Al-doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material as well as preparation method and purpose thereof

A technology for lithium-ion batteries and positive electrode 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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  • Summary
  • 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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  • Al-doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material as well as preparation method and purpose thereof
  • Al-doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material as well as preparation method and purpose thereof
  • Al-doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material as well as preparation method and purpose thereof

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Embodiment 1

[0051] What embodiment 1 provides is the positive electrode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9984 Al 0.0016 o 2 , M is Al, x=0.15, y=0.035, a=1.035, b=0.016. This embodiment provides Al-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.9984 Al 0.0016 o 2 The preparation method comprises the following steps:

[0052] 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;

[0053] Step (2), the second sintering: after drying lithium hydroxide monohydrate until the crystal water is completely lost, sinter the resultant and the doping material Al with the step (1) 2 o 3 Mixed grinding, the amount of lithium hydroxide monohydrate is Li in lithium hydroxide monohydrate and the (Ni+Co+Al) molar ratio in the precursor of the ternary positive electrode material is 1.035:1, Al 2 o 3 The amount added i...

Embodiment 2

[0058] What embodiment 2 provides is the anode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.997 Al 0.003 o 2 , M is Al, x=0.15, y=0.035, a=1.035, b=0.003. The Al-doped nickel-cobalt-aluminum ternary lithium-ion battery cathode material (Li 1.035 Ni 0.815 co 0.15 Al 0.035 ) 0.997 Al 0.003 o 2 The preparation method comprises the following steps:

[0059] 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;

[0060] Step (2), the second sintering: after drying lithium hydroxide monohydrate until the crystal water is completely lost, sinter the resultant and the doping material Al with the step (1) 2 o 3 Mixed grinding, the amount of lithium hydroxide monohydrate is Li in lithium hydroxide monohydrate and the (Ni+Co+Al) molar ratio in the precursor of the ternary positive electrode material is 1.035:1, Al 2 o 3 The amount added is Al 2 o 3 The molar ratio of Al in...

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Abstract

The invention provides an Al-doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material as well as a preparation method and a purpose thereof. The material has a chemical formula of (LiaNi1-x-yCoxAly)1-bAlbO2, wherein the x is greater than 0; the y is greater than 0; 1-x-y is greater than 0; the a is greater than or equal to 1 but smaller than or equal to 1.1; the b is greater than 0 but smaller than or equal to 0.01. According to the preparation method of the material, firstly, a three-ingredient positive electrode material precursor Ni1-x-yCoxAly(OH)2+y is sintered; then, a lithium source and doping materials are added into the obtained materials after the sintering; sintering is performed; finally, the third time sintering is performed; target products are obtained. The doping nickel-cobalt-aluminum ternary lithium ion battery positive electrode material synthesized by the preparation method has excellent circulation performance. The preparation method comprises three times sintering steps; the process is simple; the process is controllable; the industrial mass production is easy.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to an Al-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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
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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