Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material and preparation method and use thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing material cycle stability, reducing coating effect, increasing battery impedance, etc., to improve electrochemical performance, improve Coating effect, effect of reducing impedance

Inactive Publication Date: 2018-07-24
苏州林奈新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 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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  • Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material and preparation method and use thereof
  • Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material and preparation method and use thereof
  • Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material and preparation method and use thereof

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preparation example Construction

[0040] The preparation method of the Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery 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 Ti-doped nickel-cobalt-aluminum ternary lithium-ion battery Cathode material (Li a Ni ...

Embodiment 1

[0050] 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 , 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:

[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, sinter the resultant and the doping material TiO with the step (1) 2 Mixed grinding, the amount of lithium hydroxide monohydrate is 1.035:1 in the molar ratio of Li in lithium hydroxide monohydrate to (Ni+Co+Al) in the precursor of the ternary positive electrode material, TiO 2 The amou...

Embodiment 2

[0056] 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 , 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:

[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, sinter the resultant and the doping material TiO with the step (1) 2 Mixed grinding, the amount of lithium hydroxide monohydrate is 1.035:1 in the molar ratio of Li in lithium hydroxide monohydrate to (Ni+Co+Al) in the precursor of the ternary positive electrode material, TiO 2 The amo...

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Abstract

The invention provides a Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material and a preparation method and use thereof. The material has a chemical formula of (LiaNi1-x-yCoxAly)1-bTibO2, x)0, y)0, 1-x-y)0, wherein 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 0.01. The preparation method comprises sintering a ternary positive electrode material precursor Ni1-x-yCoxAly(OH)2+y, adding a lithium source and a doping material into the sintering product, carrying out sintering and carrying out ternary sintering to obtain a desired product. The Ti-doped nickel-cobalt-aluminum ternary lithium ion battery positive pole material has excellent cycle performances. The preparation method comprises three sintering steps, has simple processes, is easy to control and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a Ti-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 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 positive electrode material of the nickel-cobalt-aluminum ternary lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/525H01M10/0525
CPCH01M4/364H01M4/48H01M4/525H01M10/0525Y02E60/10
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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