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1.发明公开
公开(公告)号：EP4084136A1
公开(公告)日：2022-11-02
申请号：EP19957734.7
申请日：2019-12-27
发明人： XU, Kaihua , JIANG, Zhenkang , ZHANG, Kun , XUE, Xiaofei , LI, Cong , SUN, Haibo , CHEN, Kang , LI, Jun , FAN, Liangjiao
摘要： A method for preparing a MOF-coated monocrystal ternary positive electrode material and a precursor thereof. Firstly, a solution A of nickel, cobalt, and manganese metal salts is prepared according to a molar ratio, and an ammonia complexing agent solution and a caustic soda liquid are prepared. Then the solution A, the ammonia complexing agent solution, and the caustic soda liquid are added to a reactor and reacted to obtain a precursor core. Afterwards, an organic carboxylate is dissolved in an organic solvent to obtain a solution B. The B solution and a manganese metal salt solution are added to the above reactor and reacted, and a MOF-coated core-shell structure precursor is obtained after aging. The core-shell structure precursor is pre-sintered at a low temperature to obtain a nickel-cobalt-manganese oxide with a monocrystal structure. The nickel-cobalt-manganese oxide with the monocrystal structure is uniformly mixed with lithium hydroxide monohydrate in a mortar and the mixture is calcined at a high temperature to obtain a MOF-coated monocrystal ternary positive electrode material. The problems of poor cyclic and thermal stability caused by high nickel content are thus overcome, and the obtained positive electrode material has electrochemical properties of high rate, high capacity, and high cycle performance.
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