High-performance lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems affecting the electrochemical performance of the electrode compaction density battery, the poor contact between the material and the binder conductive agent, and the unsatisfactory positive electrode material. Use requirements and other issues to achieve the effect of improving electrode processing performance, improving energy density and high power output performance, and improving electrode processing performance

Inactive Publication Date: 2010-09-29
QINGDAO LNCM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ternary cathode material has high specific capacity, good structural stability and thermal stability, but also has disadvantages such as low tap density and poor electrode processability.
At present, the nickel-cobalt lithium manganate ternary materials prepared at home and abroad are spherical or spherical secondary particles formed by the aggregation of small primary grains, and the tap density of the material is low, generally lower than 2.4g / cm 3 , The electrode filling performance is not good. When the electrode sheet is rolled, the secondary particles will break, resulting in poor contact between the material, the binder and the conductive agent, which will affect the compaction density of the electrode and the electrochemical performance of the battery.
[0007] Obviously, the existing positive electrode materials cannot meet the requirements of high-performance small lithium-ion batteries for electronic products and power lithium-ion batteries for large-capacity electric vehicles.

Method used

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  • High-performance lithium ion battery cathode material and preparation method thereof
  • High-performance lithium ion battery cathode material and preparation method thereof
  • High-performance lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 50 kg of nickel-cobalt and manganese composite oxide precursor (Ni: Co: Mn = 0.35: 0.3: 0.35) and 26 kg of Li 2 CO 3 Thoroughly grind and mix, then pre-sinter at 450°C for 5 hours, then heat up to 950°C for 24 hours at high temperature, and finally cool to room temperature.

[0029]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 LiNi we prepared 0.35 co 0.3 mn 0.35 o 2 It is a single crystal particle, the average grain size is about 5-10 microns, the particle size is uniform, and the surface is smooth.

[0030] 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 synthesized material has a standard layered structure and no impurity phase exists.

[0031] Using the BET method ...

Embodiment 2～10

[0036] Synthesize a series of layered structure LiNi under different conditions by the preparation method of the present invention x co y m 1-x-y o 2 positive active material

[0037] According to the preparation method provided by the invention, under the different conditions listed in table 1, a series of layered structure LiNi x co y m 1-x-y o 2 Positive active material.

[0038] Table 1

[0039] Example

Embodiment 11

[0041] Mix 50 kg of nickel-cobalt-manganese-aluminum composite hydroxide precursors with 27.4 kg of lithium hydroxide, then fully ball mill, then pre-sinter at 400 degrees for 8 hours, then heat up to 850 degrees for high-temperature sintering for 24 hours, and finally cool At room temperature, the required lithium-ion battery-containing nickel-cobalt layered structure positive electrode active material is synthesized.

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Abstract

The invention relates to a lithium ion battery cathode material LiNixCoyM1-x-yO2 prepared from micron-sized single crystal particles and a preparation method thereof, wherein x is greater than 0 and is not more than 0.8, y is greater than 0 and is not more than 0.5, and M is one or two of Li, Mn, Al and Mg. The invention is characterized in that (1) composite oxide or hydroxide of transition metal nickel, transition metal cobalt and modified metal M is used as a raw material, the composite oxide or hydroxide is porous aggregate comprising nanocrystals, the average size of the aggregate is 2-50 micrometers, and the specific surface area of the aggregate is greater than 15m<2>/g (measured by BET method); (2) the composite metal oxide or hydroxide and lithium salts are milled in a ball mill, the micron-sized composite metal oxide or hydroxide is converted into nanocrystal particles to obtain a nano-sized mixed precursor of the composite metal oxide or hydroxide and the lithium salts, and the mixed precursor is sintered at uniform temperature to obtain the required lithium ion battery cathode material; and (3) the prepared lithium ion battery cathode material LiNixCoyM1-x-yO2 is basically prepared from micron-sized single crystal particles, and the average size of the single crystal particles is 2-20 micrometers. In addition, the product has excellent physical and electrochemical properties, such as ultra-low specific surface area, reasonable particle size distribution, good electrode processing properties, ultra-long cycle life, excellent rate capability, obvious high and low temperature cycling and storing properties and excellent safety; and the product can be widely used as a high-performance lithium ion battery cathode material. The invention provides the high-performance lithium ion battery cathode material and the preparation method thereof.

Description

technical field [0001] The invention relates to a secondary battery cathode material, in particular to a nickel-cobalt system layered 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 diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/50H01M4/52H01M4/04C01G53/04
CPCY02E60/10
Inventor 孙玉城
Owner QINGDAO LNCM
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