Preparation method of high-voltage lithium ion battery positive electrode material hollow spherical LNMO

A cathode material, lithium nickel manganese oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable large-scale production, low yield of hydrothermal reactors, cumbersome synthesis process, etc., and achieve a good cycle. The effect of stability, favorable contact and rich source of raw materials

Inactive Publication Date: 2017-07-25
HARBIN INST OF TECH AT WEIHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among the many public methods, most of them use hydrothermal reactors to synthesize spherical materials, but the yield of hydrothermal reactors is low, which is not conducive to large-scale production
In the method of preparing precursor materials by co-precipitation, most researchers use hydroxides, organic salts or polymers as precipitants to prepare mixed intermediate precursors. Although the performance of synthetic materials is significantly improved compared with other methods, but The raw materials are complex and the synthesis process is cumbersome, which is not conducive to large-scale production
In addition, there are many preparation methods for spherical lithium nickel manganese oxide, such as CN 103066275, a preparation method of a spherical high voltage lithium nickel manganese oxide positive electrode material. The method requires the use of toxic hydrazine hydrate, and cooling and crushing are required between the two sinterings. The process is relatively cumbersome, and the product is solid spherical or spherical.

Method used

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  • Preparation method of high-voltage lithium ion battery positive electrode material hollow spherical LNMO

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Effect test

Embodiment 1

[0029] A hollow spherical lithium nickel manganese oxide, a positive electrode material for a high-voltage lithium battery. The preparation steps are as follows:

[0030] (1) Evenly disperse 3.375mmol manganese sulfate and 1.125mmol nickel sulfate in a mixture of 30ml absolute ethanol and 60ml deionized water, and stir for 50min to obtain a dispersion of manganese nickel sulfate;

[0031] (2) Disperse 225mmol of ammonium bicarbonate evenly in 60ml of deionized water and stir for 30min to obtain ammonium bicarbonate solution;

[0032] (3) Slowly add the ammonium bicarbonate solution prepared in (2) dropwise into the mixed solution of (1), and continue to stir for 60 minutes to obtain grass-green nickel-manganese carbonate precipitation;

[0033] (4) Suction filter the above precipitate, and repeatedly wash with deionized water and absolute ethanol three times, collect the precipitate, and dry at 60°C for 5 hours;

[0034] (5) Dissolve 2.362mmol lithium hydroxide in deionized w...

Embodiment 2

[0039] A hollow spherical lithium nickel manganese oxide, a positive electrode material for a high-voltage lithium battery. The preparation steps are as follows:

[0040] (1) Same as embodiment 1

[0041] (2) Same as embodiment 1

[0042] (3) Same as embodiment 1

[0043] (4) Same as embodiment 1

[0044] (5) Dissolve 1.181mmol of lithium carbonate in absolute ethanol, stir the dried precipitate and lithium carbonate solution for 30 minutes, then raise the temperature to 50°C and continue stirring until the ethanol is volatilized, and then place it in blast drying Blast drying in the box;

[0045](6) Heat the dried mixture from room temperature to 400°C at a heating rate of 3°C / min, sinter for 3 hours, then increase the temperature at a rate of 3°C / min to 700°C, sinter for 8 hours, and cool to room temperature naturally. Obtain hollow spherical lithium nickel manganese oxide.

[0046] The hollow spherical lithium nickel manganese oxide prepared by the method is used as th...

Embodiment 3

[0048] A hollow spherical lithium nickel manganese oxide, a positive electrode material for a high-voltage lithium battery. The preparation steps are as follows:

[0049] (1) Evenly disperse 2.25mmol manganese sulfate and 0.75mmol nickel sulfate in a mixture of 10ml absolute ethanol and 20ml deionized water, and stir for 40min to obtain a dispersion of manganese nickel sulfate;

[0050] (2) Disperse 15mmol of ammonium bicarbonate evenly in 20ml of deionized water and stir for 30min to obtain ammonium bicarbonate solution;

[0051] (3) Same as embodiment 1;

[0052] (4) Same as embodiment 1;

[0053] (5) Dissolve 1.575 mmol of lithium acetate in deionized water, stir the dried precipitate and lithium acetate solution for 50 minutes, then raise the temperature to 70°C and continue stirring until the water evaporates, and then place it in a blast drying oven carry out blast drying;

[0054] (6) Heat the dried mixture from room temperature to 500°C at a heating rate of 3°C / min,...

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Abstract

The invention relates to a preparation method for high-voltage lithium ion battery positive electrode material hollow spherical LNMO, and belongs to the technical field of a chemical battery. The preparation method comprises the steps of obtaining a hollow spherical Ni-Mn precursor by a co-precipitation method and by taking manganese sulfate hydrate as a manganese source, nickel sulfate hexahydrate as a nickel source and ammonium bicarbonate as a co-precipitation agent, performing stirring and drying after the precursor and a soluble lithium salt solution are mixed, and sintering a mixture to obtain the hollow spherical LNMO positive electrode material with a diameter being 600-2,000 nanometers. The preparation method has the advantages of simple process, environmental friendliness and rich raw material, and is convenient to operate, and mass production is easy.

Description

technical field [0001] The invention relates to a method for preparing a hollow spherical lithium nickel manganese oxide, a positive electrode active material of a lithium ion battery. It belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 It is a spinel-type structure, which is an electrode material developed by partially replacing Mn with Ni on the basis of the research on lithium manganate. As a positive electrode material for lithium-ion batteries, it has a high voltage of 4.7V and three-dimensional lithium ion transmission. The channel, with an energy density of up to 650Wh / kg, has attracted the attention of many researchers and is considered to be one of the most promising and attractive cathode materials in the development of lithium-ion batteries in the future. But LiNi 0.5 mn 1.5 o 4 There are still deficiencies in making positive electrode materials. For example, there is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘海萍郝晶敏毕四富高超
Owner HARBIN INST OF TECH AT WEIHAI
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