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A tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-aluminum technology, applied in the field of tungsten-thallium co-doped nickel-cobalt-aluminum ternary cathode material and its preparation field, can solve problems such as poor rate performance, achieve improved rate performance, accelerate lithium ion conduction, and be beneficial to full soaking effect

Active Publication Date: 2022-03-15
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and its preparation method to solve the technical problem of poor rate performance of existing nickel-cobalt-aluminum ternary positive electrode materials in the prior art

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  • A tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof
  • A tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof
  • A tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof

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preparation example Construction

[0018] The first aspect of the present invention provides a method for preparing a tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material, comprising the following steps:

[0019] S1: Dissolving soluble nickel salt, soluble cobalt salt and soluble aluminum salt in water according to the metal molar ratio to obtain solution A;

[0020] S2: adding the soluble thallium source to the above solution A and mixing evenly to obtain solution B; the molar mass of thallium is 0.03%-0.05% of the total molar mass of nickel, cobalt and aluminum ions;

[0021] S3: add lye and complexing agent into solution B in parallel, control the pH to 10-12, keep warm for reaction, and then undergo solid-liquid separation, water washing, and drying to obtain a thallium-doped nickel-cobalt-aluminum precursor;

[0022] S4: Dissolve lithium hydroxide in water, add tungsten source and mix evenly, then add thallium-doped nickel-cobalt-aluminum precursor, mix evenly to obtain slu...

Embodiment 1

[0034] (1) According to the metal molar ratio n Ni :n Co :n Al =88:9:3 take nickel sulfate, cobalt sulfate and sodium aluminate and be mixed with the solution A that the sum of metal ion concentration is 1.8mol / L;

[0035] (2) Thallous sulfate is added in solution A to dissolve to obtain solution B; wherein the molar weight of thallium is 0.05% of the total molar weight of nickel, cobalt and aluminum ions;

[0036] (3) Pass solution B into the reactor, then feed 4.0mol / L sodium hydroxide solution into the reactor at a flow rate of 30L / h to control the pH of the system to be 10.5 to 11.5; then feed it at a flow rate of 25L / h 0.5mol / L sodium citrate, keep the temperature in the reactor at 60°C, react under the protection of nitrogen atmosphere for 26h, and then obtain the thallium-doped nickel-cobalt-aluminum precursor by solid-liquid separation, washing and drying; during the reaction, It is necessary to continuously feed sodium hydroxide solution to control the pH of the sy...

Embodiment 2

[0040] (1) According to the metal molar ratio n Ni :n Co :n Al =85:10:5 take nickel sulfate, cobalt sulfate and sodium aluminate and be mixed with the solution A that the sum of metal ion concentration is 1.5mol / L;

[0041] (2) Thallous sulfate is added in solution A to dissolve to obtain solution B; wherein the molar weight of thallium is 0.03% of the total molar weight of nickel, cobalt and aluminum ions;

[0042] (3) Pass solution B into the reactor, then feed 10mol / L sodium hydroxide solution into the reactor at a flow rate of 20L / h to control the pH of the system to be 11-12; then feed 0.4 at a flow rate of 20L / h mol / L sodium citrate, keeping the temperature in the reactor at 50°C, reacting for 30 hours under the protection of nitrogen atmosphere, and obtaining the precursor of thallium-doped nickel-cobalt-aluminum through solid-liquid separation, washing and drying; during the reaction process, Continuously feed sodium hydroxide solution to control the pH of the syste...

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Abstract

The invention discloses a method for preparing a tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material. The soluble thallium source is added into solution A and mixed evenly to obtain solution B; the lye solution and complexing agent are added into solution B in parallel, the pH is controlled to be 10-12, the reaction is kept warm, followed by solid-liquid separation, washing and drying to obtain thallium Doping nickel-cobalt-aluminum precursor; dissolving lithium hydroxide in water, adding tungsten source and mixing uniformly, then adding thallium-doped nickel-cobalt-aluminum precursor, mixing uniformly to obtain slurry C, and then evaporating and crystallizing to obtain a crystalline product; The crystalline product is sintered to obtain a ternary positive electrode material co-doped with tungsten and thallium of nickel, cobalt, and aluminum. The invention improves the rate performance of the material by doping thallium and tungsten into the nickel-cobalt-aluminum positive electrode material to refine the primary particles of the positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a tungsten-thallium co-doped nickel-cobalt-aluminum ternary positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-aluminum-lithium ternary lithium-ion battery cathode material has become a very promising ternary cathode material because of its high theoretical specific capacity, good stability, and environmental friendliness. However, due to the high nickel content, it is more likely to cause cation mixing, phase transition leads to a decrease in thermal stability, and the surface of the material has high reactivity and is easy to generate cracks on the surface of the material, resulting in a decrease in the rate performance of the material, which seriously restricts its performance. commercial application. [0003] Therefore, how to improve the rate performance of nickel-cobalt-aluminum-lithium ternary lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 许开华刘德宠徐世国周晓燕施杨李伟
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD