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Single-crystal ternary positive electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low cobalt content, increased lattice oxygen defects, and increased lithium-nickel mixed discharge.

Pending Publication Date: 2020-12-01
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In terms of the preparation of single crystal ternary materials with low cobalt and high manganese content, there are few relevant documents that can be retrieved at present. For the most important problem in the preparation process, that is, single crystal particles caused by high manganese content and low cobalt content There is no effective way to solve the problem that it is difficult to grow up. The method of continuously increasing the sintering temperature, the sintering temperature is increased to about 1050°C, can obtain a good single crystal morphology, but because the sintering temperature is too high, it will It brings problems such as increased lithium-nickel mixing, increased lattice oxygen defects, and lattice lithium volatilization

Method used

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  • Single-crystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Single-crystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Single-crystal ternary positive electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Select the precursor Ni with a nickel-cobalt-manganese molar ratio of 55:05:40 and a D50 of 4 microns 0.55 co 0.05 mn 0.40 (OH) 2 , after mechanical activation, its D50 is controlled at 2.9 microns, and then it is uniformly mixed with lithium hydroxide and strontium carbonate. The ratio of the total molar number of transition metals used is a molar ratio of 3:1000;

[0041] (2) The mixed powder is sintered in an air atmosphere at a sintering temperature of 980 ° C, and the sintering is completed for 10 hours, and finally the ternary cathode material Li 1.06 Ni 0.55 co 0.05 mn 0.40 Sr 0.003 o 2 .

[0042] Utilize the scanning electron microscope to detect and obtain the scanning electron micrograph (as shown in Fig. figure 1 ), the prepared ternary material was detected by X-ray diffraction, and the XRD diffraction pattern of the material was obtained (such as figure 2 ), at the same time, the specific unit cell parameters of the material were obtained (s...

Embodiment 2

[0047] (1) Select the precursor Ni with a nickel-cobalt-manganese molar ratio of 55:05:40 and a D50 of 3 microns 0.55 co 0.05 mn 0.40 (OH) 2 , after mechanical activation, its D50 is controlled at 2.5 microns, and then it is uniformly mixed with lithium hydroxide and strontium carbonate. The ratio of the total moles of transition metals used is a molar ratio of 2:1000;

[0048] (2) The mixed powder is sintered in an oxygen-enriched atmosphere at a temperature of 980°C, and the sintering is completed for 10 hours, and finally the ternary cathode material Li 1.06 Ni 0.55 co 0.05 mn 0.40 Sr 0.002 o 2 .

[0049] Using X-ray diffraction, the specific unit cell parameters of the material were detected (see Table 1).

[0050] Using the same button battery manufacturing method and test system as in Example 1, the first discharge specific capacity of the material at a current density of 0.1C is 177.2mAh / g, and the 50-cycle cycle retention rate of the material at a current den...

Embodiment 3

[0052] (1) Select the precursor Ni with a nickel-cobalt-manganese molar ratio of 55:05:40 and a D50 of 5 microns 0.55 co 0.05 mn 0.40 (OH) 2 , after mechanical activation, its D50 is controlled at 2 microns, and then it is uniformly mixed with lithium hydroxide and strontium carbonate. The ratio of the total molar number of transition metals used is a molar ratio of 1:1000;

[0053] (2) The mixed powder is sintered in an air atmosphere at a sintering temperature of 900 °C, and the 30h heat preservation sintering is completed to finally prepare the ternary cathode material Li 1.06 Ni 0.55 co 0.05 mn 0.40 Sr 0.001 o 2 .

[0054] Using X-ray diffraction, the specific unit cell parameters of the material were detected (see Table 1).

[0055] Using the same button battery manufacturing method and test system as in Example 1, the first discharge specific capacity of the material at 0.1C current density is 176.5mAh / g, and the 50-cycle cycle retention rate of the material at...

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Abstract

The invention provides a single-crystal ternary positive electrode material, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium-ion batteries. Aimedat the problem that low-cobalt high-manganese ternary material single crystal particles are difficult to grow up, the preparation method of the single-crystal ternary positive electrode material provided by the invention can promote crystal growth and preferred directional growth of the low-cobalt / cobalt-free high-manganese material. The single-crystal ternary positive electrode material providedby the invention has relatively good single-crystal morphology, the [003] crystal face in single-crystal particles grows directionally, more layered structures can be exposed, a lithium ion diffusionpath can be effectively shortened, the electrochemical performance of the material is improved, and meanwhile, the preparation method is simple and easy for large-scale production.

Description

technical field [0001] The invention relates to a single-crystal nickel-cobalt-manganese ternary positive electrode material with preferential growth in crystal form, low cobalt and high manganese content, a preparation method thereof and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries are widely used in electric vehicles, portable electronic devices and other fields due to their high energy density and long cycle life. Due to the continuous improvement of the demand for energy density, the ternary cathode material (LiNi x co y mn z o 2 , x+y+z=1), has gradually become a research hotspot in the field of cathode materials. At present, ternary cathode materials with nickel, cobalt and manganese contents of 523, 622 and 811 systems have been gradually applied to the manufacture of power batteries. [0003] With the continuous development of the ternary system, while pursuing h...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/485H01M10/0525C01G53/006C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 孙洪旭申兰耀黄震雷韩坤明于永利杨新河周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD
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