A kind of composite oxide electrode material and preparation method thereof

A composite oxide, electrode material technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of electrode processing performance to be improved, uneven particle size of solid-phase materials, inability to achieve technical performance, etc., and achieve spherical particle size. Adjustable distribution, good multi-level distribution, and excellent electrochemical performance

Active Publication Date: 2021-11-26
SHENZHEN JANAENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solid-phase method is simple to operate and has low requirements for equipment, this method is only a simple mixing of multi-component materials, and it cannot be truly uniformly distributed at the molecular or nanometer level. Some systems with high requirements for uniform mixing of multi-component metal elements (such as ternary oxide materials, lithium-rich materials, etc.), the technical performance requirements cannot be met, and the particle size of the material obtained by the solid-state method is uneven, and the electrode processing performance needs to be improved.

Method used

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  • A kind of composite oxide electrode material and preparation method thereof
  • A kind of composite oxide electrode material and preparation method thereof
  • A kind of composite oxide electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0035] Formula composite positive electrode material of the present embodiment is Li 1.2 Ni 0.13 CO 0.13 Mn 0.54 O 2 (0.5LiNi 1 / 3 CO 1 / 3 Mn 1 / 3 O 2 · 0.5Li 2 Mno 3 ), Was prepared following steps:

[0036] Molar ratio of Ni: Co: Mn = 0.13: 0.13: 0.54 was weighed nickel oxalate, cobalt oxalate, manganese oxalate, ball mill jar was added with stirring, a certain amount of deionized water was added, the solid content of the slurry is 30%, stirring ball mill 1h. And a molar ratio of Li: (Ni + Co + Mn) = 1.5, lithium hydroxide were weighed and slowly added to the slurry, stirring was continued for milling 5h, to obtain a semi-solid phase slurry.

[0037] The slurry was aged for 12h, and then dried by a spray drier, the powder was collected and dried. The dried powder was placed in a muffle furnace, 900 ℃ calcined 12h. After cooling to obtain a desired material.

[0038] To test whether the material for our present target material, the material is a powder X-ray diffraction test resul...

Embodiment 2

[0044] Formula composite positive electrode material of the present embodiment is LiNi 0.5 CO 0.2 Mn 0.3 O 2 Preparation steps are as follows:

[0045] Said nickel-stoichiometric taking nitrate, cobalt nitrate, manganese acetate, ball mill jar was added, a certain amount of N- methylpyrrolidone, milling 1h. Stoichiometric lithium oxide was then added, continue milling 5h.

[0046] The precursor slurry is aged for 15H, and then dried by a spray dryer, the dried powder was placed in a muffle furnace, calcining deg.] C 15H 850, into the air during firing. After cooling to obtain the desired product.

[0047] The material under a scanning electron microscope image, such as image 3 , The particles are spherical, particle size range of about 3-30um, such a large ball and the ball multistage mixing spherical particles have higher tap density. The tap density of the material was 2.71g / cm 3 , Higher than the commercially available positive electrode material LiNi 0.5 CO 0.2 Mn 0.3 O 2 Th...

Embodiment 3

[0050] Formula composite positive electrode material of the present embodiment is LiNi 0.8 CO 0.1 Mn 0.1 O 2 Preparation steps are as follows:

[0051] Stoichiometrically weighed nickel carbonate, cobalt carbonate, manganese oxalate, ball mill jar was added, deionized water, adjusted to a solids content of 25%, milling 1h. Stoichiometric lithium hydroxide was then added, continue milling 5h, to obtain a precursor slurry.

[0052] The precursor slurry is aged for 24h, and then dried by a spray drier, the powder was collected and dried. The dried powder was put into an atmosphere furnace, 750 ℃ ​​calcined 12h, oxygen was calcined. After cooling to obtain the desired product.

[0053] The tap density of the material is 2.8g / cm 3 In the voltage range 2.5-4.3V, 20mA / g current density, discharge capacity of the first week 190.5mAh / g.

[0054] The material is an X-ray energy spectrum as shown in 5, Ni, Co, Mn distribution element.

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Abstract

The invention relates to a composite oxide electrode material and a preparation method thereof. Its chemical formula A x m y o 2 , 0.4≤x≤1.5, 0.6≤y≤1, A is Li or Na, M is transition metal, said transition metal is two or more, the total doping amount of transition metal is y, in the composite oxide electrode material Each metal element is evenly distributed and has a graded spherical structure. The present invention uses the mechanical force-assisted semi-solid phase chemical method, that is, under the action of mechanical force, with the help of some solvent media, and the slow reaction between the raw materials, while mixing uniformly, the precursor slurry with uniform distribution of various elements is obtained. , and then the slurry is spray-dried to obtain multi-level spherical particles, and finally the electrode material is obtained through high-temperature calcination. The obtained positive electrode material has adjustable spherical particle size distribution, good multi-level distribution effect, high tap density, excellent electrochemical performance, and good slurry processing performance. The method has the advantages of simple operation, easy control of conditions, less dirt, easy handling, wide application range, continuous production and suitability for industrialization.

Description

Technical field [0001] The present invention belongs to the field of secondary battery electrode material, including a lithium ion battery and a sodium ion battery transition metal oxide electrode material, involving the preparation method of the electrode material. Background technique [0002] With the increasing resources of resources and environment, the whole world is working hard to find clean energy solutions that can replace fossil fuels. Including the construction of the energy storage power station to use the power generation of renewable energy such as wind energy, solar energy; simultaneously develop electric vehicles, reduce exhaust emissions and fossil fuel consumption. Secondary batteries (including lithium-ion batteries and sodium ion batteries) are key points to achieve this solution. The lithium-ion battery has advantages over energy, good cycle performance, no memory effect, and has successfully occupied the market of portable electronic products, which is very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525H01M10/054H01M4/04
CPCH01M4/0402H01M4/362H01M4/48H01M10/0525H01M10/054Y02E60/10
Inventor 曹余良杨劲松艾新平杨汉西
Owner SHENZHEN JANAENERGY TECH CO LTD
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