Doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material as well as preparation method and application

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as reducing material cycle stability, increasing battery impedance, and reducing coating effects, so as to improve electrochemical performance and reduce Impedance, the effect of improving the coating effect

Inactive Publication Date: 2018-08-28
苏州林奈新能源有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the positive electrode material of nickel-cobalt-aluminum ternary lithium-ion battery will have a strong side reaction with the organic electrolyte in a wide voltage range, it will increase the impedance of the battery during charge and discharge, and reduce the cycle stability of the material.
[0003] The free lithium on the surface of the positive electrode material of the nickel-cobalt-aluminum ternary lithium-ion battery, that is, lithium oxide, lithium hydroxide and lithium carbonate is an alkaline substance. The attack of the aggressive substance on the binder in the positive electrode glue will cause the binder to form double bonds, produce glue, cause slurry jelly, reduce the coating effect, and affect the performance of the battery cell

Method used

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  • Doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material as well as preparation method and application
  • Doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material as well as preparation method and application
  • Doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material as well as preparation method and application

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preparation example Construction

[0049] The preparation method of the doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material of the embodiment of the present invention comprises the following steps:

[0050] Step (1), the first sintering: the ternary cathode material precursor Ni 1-x-y co x Al y (OH) 2+y Sintering; sintering time 6-20 hours, sintering temperature 200-1000 ℃;

[0051] Step (2), the second sintering: add the sintered product of the step (1) to the lithium source and the dopant material to mix and grind according to a certain ratio, after the grinding is uniform, sinter in air or oxygen atmosphere, after the sintering is completed, Cool down to room temperature at a cooling rate of 0.01-2.5°C / min;

[0052] Step (3), the third sintering: sintering the sintered product of the step (2), the sintering time is 1-12 hours, the sintering temperature is 500-1000°C, and the positive electrode of the doped nickel-cobalt-aluminum ternary lithium-ion battery is obtained Ma...

Embodiment 1

[0059] What embodiment 1 provides is Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9993 Ti 0.0007 o 2 , M is Ti, x=0.15, y=0.035, a=1.035, b=0.0007. The Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9993 Ti 0.0007 o 2 The preparation method comprises the following steps:

[0060] Step (1), the first sintering: the ternary cathode material precursor Ni 1-x-y co x Al y (OH) 2+y Sintering, heating up to 500°C for 10 hours;

[0061] Step (2), the second sintering: After drying lithium hydroxide monohydrate until the crystal water is completely lost, sinter the resultant and the doping material TiO with the step (1) 2 Mixing and grinding, the amount of lithium hydroxide monohydrate is Li in lithium hydroxide monohydrate and (Ni+Co+Al) in the precursor of the ternary positive electrode material The molar ratio is 1.035: 1, Ti...

Embodiment 2

[0066] What embodiment 2 provides is Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9981 Ti 0.0019 o 2 , M is Ti, x=0.15, y=0.035, a=1.035, b=0.0019. The Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9981 Ti 0.0019 o 2 The preparation method comprises the following steps:

[0067] Step (1), the first sintering: the ternary cathode material precursor Ni 1-x-y co x Al y (OH) 2+y Sintering, heating up to 600°C for 6.5 hours;

[0068] Step (2), the second sintering: After drying lithium hydroxide monohydrate until the crystal water is completely lost, sinter the resultant and the doping material TiO with the step (1) 2 Mixing and grinding, the amount of lithium hydroxide monohydrate is Li in lithium hydroxide monohydrate and (Ni+Co+Al) in the precursor of the ternary positive electrode material The molar ratio is 1.035: 1, T...

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Abstract

The invention provides a doped nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material as well as a preparation method and application. A chemical formula of the material is asfollows: (LiaNi1-x-yCoxAly)1-bMbO2, wherein x is greater than 0 and y is greater than 0; the 1-x-y is greater than 0; the a is greater than or equal to 1 and less than or equal to 1.1; the b is greater than 0 and less than or equal to 0.01. A preparation method of the material comprises the following steps: firstly, sintering a ternary positive electrode material precursor Ni1-x-yCoxAly(OH)2+y; then adding a sintered product into a lithium source and a doping material and sintering; finally, carrying out third-time sintering to obtain a target product. The doped nickel-cobalt-aluminum ternarylithium-ion battery positive electrode material synthesized by the preparation method provided by the invention has good circulating performance. The preparation method provided by the invention comprises three times of sintering steps and has the advantages of simple technology, controllable process and easiness for industrialized mass production.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material, a preparation method and an application. Background technique [0002] Nickel-cobalt-aluminum ternary lithium-ion battery cathode materials have the characteristics of high energy density, good low-temperature performance, good thermal stability, low cost, and low environmental toxicity. It is one of the cathode materials with the most market development prospects in the field of power lithium-ion batteries . However, because the positive electrode material of nickel-cobalt-aluminum ternary lithium-ion battery will have a strong side reaction with the organic electrolyte in a wide voltage range, it will increase the impedance of the battery during charge and discharge, and reduce the cycle stability of the material. [0003] The free lithium on the surface of the positive electrode material of the nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/46H01M10/0525
CPCH01M4/463H01M4/525H01M10/0525Y02E60/10
Inventor 任东方艳于英超沈赟
Owner 苏州林奈新能源有限公司
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