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Coated modified electrode material and preparation method thereof

A technology of electrode materials and coating materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of surface coating layer damage, affecting material performance, etc., to reduce usage, improve uniformity, and balance airflow distribution effect

Active Publication Date: 2019-04-05
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this coating method can reduce the amount of coating liquid used and improve work efficiency to a certain extent, the high-speed impact itself will cause damage to the surface coating layer of the positive electrode material and affect the performance of the material.

Method used

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  • Coated modified electrode material and preparation method thereof
  • Coated modified electrode material and preparation method thereof
  • Coated modified electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] This embodiment provides a fluidized bed and a method of using the fluidized bed to mix the coating material precursor and the positive electrode material first, and then sinter to prepare the coated modified electrode material.

[0087] (1), the structural representation of described fluidized bed is as figure 1 As shown, it includes fluidized bed reactor 1, feed inlet 2, storage tank 3, gas pump 4, gas distribution plate 5, nozzle 6, material outlet 7, air inlet 8, cyclone separator 9 and gas outlet 10 ;

[0088] Wherein, the gas inlet 8 of the fluidized bed reactor 1 is connected to the air pump 4 through a pipeline, the pipeline between the gas inlet 8 and the gas pump 4 is provided with a storage tank 3 and is connected through the outlet of the storage tank 3, The top of the storage tank 3 is provided with a feeding port 2;

[0089] The shape of the gas distribution plate 5 is the same as the cross-sectional shape of the fluidized bed reactor 1 , and is fixed on...

Embodiment 2

[0107] The fluidized bed used is the same as that in Example 1, the difference being that a positive electrode material coated with titanium oxide is prepared, and the preparation process is as follows:

[0108] 1. Preparation of coating solution

[0109] 24g of tetrabutyl titanate, 46g of absolute ethanol, and 100g of simethicone were weighed and mixed to prepare a coating solution.

[0110] 2. Coating process

[0111] (a) Weigh 1000g of nickel-cobalt-manganese ternary 523 cathode material and add it to the storage tank 3 from the feed port 2, and the compressed air with an initial velocity of 1.7m / s sends the cathode material from the air inlet 8 into the fluidized bed reaction through the air pump 4 Device 1, and through the gas distribution plate 5;

[0112] (b) adjust the gas flow rate to be 0.9m / s, so that the positive electrode material forms a stable bed (distributed fluidization) in the fluidized bed reactor 1;

[0113] (c) After the positive electrode material in ...

Embodiment 3

[0121] The fluidized bed, coating method and sintering method adopted are the same as in Example 1, the difference being that in the process of preparing the coated modified cathode material:

[0122] The coating liquid is an aluminum nitrate solution, and the mass fraction of aluminum nitrate is 5wt%;

[0123] Step (a) initial velocity is 2m / s; step (b) gas velocity is 1m / s; step (c) gas velocity is 6m / s.

[0124] The capacity retention rate of the coated material in Example 3 after 100 cycles is 92.59%.

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Abstract

The invention discloses a coated modified electrode material and a preparation method thereof. The method comprises the following steps of spraying a coating liquid into a fluidized bed reactor through a nozzle of a fluidized bed to be mixed with an electrode material which is in a fluidized state, so that coating of the electrode material by a coating material precursor is realized; and then carrying out sintering to obtain the coated modified electrode material which consists of the electrode material and a coating material which coats the surface of the electrode material. By further optimizing the component connection relation of the fluidized bed and the structural design of a gas distribution plate and the nozzles, the coating uniformity can be improved, the coating process can be simplified, the coating process cost is lowered, and the cycling performance of the electrode material is improved, and meanwhile, the problems of influence caused by an abnormal fluidization phenomenonand blocking of the nozzles during working are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a coating modified electrode material and a preparation method thereof, in particular to a coating modified electrode material, and first uses a fluidized bed to mix the coating material precursor and the electrode material , and then sintering to prepare coated modified electrode materials. Background technique [0002] Lithium-ion batteries have high energy density, high output power, are green and environmentally friendly, and do not contain toxic substances such as lead, cadmium, and mercury. They have broad application prospects in new energy vehicles and energy storage. With the rapid development of lithium-ion battery applications, people have higher and higher requirements on the capacity, cycle performance, safety performance and rate performance of lithium batteries. The stability of bulk phase and surface phase structure of cathode materials for lithium ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B01J8/24
CPCB01J8/24H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 黄明龚金保姚淦吕舒宏
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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