Micron single crystal granular anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, alkaline storage batteries, circuits, etc., can solve the problem that cathode active materials cannot meet the requirements of producing large-capacity or high-power lithium-ion batteries, self-discharge reversible capacity decay, reduce Cathode material specific capacity and other issues, to achieve the effect of improving cycle life and high power output performance, reducing obstacles, and improving high-rate charge-discharge performance

Inactive Publication Date: 2009-11-25
QINGDAO LNCM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle and storage performance of this material at high temperature (above 55°C) is poor, so LiMn 2 o 4 Lithium-ion batteries, which are positive active materials, have serious self-discharge phenomena and rapid reversible capacity decay.
[0005] LiMn can be improved by replacing part of Mn with elements Li, Mg, Al, Cr, Ni, Co, etc. 2 o 4 The structural stability of the material improves the cycle performance of the material, but a disadvantage of doping is that the specific capacity of the positive electrode material is reduced
[0006] Obviously, the existing positive electrode active materials cannot meet the requirements of producing large-capacity or high-power lithium-ion batteries

Method used

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  • Micron single crystal granular anode material of lithium ion battery
  • Micron single crystal granular anode material of lithium ion battery
  • Micron single crystal granular anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 50 kg of manganese and aluminum composite oxide precursor MnO 2 -Al 2 o 3 (Mn:Al=1.85:0.15) and 11 kg Li 2 CO 3 Thoroughly grind and mix, then pre-sinter at 450°C for 5 hours, then heat up to 950°C and sinter at high temperature for 24 hours, and finally cool down to room temperature slowly.

[0027] The particle size and morphology of the materials were observed on a Hitachi S-4000 scanning electron microscope. From figure 1 We can find that the new modified lithium manganese oxide we prepared is a single crystal particle, presenting a perfect regular octahedron, the grain size is about 5-10 microns, the particle size is uniform, and the surface is smooth.

[0028] The crystal structure of the material was analyzed using a Rigaku B / Max-2400 X-ray diffractometer (Rigaku Ltd.), with Cu Kα line as the light source, and the diffraction angle 2θ ranged from 10° to 90°. From figure 2 We can find that the synthetic material has a standard cubic structure of normal spi...

Embodiment 2～10

[0034] Synthesize a series of positive spinel structure lithium manganese oxide LiMn under different conditions according to the preparation method of the present invention 2-z m z o 4 positive active material

[0035] According to the preparation method provided by the invention, under the different conditions listed in table 1, a series of positive spinel structure lithium manganese oxide LiMn were synthesized 2-z m z o 4 positive active material.

[0036] Table 1

[0037] Example

Embodiment 11

[0039] 50 kg of manganese and aluminum composite oxide precursor Mn 3 o 4 -Al 2 o 3 (Mn:Al=1.8:0.2) and 12 kg Li 2 CO 3 Fully grind and mix, then pre-sinter at 400°C for 8 hours, then heat up to 850°C and sinter at a high temperature for 24 hours, and finally cool slowly to room temperature to synthesize the required positive spinel manganese-containing cathode active material for lithium-ion batteries.

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Abstract

The invention relates to a micron single crystal modified normal spinel lithium manganate LiMn(2-z)MzO4 and a preparation method thereof, wherein z is more than or equal to 0 and is less than or equal to 0.5. The preparation method is characterized in that firstly, composite oxides of manganese and modified metal M are used as raw materials of preparation, the composite oxides are porous aggregates consisting of nanometer microcrystal, the average size of the aggregates is between 5 micrometers and 20 micrometers, and the specific surface of the composite oxides powder is more than 20m / g (measured by a BET method); secondly, the prepared modified lithium manganate material basically consists of micro regular octahedron single crystal, the average size of the single crystal granular is between 5 micrometers and 20 micrometers, the specific surface is lower and is less than 0.5m / g. In addition, the product has excellent physical and electrochemical properties, such as ultralow specific surface, reasonable granular size distribution, better electrode processing property and ultralong circulation service life, excellent multiplying power property, remarkable high-low temperature cycling and storage properties, and best safety, and can be widely used as the materials of an anode of the lithium ion battery, especially a power lithium ion battery.

Description

technical field [0001] The invention relates to a secondary battery cathode material, in particular to a manganese-containing cathode material for a lithium ion battery. technical background [0002] In the early 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions, and related patents have been applied for. Among them, lithium cobaltate was successfully used in the first commercialized lithium-ion battery for small electronic products as a positive electrode material by Sony Corporation of Japan in the early 1990s due to its excellent electrochemical performance and good electrode processing performance. Although lithium nickelate has a high reversible specific capacity (210mAh / g), it cannot be applied in practical lithium-ion batteries due to its poor structural and thermal stability and difficult syn...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M10/24
CPCY02E60/124Y02E60/10
Inventor 孙玉城郭宝孙立水焦磊
Owner QINGDAO LNCM
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