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Nanoscale positive electrode material, preparation method and preparation device thereof and lithium ion battery

A technology for positive electrode materials and preparation devices, applied in nanotechnology, battery electrodes, nanotechnology, etc., can solve problems such as battery rate performance degradation, and achieve the effects of improving electrical performance, small particle size, and improving uniformity

Active Publication Date: 2022-05-13
FOSHAN DYNANONIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems existing in the prior art, the present invention provides a nano-scale positive electrode material and its preparation method, preparation device and lithium ion battery, which can depolymerize the phosphate-based positive electrode material, and solve the problems in the preparation process of the solid-phase synthesis method. Due to the agglomeration of active components, the rate performance of the battery decreases, which has industrial application value

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  • Nanoscale positive electrode material, preparation method and preparation device thereof and lithium ion battery
  • Nanoscale positive electrode material, preparation method and preparation device thereof and lithium ion battery
  • Nanoscale positive electrode material, preparation method and preparation device thereof and lithium ion battery

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Embodiment 1

[0109] This embodiment provides a preparation device for depolymerization and coating integrated nanoscale positive electrode material, such as figure 1 As shown, the preparation device includes a communicating coating chamber 1 and a collision depolymerization chamber 2 from top to bottom; the collision depolymerization chamber 2 is arranged at the lower left side of the coating chamber 1;

[0110] The bottom of the collision depolymerization chamber 2 is provided with a first gas inlet 5; the side wall of the collision depolymerization chamber 2 is provided with a group of opposite material inlets 8 (ie, two material inlets). The material inlet 8 is connected with a material conveying device, the material conveying device is a high-pressure pneumatic conveying device, and the high-pressure pneumatic conveying device is used to provide and control the conveying pressure. Preferably, the high-pressure conveying device includes a material transfer box and an air compressor, the...

Embodiment 2

[0116] This embodiment provides a preparation device for depolymerization and coating integrated nanoscale positive electrode material, such as figure 2 As shown, the preparation device includes a communicating coating chamber 1 and a collision depolymerization chamber 2 from top to bottom; the collision depolymerization chamber 2 is arranged at the lower right side of the coating chamber 1;

[0117] The bottom of the collision depolymerization chamber 2 is provided with a first air inlet 5; the relative position of the side wall of the collision depolymerization chamber 2 is provided with two groups of relative material inlets 8 (i.e. 4 material inlets); The material inlet 8 is connected with a material conveying device, the material conveying device is a high-pressure pneumatic conveying device, and the high-pressure pneumatic conveying device can be used to control the conveying pressure. The high-pressure pneumatic conveying device is used to provide and control the conve...

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Abstract

The invention provides a nanoscale positive electrode material, a preparation method and a preparation device thereof and a lithium ion battery, and the preparation method comprises the following steps: performing high-pressure injection on aggregates of the positive electrode material from opposite directions to perform collision depolymerization, and performing particle size screening to obtain a depolymerized sample; and coating the depolymerized sample with an organic film to obtain the coated nano-scale positive electrode material. According to the invention, agglomerated large particles can be depolymerized into single small crystal grains, meanwhile, the outer surfaces of the small crystal grains are coated with organic films, so that the crystal grains are dispersed, and continuous screening and coating in a suspension state after depolymerization can be realized under the action of airflow, so that the coating uniformity is improved; and the method has great significance in improving the rate capability, the low-temperature performance and the high-energy density brought by grading of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a nanoscale positive electrode material, a preparation method, a preparation device and a lithium ion battery. Background technique [0002] Nano-scale lithium iron phosphate crystals are usually synthesized by hydrothermal and solvothermal methods, which can better control the size and shape of crystal particles, but the above methods have low yield, troublesome waste liquid treatment, and high-pressure environment bring safety hazards, which limit its industrial application. [0003] The solid-phase synthesis method is currently widely used in the industrial production of lithium battery cathode materials. It is simple to operate and easy to produce on a large scale. However, during the sintering process, the grains tend to agglomerate into large particles, and it is difficult to obtain nano-sized particles, which af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/525H01M4/505H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/602H01M4/525H01M4/505H01M10/0525B82Y30/00B82Y40/00
Inventor 徐荣益李亨利孔令涌李意能刘其峰
Owner FOSHAN DYNANONIC
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