High-nickel ternary material with cobalt-rich surface layer and preparation method and application thereof

A high-nickel ternary material and surface layer technology, applied to electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as poor cycle performance, unstable structure, short process, etc., to improve cycle performance and reduce grain size. The effect of cell volume change and short process

Active Publication Date: 2017-06-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a nickel-based ternary positive electrode material with a cobalt-rich surface layer, aiming at problems such as unstable structure and poor cycle performance during charging and discharging of high-nickel ternary positive electrode materials. It has the advantages of short process, simple operation, suitable for industrialization, etc.

Method used

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  • High-nickel ternary material with cobalt-rich surface layer and preparation method and application thereof
  • High-nickel ternary material with cobalt-rich surface layer and preparation method and application thereof
  • High-nickel ternary material with cobalt-rich surface layer and preparation method and application thereof

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Embodiment 1

[0033] The high-nickel ternary material with cobalt-rich surface layer described in this embodiment is prepared by the following method:

[0034] (1) Prepare a cobalt chloride solution with a concentration of 0.5mol / L, add it to the sprayer equipment, and perform spray pyrolysis at 750°C to obtain spherical Co 3 o 4 , wherein the carrier gas in the spray pyrolysis process is oxygen, the oxygen flow rate is 1L / min, and the sprayed solution flow rate is 1.5mL min;

[0035] (2) the porous spherical Co obtained in step (1) 3 o 4 With LiOH and high nickel ternary hydroxide precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix well in the mortar, Ni 0.8 co 0.1 mn 0.1 (OH) 2 , porous spherical Co 3 o 4 The molar ratio of LiOH and LiOH is 100:5:110;

[0036] (3) Raise the temperature of the mixed material obtained in step (2) at a rate of 5°C / min, pre-sinter at 500°C for 6 hours, and then sinter at a high temperature of 780°C for 15 hours to obtain the cobalt-rich surface layer and h...

Embodiment 2

[0041] The cobalt-rich surface layer and high-nickel ternary material described in this example is prepared by the following method:

[0042] (1) Prepare a cobalt chloride solution with a concentration of 0.5mol / L, add it to the sprayer equipment, and spray and pyrolyze it at 750°C to obtain Co 3 o 4 , wherein the carrier gas in the spray pyrolysis process is oxygen, the oxygen flow rate is 2L / min, and the sprayed solution flow rate is 1.2mL / min;

[0043] (2) Co obtained in step (1) 3 o 4 With LiOH and high nickel ternary hydroxide precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix well in the mortar, Ni 0.8 co 0.1 mn 0.1 o x , spherical Co 3 o 4 The molar ratio of LiOH and LiOH is 100:10:115;

[0044] (3) Raise the temperature of the mixed material obtained in step (2) at a rate of 8°C / min, pre-sinter at 450°C for 6 hours, and sinter at 800°C for 12 hours to obtain the cobalt-rich surface layer and high-nickel ternary material described in this example . According to IC...

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Abstract

The invention discloses a high-nickel ternary material with a cobalt-rich surface layer and a preparation method thereof. The method comprises the following steps: (1) preparing a cobalt chloride solution by spray pyrolysis to obtain porous spherical Co3O4; (2) uniformly mixing the porous spherical Co3O4 with a high-nickel ternary hydroxide precursor and lithium salt, and then sintering the mixture to obtain a nickel-based ternary anode material with the cobalt-rich surface layer. The surface of the anode material has a uniform cobalt-rich coating layer, and reaction of Ni4+ and electrolyte at the position of an interface is reduced. Meanwhile, phase change of H2-H3 is inhibited in charging and discharging processes of the material, volume change of unit cells due to phase change is reduced, therefore, a layer structure of the material is stable, and the cycle performance is improved. The raw materials used in the preparation method are simple and easy to obtain, the process is simple, and the technological process is short.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a high-nickel ternary material with a cobalt-rich surface layer and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in 3C electronics, chemical energy storage equipment and new energy vehicles due to their high operating voltage, small size, light weight, no memory effect, small self-discharge, and long cycle life. Compared with traditional cathode materials such as lithium iron phosphate and lithium cobalt oxide, nickel-cobalt-manganese ternary cathode materials have the characteristics of nickel, cobalt, and manganese, and have high specific capacity, good cycle performance, and low cost. advantage. With the rapid development of new energy vehicles, the demand for mileage in the consumer market continues to increase. High-nickel ternary material batteries with significant advantages in energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王志兴李艳李新海郭华军王接喜李滔胡启阳彭文杰
Owner CENT SOUTH UNIV
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