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Preparation method of lithium ion battery cathode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low energy density per unit volume of batteries, difficulty in ensuring batch stability, uneven distribution, etc., and achieve improved volumetric energy density , Improve batch stability, improve the effect of bulk density

Inactive Publication Date: 2011-05-11
王志勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet present synthetic method mostly is solid phase method (S.-H.Kang, K.Amine, J.Power Source 2003,119-121,150-155.), solution evaporation direct calcination method (S.-T.Myung et al.J.Power Source 2005,146,645-649.) and partial co-precipitation method (B.Zhanget al.J.Power Source 2008,176,325-331.), the formed cathode material has the following disadvantages: (1) Since the synthesis process involves solid-state reactions between three or more salts, elements such as nickel, manganese, and aluminum are not uniformly distributed in the product, and it is difficult to ensure batch stability after large-scale production; (2) ) The products are mostly irregular, fluffy and agglomerated nanoparticles with low packing density, resulting in low energy density per unit volume of the assembled battery

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  • Preparation method of lithium ion battery cathode material
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Examples

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Effect test

Embodiment 1

[0019] The lithium-ion battery cathode material prepared in this example is a three-component cathode material of lithium nickel manganese aluminate, and its chemical formula is LiNi 0.5-x mn 0.5-x al 2x o 2 , where x=0.025, that is, the chemical formula of the prepared lithium nickel manganese aluminum oxide three-component positive electrode material is LiNi 0.475 mn 0.475 al 0.05 o 2 .

[0020] The preparation method is as follows:

[0021] (1) 293.1g nickel nitrate hexahydrate, 170.3g manganese sulfate monohydrate, and 39.8g aluminum nitrate nonahydrate are dissolved in 1060ml water under stirring to form clarified nickel manganese with a total concentration of nickel, manganese and aluminum cations of 2.0mol / L Aluminum mixed solution;

[0022] (2) 276.6g of sodium carbonate is dissolved in 1300ml of water to form a 2.0mol / L clear solution (the excess coefficient of sodium carbonate is 1.2). Under vigorous stirring, slowly add sodium carbonate solution dropwise to ...

Embodiment 2

[0030] The lithium-ion battery cathode material prepared in this example is a three-component cathode material of lithium nickel manganese aluminate, and its chemical formula is LiNi 0.5-x mn 0.5-x al 2x o 2 , where x=0.01, that is, the chemical formula of the prepared lithium nickel manganese aluminum oxide three-component positive electrode material is LiNi 0.49 mn 0.49 al 0.02 o 2 .

[0031] The preparation method is as follows:

[0032] (1) 1366.4g nickel sulfate hexahydrate, 878.6g manganese sulfate monohydrate, and 79.6g aluminum nitrate nonahydrate are dissolved in 5300ml water under stirring to form clarified nickel manganese with a total concentration of nickel, manganese and aluminum cations of 2.0mol / L Aluminum mixed solution;

[0033] (2) 1362.8g of sodium carbonate is dissolved in 6430ml of water to form a 2.0mol / L clear solution (the excess coefficient of sodium carbonate is 1.2), and under vigorous stirring, slowly add sodium carbonate solution dropwise ...

Embodiment 3

[0041] The lithium-ion battery cathode material prepared in this example is a three-component cathode material of lithium nickel manganese aluminate, and its chemical formula is LiNi 0.5-x mn 0.5-x al 2x o 2 , where x=0.075, that is, the chemical formula of the prepared lithium nickel manganese aluminum oxide three-component positive electrode material is LiNi 0.425 mn 0.425 al 0.15 o 2 .

[0042] The preparation method is as follows:

[0043] (1) 1185.1g nickel sulfate hexahydrate, 762.1g manganese sulfate monohydrate, and 597.0g aluminum nitrate nonahydrate are dissolved in 5300ml water under stirring to form clarified nickel manganese with a total concentration of nickel, manganese and aluminum cations of 2.0mol / L Aluminum mixed solution;

[0044] (2) 1450.5g of sodium carbonate is dissolved in 6840ml of water to form a 2.0mol / L clear solution (the excess coefficient of sodium carbonate is 1.2), and under vigorous stirring, slowly add sodium carbonate solution dropw...

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Abstract

The invention discloses a preparation method of a lithium ion battery cathode material, belonging to the technical field of preparation of lithium ion battery cathode materials. The lithium ion battery cathode material is a nickel manganese lithium aluminate three-component cathode material and has the chemical formula of LiNi0.5-xMn0.5-xAl2xO2, wherein x=0.01-0.075. The three components of nickel, manganese and aluminum are precipitated at the same time by using a complete coprecipitation method so that the three elements are evenly mixed on the molecular level, and the solid-phase reaction is performed on the three elements and lithium salt, thereby the uniform degree of a product is greatly improved; spherical nickel manganese lithium aluminate particles are prepared by using mechanical ball milling and spray pelleting technologies, thereby the stacking density of the materials is improved and the volume energy density of the battery is further increased. Besides, the method realizes that a nickel manganese aluminum precursor is fully mixed with the lithium salt, therefore, the batch stability of the products is improved and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of positive electrode materials of lithium ion batteries. Background technique [0002] With the continuous improvement of requirements for environmental protection and sustainable development in countries around the world, the electric vehicle industry is showing a trend of vigorous development. The core components of lithium-ion batteries include positive electrode materials, negative electrode materials, separators and electrolytes. Among them, the positive electrode material has a decisive impact on the performance of lithium-ion batteries, accounting for more than 40% of the battery cost. Therefore, cathode materials have become the focus of research and attention in various countries in the world. Due to its high power density, low cost, safety and environmental protection, lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/10
Inventor 王志勇
Owner 王志勇
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