92results about How to "Precise control of stoichiometric ratio" patented technology

The invention relates to a method for preparing a ternary high-nickel positive electrode material by employing a sol-gel self-propagating combustion method. The ternary high-nickel positive electrode material is LiNi<1-x-y>CoxAlyO2 (1-x-y is greater than 0.5, x is smaller than 1 and greater than 0 and y is smaller than 1 and greater than 0). The method comprises the steps of mixing and dissolving a lithium source, a nickel source, a cobalt source and an aluminum source into deionized water, adding glutamic acid and sodium fluoride to obtain a mixed solution; preparing dry gel from the mixed solution; carrying out heating and heat preservation, and carrying out complete self-propagating combustion on the dry gel to generate fluffy powder; and carrying out heat treatment on the powder to prepare lithium nickel cobalt aluminate positive electrode material. Sol-gel self-propagating combustion is carried out to prepare the lithium nickel cobalt aluminate by employing a glutamic acid as water-soluble gel and sodium fluoride as a catalyst. According to the method, the rate capability of the material can be improved, the cycling stability of the material is improved and the first cycling specific discharge capacity reaches 270-320mAh / g; and meanwhile, the requirements on heat treatment equipment can be reduced and the method has a good application prospect.