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Preparation method of core-shell-structure nickel cobalt lithium aluminate

A technology of nickel cobalt lithium aluminate, core-shell structure, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as difficult to fully exert performance, complex process, poor performance, etc., to improve cycle stability and thermal stability. performance, the process is simple and easy, and the effect of reducing nickel content

Inactive Publication Date: 2015-10-14
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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  • Preparation method of core-shell-structure nickel cobalt lithium aluminate
  • Preparation method of core-shell-structure nickel cobalt lithium aluminate
  • Preparation method of core-shell-structure nickel cobalt lithium aluminate

Examples

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Embodiment 1

[0020] Prepare 8L total molar concentration of 2M nickel-cobalt salt solution A, wherein Ni:Co=9:1, as the salt solution for preparing the core material; prepare 4L total molar concentration of 2M salt containing nickel salt, cobalt salt, aluminum salt Solution B, wherein Ni: Co: Al = 6: 2.5: 1.5 is used as the salt solution for preparing the shell material, and 8 L of sodium hydroxide solution with a concentration of 2 M is prepared, and ammonia water is added to mix evenly so that the ammonia concentration in the mixed solution is 4 M as an alkaline solution C; Prepare 4L of sodium carbonate solution with a concentration of 2M, add ammonia water and mix evenly so that the ammonia concentration in the mixed solution is 4M as alkaline solution D.

[0021] Inject the prepared salt solution A into the reaction kettle with bottom liquid at a constant speed of 0.4L / h, and at the same time, add alkali solution C to adjust the pH value of the solution in the reaction kettle between 1...

Embodiment 2

[0024] Prepare 4L total molar concentration of 2M solution A containing nickel-cobalt-aluminum salt, wherein Ni:Co:Al=9:0.5:0.5, as the salt solution for preparing the core material; prepare 8L total molar concentration of 2M containing nickel salt, cobalt salt , the salt solution B of aluminum salt, wherein Ni: Co: Al=6: 1.25: 2.75 is used as the salt solution for preparing the shell material, prepares 4L of sodium hydroxide solution with a concentration of 2M, adds ammonia water and mixes to make the ammonia concentration in the mixed solution 4M as alkaline solution C; prepare 8L of sodium carbonate solution with a concentration of 2M, add ammonia water and mix well so that the ammonia concentration in the mixed solution is 4M as alkaline solution D.

[0025] Inject the prepared salt solution A into the reaction kettle with bottom liquid at a constant speed of 0.6L / h. At the same time, add alkali solution C to adjust the pH value of the solution in the reaction kettle betwee...

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Abstract

The invention relates to a preparation method of a core-shell-structure nickel cobalt lithium aluminate and belongs to the technical field of lithium ion battery positive material application. The core-shell-structure material is in a two-layer structure, wherein the inner layer core part is LiNiaCo[1-a-b]AlbO2, a is more than 0.7, b is less than or equal to 0.05 and more than or equal to 0, and a+b is less than 1; the molecular formula of the shell part is LiNicCo[1-c-d]AldO2, c is more 0.5, d is more than 0 and less than 0.5, and c+d is less than 1. In the method, two kinds of aqueous alkali are used as precipitators, so that the materials of the core part and the shell part are consistent in crystal from and compact in structure in the crystallization process, and a solubility gradient method is adopted in the alternating process of the two kinds of aqueous alkali so that the core-shell-structure material is consistent in crystal from and high in crystallization degree, and an obvious core-shell interface does not exist. Compared with a common homogeneous phase material, the core-shell-structure material disclosed by the invention has the advantages that the high capacity is kept, the cycling stability and the heat stability are improved, the air expanding rate is obviously reduced, and the cost performance is higher, so that the core-shell-structure material is more suitable for being used in power batteries.

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. At present, NCA material, as a high specific energy material, has been paid more and more attention by domestic and foreign battery manufacturers. The application of this material has also entered the application field of electric vehicle power battery cathode materials from the field of portable batteries. However, this material has a high nickel content. During the charging and discharging process, the high-valent nickel on the surface of the material und...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/485
CPCY02E60/10
Inventor 郭建张联齐
Owner 郭建
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