Lithium manganate material and preparation method thereof and lithium ion battery cathode material

A technology of lithium manganese oxide and slurry, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of irregular shape, impure crystal, uneven mixing, etc., achieve good conductivity, excellent cycle, strengthen Effect of Mix Uniformity

Active Publication Date: 2015-03-18
BEIJING NAT BATTERY TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to propose a preparation method of lithium manganate material, the prepared lithium manganate material and the positive electrode material of lithium ion battery, so as to overcome the inhomogeneous mixing and uneven morphology brought about by the traditional synthesis method of lithium manganate. Defects such as regularity and crystal impurity

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  • Lithium manganate material and preparation method thereof and lithium ion battery cathode material
  • Lithium manganate material and preparation method thereof and lithium ion battery cathode material
  • Lithium manganate material and preparation method thereof and lithium ion battery cathode material

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preparation example Construction

[0031] The present invention proposes a preparation method of lithium manganate material, comprising the following steps (such as Figure 5 ):

[0032] Step 1: Add the lithium source, manganese source, doped metal oxygen compound, and flux to the ball mill (this application ball mill uses the QHJM-100 model produced by Changsha Qinghe General Machinery Equipment Co., Ltd.), and add The solvent is ball milled in a ball mill to make the slurry particle size below 1 μm;

[0033] Step 2: Transfer the slurry obtained in step 1 to a sand mill (the sand mill used in this application uses the KLZr-3B model produced by Shenzhen Keli Nano Engineering Equipment Co., Ltd.) for crushing, and add Dispersant, which stabilizes the components of the suspension and makes the particle size of the slurry reach 200nm to 300nm;

[0034] Step 3: transfer the slurry obtained in step 2 into a centrifugal spray drying tower (the spray drying tower of this application adopts the BG-10 model produced b...

Embodiment 1

[0055] Lithium carbonate, manganese dioxide, magnesium oxide, and aluminum oxide totaled 10kg according to the molar ratio Li:Mn:Mg:Al=1.04:1:0.01:0.02, and weighed 50g of boron trioxide and 500g of polyethylene glycol Add 20000 to the 100L circulating stirring ball mill tank machine at the same time, and add 30Kg deionized water to the ball mill tank for stirring ball milling. The stirring frequency is 30Hz, and the circulating pneumatic diaphragm pump is turned on to increase the uniformity of the mixture. After about 3 hours of ball milling, the slurry is taken Conduct particle size test D 50 When the thickness is less than 1 μm, stop the ball mill and put the slurry into a sand mill.

[0056] Start the horizontal sand mill for further particle refinement and mixing. The speed frequency of the sand mill is controlled at 1300Hz, and the particle size D after sanding for about 5 hours 50 When it is reduced to between 200nm and 300nm, the fine crushing is completed. Pour th...

Embodiment 2

[0060] Lithium carbonate, manganese dioxide, magnesium oxide, and aluminum oxide totaled 10kg according to the molar ratio Li:Mn:Mg:Al=1.01:1:0.05:0.01, and weighed 10g of boron trioxide and 500g of polyethylene glycol Add 20000 to the 100L circulating stirring ball mill at the same time, add 30Kg deionized water to the ball milling tank for stirring ball milling, the stirring frequency is 30Hz, and turn on the circulating pneumatic diaphragm pump to increase the uniformity of the mixture. After about 3h ball milling, take the slurry for Particle size test D 50 When the thickness is less than 1 μm, stop the ball mill and put the slurry into a sand mill.

[0061] Start the horizontal sand mill for further particle refinement and mixing. The speed frequency of the sand mill is controlled at 1200Hz, and the particle size is D 50 Fine crushing is completed when reduced to 300nm. Pour the slurry into a spray drying container jar ready for spraying.

[0062] Spray drying adjusts...

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Abstract

The invention provides a lithium manganate material and a preparation method thereof and a lithium ion battery cathode material. The preparation method comprises the following steps: mixing a manganese source, a lithium source and a compound of one or more doped metals and adding a fluxing agent and ball-milling in a solvent, when the particle size reaches below 1 micrometers, further crushing by using a superfine mill and uniformly mixing so that the particle size of first-time particles reaches 200-300nm and slurry is uniformly mixed; and driving the slurry in a centrifugal spray dryer after iron is removed for sphere granulating, and finally performing step-wise sintering to prepare the lithium manganate material. Because doping of multiple metals, modifying of the surface of the fluxing agent, fine crushing of a sand mill and spray-granulating, the lithium manganate material has high conductivity, smooth surface and low specific surface area, good mixing uniformity and uniform spherical particles.

Description

technical field [0001] The invention relates to a preparation method of a high-magnification, long-life anode material. Background technique [0002] With the shortage of global oil resources and the increasing air pollution, the development of clean energy has become an important task for all countries. Environmentally friendly, fuel-efficient hybrid vehicles and pure electric vehicles are currently the most important development direction. As the most important lithium-ion cathode material in the battery of electric vehicles, it has become the hottest research direction at present. [0003] Among several important positive electrode materials for power batteries, spinel lithium manganese oxide still occupies an important position in power batteries due to its rich resources, low price, and good consistency. Lithium manganese oxide is already used in a considerable part of batteries on electric bicycles and electric buses. And in the near future, companies such as Japan ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/505H01M4/62Y02E60/10
Inventor 戴思琦郭伟慈云祥
Owner BEIJING NAT BATTERY TECH
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