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Preparation method of high compaction density lithium ion cathode material

A cathode material, lithium ion technology, applied in the field of battery cathode material preparation, can solve the problems of easy particle agglomeration, complicated mixing process, difficult operation control, etc., to achieve optimization of sintering process, good processing performance, and improved compaction density Effect

Active Publication Date: 2016-03-02
CHANGSHA RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the Chinese patent application publication CN101847722A, the compaction density of the material is improved by grinding the micron precursor into a nanoscale, and then sintering at a high temperature to increase the compaction density of the material; but the particles prepared by this method are prone to agglomeration, and the operation is not easy to control
However, the mixing process of this method is more complicated, and the introduction of organic additives not only increases the cost, but also has certain hidden dangers
In the Chinese patent application publication CN102593442A, trace elements are mixed in the precursor and lithium salt mixing process, and then a high-energy-density positive electrode material is obtained through high-temperature sintering. into the body
And although the maximum compacted density of the material can reach 3.85g / cm3, its 1C discharge specific capacity is only 140mAh / g

Method used

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Effect test

Embodiment 1

[0033] A preparation method of a high compacted density lithium-ion battery cathode material of the present invention, comprising the following steps:

[0034] (1) Pretreatment of precursor: mix boric acid with absolute ethanol to form a transparent and clear boric acid-ethanol solution, and add precursor powder Ni 0.5 co 0.2 mn 0.3 (OH) 2 , to form a suspension, and continue to stir for 1 hour, then put in a water bath at 70° C., and continue to stir until the absolute ethanol evaporates to dryness, and then dry to obtain a pretreated precursor. In the suspension, boric acid accounts for 0.5 wt.% of the total mass of the precursor and boric acid, and the mass ratio of the precursor to ethanol is 1:0.5.

[0035] (2) Ingredients: the pre-treated precursor and lithium carbonate obtained in step (1) are placed in a mixer and mixed evenly, and the Li:(Ni 0.5 co 0.2 mn 0.3 ) The mol ratio is 1.08, obtains mixture.

[0036] (3) Sintering: Divide the mixture obtained in step (2)...

Embodiment 2

[0045] A preparation method of a high compacted density lithium-ion battery cathode material of the present invention, comprising the following steps:

[0046] (1) Pretreatment of precursor: mix boric acid with absolute ethanol to form a transparent and clear boric acid-ethanol solution, and add precursor powder Ni 0.5 co 0.2 mn 0.25 Mg 0.05 CO 3 , form a suspension, and keep stirring for 1 hour, then place it in a water bath at 70°C, and keep stirring until the solvent is evaporated to dryness and dried to obtain a pretreated precursor. In the suspension, boric acid accounts for 0.5 wt.% of the total mass of the precursor and boric acid, and the mass ratio of the precursor to ethanol is 1:0.5.

[0047] (2) Ingredients: the pretreated precursor and lithium carbonate obtained in step (1) are placed in a mixer and mixed evenly, and the Li:(Ni 0.5 co 0.2 mn 0.25 Mg 0.05 ) The mol ratio is 1.08, obtains mixture.

[0048] (3) Sintering: The mixture obtained in step (2) is ...

Embodiment 3

[0051] A preparation method of a high compacted density lithium-ion battery cathode material of the present invention, comprising the following steps:

[0052] (1) Pretreatment of precursors: miscible boric acid and deionized water to form a transparent and clear boric acid-water solution, and add ternary precursor powder Ni during the stirring process 0.6 co 0.2 mn 0.2 (OH) 2 , form a suspension, and keep stirring for 1 hour, then place it on an electric furnace, continue stirring until the water is evaporated to dryness, and then dry it to obtain a pretreated ternary precursor material. In the suspension, the percentage of boric acid to the total mass of the ternary precursor material and boric acid is 0.5 wt.%, and the mass ratio of the precursor to water is 1:0.5.

[0053] (2) Ingredients: the pretreated ternary precursor and lithium carbonate obtained in step (1) are placed in a mixer and mixed evenly, and the Li:(Ni 0.6 co 0.2 mn 0.2 ) The mol ratio is 1.10, obtain...

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Abstract

The invention relates to a preparation method of a high compaction density lithium ion cathode material. The preparation method comprises the following steps: (1) uniformly mixing a boron compound with a precursor material to obtain a pretreated precursor material; (2) sufficiently mixing the pretreated precursor material with a lithium salt to obtain a mixture; and (3) carrying out solid phase sintering on the mixture in an oxidizing atmosphere, cooling and crushing to obtain the high compaction density lithium ion cathode material. According to the preparation method, the precursor material is pretreated, the boron compound is firstly uniformly attached to the precursor, and then the pretreated precursor material is mixed with the lithium salt for sintering, so that doped element boron is uniformly distributed in a product phase so as to achieve the purpose of uniform doping. According to the high compaction density lithium ion cathode material prepared by the invention, the tap density is greater than or equal to 2.3 g / cm<3>, the manufacturing compaction density is greater than or equal to 3.70 g / cm<3>, the primary discharge gram capacity can reach more than 153 mAh / g, and the circulating capacity retention rate in 300 circles reaches more than 85%.

Description

technical field [0001] The invention relates to a preparation method of a battery positive electrode material, in particular to a preparation method of a high compacted density lithium ion positive electrode material. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, good safety performance, etc., and are widely used in electronic consumption products, electric vehicles and energy storage. [0003] In recent years, with the rapid development of mobile phones and notebooks, various digital products using lithium-ion batteries have been updated and upgraded very quickly, and most of the products tend to be portable and economical; at the same time, in order to protect the ecological environment and ensure national energy security The strategic needs , Electric vehicles have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M10/0525
CPCH01M4/362H01M4/38H01M4/485H01M4/58H01M10/0525Y02E60/10
Inventor 郭忻黄承焕周耀周友元龚诚李厦胡柳泉习小明
Owner CHANGSHA RES INST OF MINING & METALLURGY
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