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Lithium nickel cobalt manganate positive electrode material and preparation method thereof

A technology of nickel cobalt lithium manganate and cathode material, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of unable to meet electric vehicles, unable to reach 3000 times, and the preparation technology needs to be improved.

Active Publication Date: 2018-06-15
ZOLTRIX MATERIAL GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The positive electrode material is nickel-cobalt lithium manganate-based positive electrode material LiNi with low nickel content. x co y mn 1-x-y o 2 Such as LiNi 0.5 co 0.2 mn 0.3 o 2 Lithium-ion batteries such as Li-ion batteries, although the cycle life can reach 3000 times, can meet the requirements of the 8-year service life of electric vehicle batteries, but due to LiNi 0.5 co 0.2 mn 0.3 o 2 The 3.0-4.2V gram capacity is only about 160mAh / g, and the 3.0-4.4V gram capacity is only about 180mAh / g. As a result, the energy density of the battery can only reach about 200wh / kg, which cannot meet the requirement of 500km for a single charge of electric vehicles.
[0004] LiNi, a cathode material of nickel-cobalt lithium manganese oxide with high nickel content under development x co y mn 1-x-y o 2 Such as LiNi 0.6 co 0.2 mn 0.2 o 2 、LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.85 co 0.1 Al 0.05 o 2 etc., its 3.0-4.2V gram capacity can reach more than 180mAh / g, and the energy density of lithium-ion batteries using this type of positive electrode material can reach 300wh / kg, which meets the requirements of 500km for a single charge of electric vehicles, but its cycle life is only 2000 times, unable to reach 3000 times
[0005] Therefore, the existing nickel-cobalt lithium manganate cathode material LiNi x co y mn 1-x-y o 2 Preparation technology still needs to be improved

Method used

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  • Lithium nickel cobalt manganate positive electrode material and preparation method thereof
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  • Lithium nickel cobalt manganate positive electrode material and preparation method thereof

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Embodiment 1

[0038] A preparation method of nickel cobalt lithium manganese oxide positive electrode material, comprising the steps of:

[0039]Preparation of Ni by hydrothermal method x co y mn 1-x-y (OH) 2 Seed, where x=0.8, y=0.1:

[0040] Nickel acetate, cobalt acetate and manganese acetate were mixed and dissolved in deionized water at a molar ratio of Ni:Co:Mn of 8:1:1, and then a shape guiding agent (specifically sodium dodecylbenzenesulfonate) was added to obtain Homogeneous solution system, the added amount of the shape guiding agent is 8wt% of the amount of nickel acetate;

[0041] Put the homogeneous solution system in a reaction kettle, keep the temperature at 150°C and 0.4MPa for 10h, then cool to 25°C, and filter to obtain the Ni x co y mn 1-x-y (OH) 2 A seed crystal, the particle size D50 of the seed crystal is 0.5-1.5 μm.

[0042] Co-precipitate the seeds to obtain Ni x co y mn 1-x-y (OH) 2 Prebody:

[0043] Add the seed crystals into the continuous reactor, a...

Embodiment 2

[0051] A preparation method of nickel cobalt lithium manganese oxide positive electrode material, comprising the steps of:

[0052] Preparation of Ni by hydrothermal method x co y mn 1-x-y (OH) 2 Seed, where x=0.8, y=0.1:

[0053] Nickel acetate, cobalt acetate and manganese acetate were mixed and dissolved in deionized water at a molar ratio of Ni:Co:Mn of 8:1:1, and then a shape guiding agent (specifically sodium hexadecylbenzenesulfonate) was added to obtain Homogeneous solution system, the added amount of the shape guiding agent is 10wt% of the amount of nickel acetate;

[0054] Put the homogeneous solution system in a reaction kettle, keep the temperature at 170°C and 0.35MPa for 8 hours, then cool to 30°C, and filter to obtain the Ni x co y mn 1-x-y (OH) 2 A seed crystal, the particle size D50 of the seed crystal is 0.5-1.5 μm.

[0055] Co-precipitate the seeds to obtain Ni x co y mn 1-x-y (OH) 2 Prebody:

[0056] Add the seed crystals into the continuous r...

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Abstract

The invention relates to a lithium nickel cobalt manganate positive electrode material and a preparation method thereof. The preparation method comprises the following steps of preparing seed crystalby adopting a hydrothermal method; performing a coprecipitation reaction on the seed crystal to obtain an Ni<x>Co<y>Mn<1-x-y>(OH)<2>, enabling the precursor to be mixed with lithium hydroxide or lithium carbonate at a molar ratio of Li to (Ni+Co+Mn) of 1:1-1.2, and next, performing sintering treatment on the mixture to obtain an intermediate body; enabling the intermediate body to be mixed with lithium hydroxide, and next, spraying metal sol to obtain a pre-coating material; and performing secondary sintering on the pre-coating material to obtain the lithium nickel cobalt manganate positive electrode material. The lithium nickel cobalt manganate positive electrode material prepared by the preparation method has the monocrystal appearance; and the lithium ion battery adopting the positive electrode material is high in energy density which can reach as high as 300wh / kg, and the cycle life can reach 3,000 times.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a lithium-ion battery nickel-cobalt lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] As a new type of green energy, lithium-ion batteries have the advantages of high specific energy, small self-discharge, no memory effect, long cycle life, and no environmental pollution. They are widely used in mobile phones, notebook computers and other electronic products; at the same time, lithium-ion batteries are also electric Energy storage power supply for automotive power supply and solar renewable energy. [0003] The positive electrode material is nickel-cobalt lithium manganate-based positive electrode material LiNi with low nickel content. x co y mn 1-x-y o 2 Such as LiNi 0.5 co 0.2 mn 0.3 o 2 Lithium-ion batteries such as Li-ion batteries, although the cycle life can reach 3000 times, can meet ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 吴振豪陈步青
Owner ZOLTRIX MATERIAL GUANGZHOU
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