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Multimodal powders based on lithium transition metal oxides and their application in rechargeable batteries

A lithium transition metal and transition metal technology, applied in multimodal powder and in the application field of rechargeable batteries, can solve the problems of increased BET of materials, slowed diffusion rate, decreased porosity, etc., and can reduce porosity with a simple method. , Improve the effect of filling effect

Active Publication Date: 2021-08-03
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In lithium cobalt oxide, the compaction density of the material is increased, the porosity is reduced, and the Li diffusion rate is slowed down. Then the internal diffusion path of these particles needs to be shortened. This can be achieved by reducing the particle size or increasing the porosity of the material. Increasing the porosity will make the material BET increases, it is very difficult to achieve high density with nanoscale cathode materials

Method used

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  • Multimodal powders based on lithium transition metal oxides and their application in rechargeable batteries
  • Multimodal powders based on lithium transition metal oxides and their application in rechargeable batteries
  • Multimodal powders based on lithium transition metal oxides and their application in rechargeable batteries

Examples

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Effect test

Embodiment 1

[0060] A method for preparing a multimodal powder based on lithium transition metal oxides, comprising the following steps:

[0061] (1) According to Li / Co=1.06 (molar ratio), mix magnesium oxide (containing Mg 2000ppm), aluminum oxide (containing Al2000ppm), lithium carbonate and cobalt tetraoxide in a ball mill for 6 hours, and put the mixture into a sagger , placed in a furnace for sintering, the heating rate was 5°C / min, and the temperature was kept at 1020°C for 10h to obtain lithium cobaltate. Lithium cobaltate is crushed to obtain large particles of lithium cobaltate D50=22 microns, which is the primary product of powder A. The particle size test has only one peak at 22 microns, and the BET is 0.13㎡ / g;

[0062] (2) In continuous Co 3 o 4 (D50=5μm), when the mixed material Li / Co=1.015, the four materials of magnesium oxide (containing Mg2000ppm), aluminum oxide (containing Al1000ppm), lithium carbonate and tricobalt tetroxide are mixed in the ball mill for 6h, and the ...

Embodiment 2

[0069] A method for preparing a multimodal powder based on lithium transition metal oxides, comprising the following steps:

[0070] (1) According to Li / Co=1.04 (molar ratio), mix magnesium oxide (containing Mg 2000ppm), aluminum oxide (containing Al3000ppm), lithium carbonate and cobalt tetraoxide in a ball mill for 6 hours, and put the mixture into a sagger , put it into the furnace for sintering, the heating rate is 5°C / min, keep at 750°C for 1h, continue to raise the temperature to 1010°C, and hold for 10h to obtain lithium cobaltate. Lithium cobaltate is crushed to obtain large particles of lithium cobaltate D50 = 18 microns, which is the primary product of powder A. There are two quantitative peaks in the particle size test, one peak is at 7 microns, the other is at 20 microns, and the BET is 0.144 ㎡ / g;

[0071] (2) In continuous Co 3 o 4 (D50=3μm), when the mixture L / C=1.015, mix the four materials of magnesium oxide (containing Mg2500ppm), aluminum oxide (containing...

Embodiment 3

[0077] A method for preparing a multimodal powder based on lithium transition metal oxides, comprising the following steps:

[0078] (1) According to Li / Co=1.05 (molar ratio), mix magnesium oxide (containing Mg 2000ppm), aluminum oxide (containing Al2000ppm), lithium carbonate and cobalt tetraoxide in a ball mill for 6 hours, and put the mixture into a sagger , put it into a furnace for sintering, the heating rate is 3°C / min, and keep at 1040°C for 12h to obtain lithium cobaltate. Lithium cobaltate is crushed to obtain the primary product D50=17 microns of large particle lithium cobaltate, and the particle size test has only one peak at 18 microns; take a burnt lithium cobaltate and add alumina (containing Al 1000ppm), titanium dioxide (containing Ti 500ppm) Mixed by ball milling, fired at 800°C for 6 hours and finally synthesized Lithium cobaltate, which is the secondary product of powder A, with only one particle size peak at 21 microns, and BET of 0.14㎡ / g

[0079] (2) In c...

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Abstract

The invention discloses a multi-peak powder based on lithium transition metal oxides and its application in rechargeable batteries. The preparation method is to combine powder A primary or secondary product with powder B primary product and / or powder C primary Products are mixed, mixed with transition metal oxides or hydroxides, and sintered at a temperature of at least 500° C. in an oxygen-containing atmosphere to obtain a multimodal powder based on lithium transition metal oxides. In the invention, a multi-peak structure powder is formed by various particles to form a positive electrode material with high filling rate and stable structure applied under high voltage. The method of the invention is simple, and the prepared multi-peak material is composed of various particles, better meets the filling requirements, improves the filling effect, reduces the porosity, enables the material to obtain higher volumetric energy density, and has better cycle performance at the same time.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a multimodal powder based on lithium transition metal oxides and its application in rechargeable batteries. The powder can be used as a positive electrode material for lithium ion batteries. Background technique [0002] Rechargeable lithium-ion batteries have the characteristics of high power density, high energy and long life, and are widely used in the 3C field. With the surge in the use of lithium cobalt oxide materials, the safety and energy density of its rechargeable batteries are two related issues. [0003] For lithium cobalt oxide powder, factors affecting density include particle shape, primary particle size, and particle size distribution. Increasing compaction density and reducing porosity can increase electrode density. The positive electrode of lithium cobalt oxide full battery is generally compacted at 3.9-4.2g / cm 3 , the compaction density incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/48H01M10/0525H01M4/36
CPCY02E60/10
Inventor 李斌阮丁山毛林林李玲林弘毅李长东
Owner GUANGDONG BRUNP RECYCLING TECH