 24 hrs; e) discharging the milled powders on completion of milling; f) pelletizing them; g) annealing of them under argon atmosphere in large scale furnace at a temperature of 650 - 700 °C with a heating rate of 2-5 °C /min for 2-10 hrs; and h) grinding the annealed pellets to a fine powder.
Lithium iron phosphate positive electrode material, preparation method therefor, and lithium ion battery
Номер патента: CA3218477A1. Автор: Wenyu Cao,ChaQing XU,Yunling XU,Junyue CHEN. Владелец: BYD Co Ltd. Дата публикации: 2022-11-17.