Nickel oxide mixed with cobalt manganese hydroxy base and preparation method thereof

Abstract

This invention discloses a nickel-oxhydroxide doped with cobalt-manganese and its preparation method, relating to a nickel compound, from which, the product prepared has high tap density. The technique program is the formula of Ni1-x-yCoxMnyOOH, in which, 1 / 5<=x<=2 / 5, 1 / 5<=y<=2 / 5. Its preparation method includes the following steps: (1) the mixed salt solution is prepared by Ni, Mn and Co, which molar ratio is 1:(1 / 5<=x<=2 / 5) :(1 / 5<=y<=2 / 5), and sodium hydroxide or potassium hydroxide solution is prepared, (2) precipitation reaction, (3) polyacrylamide is accessed into the above slurry for poly deposition, (4) the filter cake is washed, dried, crushed and sift out to get the product. This invention is used for the anode material of lithium battery.

Description

Technical field: [0001] The invention belongs to a nickel compound, in particular to a cobalt-manganese-doped nickel oxyhydroxide and a preparation method thereof. Background technique: [0002] At present, the cathode material of lithium-ion batteries on the market is mainly LiCoO 2 , but cobalt resources are very scarce, expensive and slightly toxic to the environment, so looking for cheap, environmentally friendly and high-performance alternative materials is currently a very active research field. Among them, LiNiO is considered to be the most competitive alternative material 2 and LiMn 2 o 4 Each has fatal flaws. LiMn 2 o 4 The resource is abundant, the cost is low, and the environment is friendly, but the cycle performance is poor, especially the problem of fast capacity fading at high temperature has not been effectively solved. LiNiO 2 Although the positive electrode material is low in price, high in reversible capacity, and wide in the electrochemical window...

AI Technical Summary

Problems solved by technology

At present, most of the precursors of lithium ion cathode materials reported in domestic and foreign literature are prepared by co-precipitation reaction of nickel, cobalt, manganese salt and sodium hydroxide, filtered, washed with water and dried. The tap density of the obtained product is low, which directly affects the lithium ion Cathode material LiNi 1-x-y co x mn y o 2 tap density

The CN1767236 patent publication reports a method for synthesizing a lithium ion positive electrode material from a Co-Ni-Mn-LDHs double hydroxyhydroxide precursor, but the preparation of the precursor requires the addition of H 2 o 2 Oxidation, the crystallization time is as long as 10 to 20 hours, its structure is d-Co-Ni-Mn-LDHs double hydroxide hydroxide, the tap density is very low

U.S. patent application (US2005 / 0089756A1) discloses a continuous process to produce high-density Ni 1-x-y co x mn y (OH) 2 method, but its tap density is only between 1.5-1.91g / cm3, and ammonia water is used as a complexing agent in the production process, which not only increases the cost but also pollutes the environment. In addition, in order to increase the density, an inert gas protection or Use hydrazine hydrate to make the valence state of each metal ion divalent

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