Tatung Company

Wen-Jen Liu

She-Huang Wu

Yung-Jen Lin

Mu-Rong Yang

Yi-Shiuan Chen

ChihWei Yang

A method for preparing LiNiCoOcathode materials is disclosed, wherein &#x2212;0.2&#x2266;x&#x2266;0.2 and 0.05&#x2266;y&#x2266;0.5. The method includes the following steps: (A) adding a first solution into a second solution to form a mixed solution, wherein the first solution is a saturated lithium hydroxide solution, the second solution contains nickel salt and cobalt salt, the mole ratio of the lithium ion in the first solution to nickel ion and cobalt ion in the second solution ranges from 1.5:1 to 5:1, and the molar ratio of nickel ion to cobalt ion in the second solution is 1&#x2212;y:y; (B) stirring the mixed solution; (C) filtering the mixed solution and obtaining a co-precipitated precursor, wherein the molar ratio of lithium ion:nickel ion:cobalt ion is 1+x:1&#x2212;y:y; and (D) heating the co-precipitated precursor at a temperature higher than 600&#xb0; C.

[object Object]

A method for producing a positive electrode material adapted to the Li-ion secondary batteries is disclosed. The produced material has the following formula (I),LiMnMO&#x2003;&#x2003;(I)wherein M is Mg, Al, Cr, Fe, Co, or Ni; 0&#x2266;x&#x2266;0.4, and 0&#x2266;y&#x2266;0.2. The method is achieved by co-precipitating a gel salts with an organic acid. First, salts of Li, Mn and M are mixed with at least a solvent to form an initial solution. The mole ratio of Li, Mn and M ions in their respective salts is (1+x):(2&#x2212;y):y. Next, at least a chelate is added into the initial solution to form a suspension, which is then filtered to obtain a co-precipitate. Finally, the co-precipitate is calcined and heated to obtain the final product.

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Taipei, Taiwan

Wen-Jen Liu