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Mg-Doped nickel-cobalt-aluminum ternary cathode material and preparation method and application thereof

A technology for positive electrode materials and doped materials, applied in the field of preparation of Mg-doped nickel-cobalt-aluminum ternary positive electrode materials, can solve the problems of reducing material cycle stability, reducing coating effect, affecting battery performance, etc., and achieving improvement Electrochemical performance, improvement of coating effect, and effect of stable cycle performance

Inactive Publication Date: 2018-08-17
苏州林奈新能源有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the nickel-cobalt-aluminum ternary material 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 nickel-cobalt-aluminum ternary positive electrode material, that is, lithium oxide, lithium hydroxide and lithium carbonate, is an alkaline substance. The attack of the binder in the middle causes the binder to form double bonds, resulting in glue, causing slurry jelly, reducing the coating effect, and affecting the performance of the battery cell

Method used

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  • Mg-Doped nickel-cobalt-aluminum ternary cathode material and preparation method and application thereof
  • Mg-Doped nickel-cobalt-aluminum ternary cathode material and preparation method and application thereof
  • Mg-Doped nickel-cobalt-aluminum ternary cathode material and preparation method and application thereof

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preparation example Construction

[0040] The preparation method of the Mg-doped nickel-cobalt-aluminum ternary positive electrode material of the embodiment of the present invention comprises the following steps:

[0041] 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 ℃;

[0042] 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;

[0043] Step (3), the third sintering: sintering the sintered product of the step (2), the sintering time is 1-12 hours, and the sintering temperature is 500-1000° C. to obtain a Mg-doped nickel-cobalt-aluminum ternary positive electrode material ( Li a Ni 1-x-y co x Al y ) 1-b ...

Embodiment 1

[0050] What embodiment 1 provides is the nickel-cobalt-aluminum ternary cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9983 Mg 0.0017 o 2 , x=0.15, y=0.035, a=1.035, b=0.0017. This embodiment provides Mg-doped nickel-cobalt-aluminum ternary positive electrode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9983 Mg 0.0017 o 2 The preparation method comprises the following steps:

[0051] 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;

[0052] Step (2), the second sintering: After drying lithium hydroxide monohydrate until the crystal water is completely lost, it is mixed and ground with the sintered product of the step (1) and the doping material MgO. The amount of lithium hydroxide monohydrate The molar ratio of Li in lithium hydroxide monohydrate to (Ni+Co+Al) in the precursor of the ternary positive electrode material is 1.035:1, and the amount of MgO ...

Embodiment 2

[0056] Embodiment 2 provides Mg-doped nickel-cobalt-aluminum ternary positive electrode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9975 Mg 0.0025 o 2 , x=0.15, y=0.035, a=1.035, b=0.0025. The Mg-doped nickel-cobalt-aluminum ternary positive electrode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9975 Mg 0.0025 o 2 The preparation method comprises the following steps:

[0057] 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;

[0058] Step (2), the second sintering: After drying lithium hydroxide monohydrate until the crystal water is completely lost, it is mixed and ground with the sintered product of the step (1) and the doping material MgO. The amount of lithium hydroxide monohydrate The molar ratio of Li in lithium hydroxide monohydrate to (Ni+Co+Al) in the precursor of the ternary positive electrode material is 1.035:1, and the amount of MgO added is Mg ...

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Abstract

The invention provides a Mg-doped nickel-cobalt-aluminum ternary cathode material and a preparation method and application thereof. The Mg-doped nickel-cobalt-aluminum ternary cathode material has thechemical formula of (LiaNi1-x-yCoxAly)1-bMgbO2, with y>0, 1-x-y>0, 1< / =a< / =1.1, and 0<b< / =0.01. The preparation method comprises: sintering a ternary cathode material precursor Ni1-x-yCoxAly(OH)2+y;adding a lithium source and a doping material into the sintering resultant, and carrying out sintering; performing tertiary sintering to obtain the target product. The Mg-doped nickel-cobalt-aluminumternary cathode material prepared herein has good cycle performance. The preparation method having the triple sintering steps has simple technicality and controllable process and facilitates industrial large-scale production.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a Mg-doped nickel-cobalt-aluminum ternary positive electrode material, a preparation method and an application. Background technique [0002] Nickel-cobalt-aluminum ternary 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 most promising cathode materials in the field of power lithium-ion batteries. However, because the nickel-cobalt-aluminum ternary material 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 nickel-cobalt-aluminum ternary positive electrode material, that is, lithium oxide, lithium hydroxide and lithium carbonate, is an alkal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/46H01M4/525H01M10/0525
CPCH01M4/364H01M4/466H01M4/525H01M10/0525Y02E60/10
Inventor 任东沈赟于英超方艳
Owner 苏州林奈新能源有限公司
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