MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material, preparation method and application

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as increasing battery impedance, reducing material cycle stability, etc., to improve structural stability, improve electrochemical performance, easy to use The effect of industrial mass production

Inactive Publication Date: 2018-09-04
苏州林奈新能源有限公司 +1
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  • Summary
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  • Description
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  • 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.

Method used

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  • MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material, preparation method and application
  • MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material, preparation method and application
  • MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material, preparation method and application

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preparation example Construction

[0030] The preparation method of the MgO-coated nickel-cobalt-aluminum ternary lithium-ion battery positive electrode material of the embodiment of the present invention comprises the following steps:

[0031] Step (1), the first sintering: the ternary cathode material precursor Ni 1-x-y co x Mg y (OH) 2+y Sintering; sintering time 6-20 hours, sintering temperature 200-1000 ℃;

[0032] Step (2), the second sintering: Add the sintered product of the step (1) to the lithium source, the molar ratio of Li to the (Ni+Co+Al) in the ternary positive electrode material precursor is a, mix and grind, and grind evenly Finally, sintering is carried out in air or oxygen atmosphere, the sintering time is 8-24 hours, the sintering temperature is 500-1000°C, after the sintering is completed, the cooling rate is 0.01-2.5°C / min to room temperature; the cooling rate is preferably 0.02-1°C / min.

[0033] Step (3), the third sintering: adding the sintered product of the step (2) to the cladd...

Embodiment 1

[0039] What this embodiment provides is the positive electrode material of the nickel-cobalt-aluminum ternary lithium-ion battery coated with MgO, and the chemical formula is (Li 1.035 Ni 0.815 co 0.15 al 0.035 ) 0.9922 Mg 0.0078 o 2 , M is Mg, x=0.15, y=0.035, a=1.035, b=0.0078

[0040] The nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 al 0.035 ) 0.9922 Mg 0.0078 o 2 The preparation method 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, heating up to 500°C for 10 hours;

[0042] Step (2), the second sintering: after drying the lithium hydroxide monohydrate until the crystal water is completely lost, mix it with the sintered product of the step (1), and the amount of lithium hydroxide monohydrate is lithium hydroxide monohydrate The molar ratio of Li in the material to (Ni+Co+Al) in the precursor of the ternary ...

Embodiment 2

[0046] What this embodiment provides is the positive electrode material of the nickel-cobalt-aluminum ternary lithium-ion battery coated with MgO, and the chemical formula is (Li 1.035 Ni 0.815 co 0.15 al 0.035 ) 0.9983 Mg 0.0017 o 2 , M is Mg, x=0.15, y=0.035, a=1.035, b=0.0017.

[0047] The nickel-cobalt-aluminum ternary lithium-ion battery cathode 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:

[0048] 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;

[0049] Step (2), the second sintering: after drying the lithium hydroxide monohydrate until the crystal water is completely lost, mix it with the sintered product of the step (1), and the amount of lithium hydroxide monohydrate is lithium hydroxide monohydrate The molar ratio of Li and (Ni+Co+Al) in the precursor of the ternary cathode mater...

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Abstract

The invention provides an MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material which comprises a lithium nickel-and-cobalt aluminate material and MgO covering the surfaceof the lithium nickel-and-cobalt aluminate material, wherein a chemical formula of the MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material is shown in a formula (I): (LiaNi(1-x-y)CoxMgy)(1-b)MgbO2, wherein x is greater than 0, y is greater than 0, 1-x-y is greater than 0, a is greater than or equal to 1 and less than or equal to 1.1, and b is greater than 0 and less than or equal to 0.02. The preparation method of the material comprises the steps of sintering a ternary anode material precursor Ni(1-x-y)CoxMgy(OH)(2+y), then adding a lithium source into a substanceobtained by sintering for sintering, and finally adding a coating material MgO for sintering, thus obtaining a target product. The MgO coated-nickel, cobalt and aluminum ternary lithium ion battery anode material synthesized by the preparation method is excellent in cycle performance.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a MgO-coated nickel-cobalt-aluminum ternary lithium-ion battery cathode 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. Therefore, how to improve the cycle stability of nickel-cobalt-aluminum ternary materials has become one of the urgent problems to be solved in the industry. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 沈赟方艳于英超任东
Owner 苏州林奈新能源有限公司
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