Lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as increased manufacturing costs, inapplicability, and poor material performance, and achieve improved fluidity, difficult structure, and internal voids small effect

Active Publication Date: 2018-02-09
PULEAD TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing agglomerated material A and single crystal or single crystal-like material B, one-step heat treatment is adopted, and multiple heat treatments are carried out before and after element coating, which increases the manufacturing cost, and if it is used to prepare lithium nickel cobalt aluminate Positive electrode, repeated heat treatment will make the material performance is not good, this method is not suitable for the preparation of nickel cobalt lithium aluminate positive electrode material

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0029] This embodiment provides a method for preparing a lithium-ion battery positive electrode material, the steps are as follows:

[0030] Ni with a median diameter of about 10 μm 0.815 co 0.15 Al 0.035 (OH) 2 Precursor (that is, nickel-cobalt-aluminum co-precipitation precursor A) and LiOH at a ratio of 1:1.05 (equivalent to the molar ratio of the sum of all metal ions of nickel-cobalt-aluminum co-precipitation precursor A to the lithium ion of LiOH, the same below) Mix evenly, place the mixture in a sintering furnace under an oxygen atmosphere, raise the temperature to 520°C at 5°C / min, keep it for 3 hours, then raise the temperature to 760°C at 1°C / min, keep it for 10 hours, and finally cool naturally to room temperature to obtain a spherical shape Morphology of nickel-cobalt-lithium-aluminate particles.

[0031] Ni with a median diameter of about 3 μm 0.88 co 0.09 Al 0.03 (OH) 2Precursor (that is, nickel-cobalt-aluminum co-precipitation precursor B) and LiOH at a...

Embodiment 2

[0035] This embodiment provides a method for preparing a lithium-ion battery positive electrode material, the steps are as follows:

[0036] Ni with a median diameter of about 12 μm 0.85 co 0.12 al 0.03 (OH) 2 The precursor (i.e. nickel-cobalt-aluminum co-precipitation precursor A) and LiOH were mixed uniformly at a ratio of 1:1.04, and the mixture was placed in a sintering furnace under an oxygen atmosphere, and the temperature was raised to 500 °C at 5 °C / min, kept for 3 h, and then The temperature was raised to 770°C at 1°C / min, kept for 10 hours, and finally cooled to room temperature naturally to obtain spherical nickel-cobalt-lithium aluminate particles.

[0037] Ni with a median diameter of about 5 μm 0.85 co 0.12 al 0.03 (OH) 2 The precursor (i.e. nickel-cobalt-aluminum co-precipitation precursor B) and LiOH were mixed uniformly at a ratio of 1:1.04, and the mixture was placed in a sintering furnace under an oxygen atmosphere, and the temperature was raised to 5...

Embodiment 3

[0041] This embodiment provides a method for preparing a lithium-ion battery positive electrode material, the steps are as follows:

[0042] Ni with a median diameter of about 9 μm 0.88 co 0.09 al 0.03 (OH) 2 The precursor (i.e. nickel-cobalt-aluminum co-precipitation precursor A) and LiOH were mixed uniformly at a ratio of 1:1.10, and the mixture was placed in a sintering furnace under an oxygen atmosphere, and the temperature was raised to 540 °C at 5 °C / min, kept for 3 h, and then The temperature was raised to 780°C at 1°C / min, kept for 10h, and finally cooled to room temperature naturally to obtain spherical nickel-cobalt-lithium aluminate particles.

[0043] Ni with a median diameter of about 5 μm 0.85 co 0.12 al 0.03 (OH) 2 The precursor (i.e. nickel-cobalt-aluminum co-precipitation precursor B) and LiOH were mixed uniformly at a ratio of 1:0.9, and the mixture was placed in a sintering furnace under an oxygen atmosphere, and the temperature was raised to 530 °C a...

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Abstract

The present invention provides a lithium ion battery positive electrode material. The chemical formula of the material is Li<1+n>Ni<0.8+x>Co<0.2-x-y>Al<y>M<z>O<2>, wherein x+y+z<0.2, 0<=x<0.2, 0.01<=y<=0.05, 0.01<=z<=0.05, and -0.1<=n<=0.1; and the M is one kind or several kinds of cobalt, aluminum, magnesium, titanium, zirconium and boron. The lithium ion battery positive electrode material is mixed by single-crystal-shaped nickel cobalt lithium aluminate particles and spherical-shaped nickel cobalt lithium aluminate particles, the median diameter of the spherical-shaped nickel cobalt lithiumaluminate particles is 8-15 [mu]m, and the median diameter of the single-crystal-shaped nickel cobalt lithium aluminate particles is 0.5-6 [mu]m. The present invention also provides a preparation method of the lithium ion battery positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high voltage platform, and low environmental pollution, and are widely used in mobile phones, notebooks, power tools and other fields. The current commercial cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate and lithium nickel cobalt manganese oxide. However, the energy density of lithium-ion batteries made of these cathode materials is low, which is difficult to meet the wide application of lithium-ion batteries. It has been found through research that nickel-cobalt lithium aluminate cathode material has the advantage of high capacity, which can increase the energy density of lithium-ion batteries. [0003] Lithium ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/364H01M4/366H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 王汝娜申兰耀张振宇沈伟周恒辉
Owner PULEAD TECH IND
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