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Method for preparing positive electrode material of lithium ion accumulator

A technology for positive electrode materials and storage batteries, which is applied in the field of preparation of positive electrode materials for lithium-ion batteries. It can solve problems such as low tap density, low material filling, and battery capacity limitations, and achieve improved structural stability, enhanced safety, and price advantages. obvious effect

Inactive Publication Date: 2005-03-16
吴孟涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium-ion battery cathode material LiNi 0.5-x mn 0.5-x m 2x o 2 (at least one element in M=Co, Ti, Al, 0≤x<0.5) involves sol-gel method, ion exchange method and high-temperature solid-phase method, but adopts existing high-temperature solid-phase synthesis method and co- The positive electrode materials of lithium-ion batteries manufactured by precipitation method all have the defect of low tap density and low filling amount of materials, which greatly restricts the increase of battery capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Lithium carbonate 377.5 grams and Mn 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 924.3 grams are mixed by mechanical stirring, and the main content of lithium carbonate is 99.6%, and the average particle size is 2.2 μm; the Mn 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 X-ray diffraction analysis has no impurity peaks in the phase, and the average particle size is 2.5 μm; its particle size distribution is D 50 = 6.2 μm. The above-mentioned mixed raw materials are loosely packed and piled up with a thickness of 6mm. They are pressed and granulated on a press, and the pressure of the press is 10MPa; type furnace, muffle furnace, roller kiln, etc.), the temperature is 920°C, the time is 6 hours, the heating rate is 12°C / min, and the amount of oxygen is 2 cubic meters / hour kg; the speed is 5°C / min. to room temperature, pulverize the product, powder particle size D 50 =8 μm-10 μm. At this time, the powder tap density is 2.35g / cm 3 , specific surface area 1.5m 2 / g.

Embodiment 2

[0021] Lithium carbonate 383.2 grams and Mn 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 924.3 grams are mixed, the main content of lithium carbonate is 99.5%, and the average particle size is 1.5 μm; the Mn 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 Precursor X-ray diffraction analysis has no peaks in the phase, and the average particle size is 1.2 μm; its particle size distribution is D 50 = 3.2 μm. The above-mentioned mixed raw materials are loosely packed, and the thickness is 12mm. They are pressed and granulated on a press, and the pressure of the press is 16MPa; the raw materials after pressing are roasted at 950°C for 8 hours, and the heating rate is 8°C / min. The amount of air introduced is 3 cubic meters / hour kg; the room temperature is lowered at a rate of 5°C / min, and the product is pulverized, and the powder particle size is D 50 =10 μm-15 μm. At this time, the powder tap density is 2.56g / cm 3 , specific surface area 1.1m 2 / g.

Embodiment 3

[0023] Lithium hydroxide (LiOH·H 2 O content 90%) 480.9 g and Mn 0.4 Ni 0.4 co 0.2 (OH) 2 927.95 g ball milled, the Mn 0.4 Ni 0.4 co 0.2 (OH) 2 Precursor X-ray diffraction analysis of the phase has no miscellaneous peaks, with an average particle size of 2.6 μm; its particle size distribution is D 50 = 6.3 μm. The above-mentioned mixed raw materials are loosely packed, and the thickness is 34mm. They are pressed and granulated on a press, and the pressure of the press is 32MPa; the pressed raw materials are roasted at 925°C for 8 hours, and the heating rate is 5°C / min. The amount of oxygen introduced is 0.1 cubic meters per hour per kilogram; the rate of cooling to room temperature is 7°C per minute, and the product is pulverized, and the powder particle size is D 50 =7 μm-15 μm. At this time, the powder tap density is 2.52g / cm 3 , specific surface area 1.23m 2 / g.

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Abstract

The invention relates to a manufacture method for positive material of lithium ion accumulator , whose component concentration is: at least one element between LiNi0.5-xM0.5-XM2xO2 (M=Co,Ti,Al) (0<=X<0.5). The manufacture method includes the following steps: dry or wet mix of sentiment hydroxide or carbonate compounds of at least one element between Ni,Mn,Co,Ti and Al or its oxide and lithium hydroxide or carbonate lithium (dry for the material of wet mixture); accumulate the mixture whose width is 2mm~60mm; make particle under the pressure of 4MPa~40MPa; high temperature solid state reaction happens under the temperature of 700~1050deg.C; shatter it after cooling, the diameter of particle is 0.5~25mu m. The manufacture method can make the density of products reach 2.0g / cm3~2.8g / cm3, increase positive filler level of lithium ion and lithium polymer accumulator and its capacity.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion accumulator. Background technique [0002] Due to the advantages of high specific capacity, good cycle performance, high safety performance, and low cost, the cathode material of lithium-ion battery is being widely valued. [0003] At present, some domestic and foreign scientific research institutes and their manufacturers engaged in the research of battery materials have been making unremitting efforts to optimize the production process of lithium-ion battery cathode materials. The invention patent (JP2001266876-A) applied by Japan's SONY company discloses a non-liquid electrolyte battery anode active material Li x Ni Y co Z al (1-Y-Z) o 2 The preparation method of the method is to obtain a precursor by blending nickel-cobalt hydroxide obtained by a co-precipitation method with an aluminum compound and lithium hydroxide, and then burning it to obtain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01G1/02H01M4/04H01M4/48H01M4/50H01M4/52H01M4/58H01M10/36H01M10/40
CPCH01M4/505Y02E60/122H01M4/525H01M4/485H01M10/0565H01M10/0525Y02E60/10
Inventor 吴孟涛陈勃涛黄来和徐宁张宁
Owner 吴孟涛
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