Nickel-cobalt lithium aluminate and preparation method of precursor thereof

A nickel-cobalt-aluminate, precursor technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficult to fully exert performance, complex process, poor performance, etc., and achieve compact structure, low price, and low product cost. Effect

Active Publication Date: 2013-11-20
郭建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-phase synthesis generally uses nickel, cobalt, aluminum compounds and lithium source compounds for sintering after mixing, but this solid mixing method cannot achieve uniformity at the atomic level, and the performance is difficult to fully exert; although liquid-phase methods can solve this problem, However, the process is complicated, the performance is poor, and the output is low

Method used

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  • Nickel-cobalt lithium aluminate and preparation method of precursor thereof
  • Nickel-cobalt lithium aluminate and preparation method of precursor thereof
  • Nickel-cobalt lithium aluminate and preparation method of precursor thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 3400g of nickel sulfate and 660g of cobalt sulfate in 8L of deionized water to form salt solution A; add 300g of aluminum nitrate and 300g of EDTA to 4L of deionized water and add sulfuric acid to adjust the pH to 3 to form salt solution B. The total molar ratio of nickel, cobalt, and aluminum ions contained in salt solution A and salt solution B is the same as the molar ratio of nickel-cobalt-aluminum in the nickel-cobalt-aluminate lithium to be prepared, which is 8:1.5:0.5, to ensure The ratio of the formed precursor nickel-cobalt-aluminum is consistent with the ratio of the required nickel-cobalt-lithium aluminate material at any time during the reaction process, and the composition of the material is uniform at any time; the concentration of the prepared 4L is 6M Sodium hydroxide solution, add ammonia water and mix to make the ammonia concentration in the mixed solution be 4M, as strong alkali solution C;

[0024] Add 4L of bottom solution to a 30L reaction...

Embodiment 2

[0028]3400g of nickel sulfate and 390g of cobalt acetate were dissolved in 8L of deionized water to form solution A, 274g of aluminum sulfate and 400g of tartaric acid were dissolved in 4L of deionized water, and sulfuric acid was added to adjust the pH=2 to form a salt solution B. The salt solution A and The total molar ratio of nickel, cobalt, and aluminum ions contained in the salt solution B is the same as the molar ratio of nickel, cobalt, and aluminum in the nickel-cobalt-aluminate lithium to be prepared, which is 8:1:1; prepare 8L of 10M Sodium hydroxide solution, add ammonia water and mix evenly to make the ammonia concentration in the mixed solution 1M, as strong alkali solution C;

[0029] Add 4L of bottom liquid into a 30L reaction kettle, after heating to 50°C, control the flow rate of salt solution A and salt solution B at 0.4L / h, and add salt solution A and salt solution B into the reaction kettle together , at the same time, open the pipeline leading into the st...

Embodiment 3

[0034] Dissolve 3291g of nickel chloride and 770g of cobalt sulfate in 8L of deionized water to form solution A, dissolve 266.7g of aluminum chloride and 1140g of sulfosalicylic acid in 8L of deionized water, add sulfuric acid to adjust the pH to 3, and then form the solution into a salt Solution B, the total molar ratio of nickel, cobalt, and aluminum ions contained in the salt solution A and salt solution B is the same as the molar ratio of nickel-cobalt-aluminum in the nickel-cobalt-aluminate lithium that needs to be prepared, both are 7:1.75 : 1.25; preparation 8L concentration is the sodium hydroxide solution of 2M, after adding ammoniacal liquor and mixing, make the ammonia concentration in the mixed solution be 8M, as strong alkali solution C;

[0035] Add 4L of bottom solution into the 30L reactor, heat it to 50°C, control the flow rate of salt solution A and B at 0.3L / h and add salt solution A and B together, and open the alkali solution at the same time to adjust the ...

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Abstract

The invention relates to a preparation method of a nickel cobalt aluminum material precursor. The method used in the invention comprises the steps: carrying out a complexation reaction of an aluminum salt and a complexing agent to form a stable aluminum complex, then injecting the aluminum complex simultaneously with a nickel-cobalt salt solution into a reaction kettle for carrying out a co-precipitation reaction to prepare a high-density precursor of nickel-cobalt lithium aluminate, and then carrying out a lithium mixed roasting to form a high-density spherical nickel-cobalt lithium aluminate material. At the same time, the invention also discloses an application of the nickel-cobalt lithium aluminate material used in a cathode material of a lithium ion battery. The high-density spherical nickel-cobalt lithium aluminate material which has atomic level mixture of nickel cobalt aluminum elements and good crystallinity can be produced under a premise without mass increase of cost, and the charge and discharge capacity and the first time efficiency have a certain improvement compared with those of current products. The process is simple and easy to implement, and can be used in large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, in particular to a cathode material for high specific capacity lithium ion batteries and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in various mobile appliances, such as mobile phones, cameras, and notebook computers. The demand for lithium-ion secondary batteries with high performance and good safety performance continues to increase. LiNiO 2 The positive electrode material doped with Co element also has LiNiO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle performance of the material. The representative material can be expressed as LiNi 0.8 co 0.2 o 2 , the positive electrode material of this composition has better energy density than the same series of materials. However, this material also has defects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 郭建张联齐史华
Owner 郭建
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