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

A technology of cobalt manganese hydroxyl and nickel oxide, applied in chemical instruments and methods, nickel carbonyl, chemical/physical processes, etc., can solve problems such as polluting the environment, increasing costs, and affecting tap density

Inactive Publication Date: 2007-07-18
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 O

Method used

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

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Experimental program
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Embodiment 1

[0008] (1) Solution preparation, preparation concentration is 4.0mol / dm 3 1000ml of NaOH solution; according to the ratio of Ni:Mn:Co molar ratio of 1:1:1, the concentration is 1.5mol / dm 3 NiSO 4 、CoSO 4 , MnSO 4 Mixed solution 1000ml.

[0009] (2) Put the above-mentioned sodium hydroxide solution into the reactor first, then gradually add the above-mentioned metal mixed salt solution into the reactor under stirring, set the reaction temperature at 50° C., and obtain doped Co, Mn nickel hydroxide paste.

[0010] (3) 100ml of 0.6% polyacrylamide solution was added to the obtained slurry for coagulation, and then the coagulation was press-filtered to form a filter cake.

[0011] (4) The above filter cake was dried at 120° C. for 6 hours, and then washed with water to remove soluble impurity ions.

[0012] (5) After drying for the second time at 120°C, crush and sieve to obtain Ni 1 / 3 co 1 / 3 mn 1 / 3 OOH precursor with a tap density of 2.21g / cm 3 .

Embodiment 2

[0014] (1) Solution preparation, preparation concentration is 6.0mol / dm 3 1000ml of KOH solution; according to the ratio of Ni:Mn:Co molar ratio of 2:2:1, the concentration is 1.5mol / dm 3 NiSO 4 、CoSO 4 , MnSO 4 Mixed solution 1000ml;

[0015] (2) Put the above-mentioned potassium hydroxide solution into the reactor first, then gradually add the above-mentioned metal mixed salt solution into the reactor under stirring, set the reaction temperature at 80° C., and obtain doped Co, Mn nickel hydroxide slurry;

[0016] (3) 120ml of 0.6% polyacrylamide solution is added to the resulting slurry for coagulation, and then the coagulation is press-filtered to form a filter cake;

[0017] (4) drying the above filter cake at 135°C for 4 hours, then washing with water to remove soluble impurity ions;

[0018] (5) After drying for the second time at 100°C, crush and sieve to obtain Ni 2 / 5 co 1 / 5 mn 2 / 5 OOH precursor with a tap density of 2.23g / cm 3 .

Embodiment 3

[0020] (1) Solution preparation, preparation concentration is 2.0mol / dm 3 1500ml of NaOH solution; according to the ratio of Ni:Mn:Co molar ratio of 2:1:2, the concentration is 1.2mol / dm 3 NiCl 2 、CoCl 2 , MnCl 2 Mixed solution 1000ml;

[0021] (2) Put the above-mentioned sodium hydroxide solution into the reactor first, then gradually add the above-mentioned metal mixed salt solution into the reactor under stirring, set the reaction temperature at 30°C, and obtain doped Co, Mn after 2 hours of reaction Nickel hydroxide slurry;

[0022] (3) 200ml of 0.3% polyacrylamide solution is added to the resulting slurry for coagulation, and then the coagulation is press-filtered to form a filter cake;

[0023] (4) The above filter cake was dried at 100° C. for 8 hours, and then washed with water to remove soluble impurity ions.

[0024] (5) After drying for the second time at 80°C, crush and sieve to obtain Ni 2 / 5 co 2 / 5 mn 1 / 5 OOH precursor with a tap density of 2.15g / cm 3

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58C01G53/02B01J19/00H01M4/52
CPCY02E60/10
Inventor 常照荣吴锋汤宏伟陈中军朱志红
Owner HENAN NORMAL UNIV
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