A kind of preparation method of single crystal type high-nickel ternary positive electrode material

A cathode material, high nickel technology, applied in chemical instruments and methods, nickel compounds, electrical components, etc., can solve the problems of easy formation of impurity phase, unstable electrochemical performance, long reaction time, high price, etc. The effect of nickel mixing phenomenon, good electrochemical performance, good liquid phase environment

Active Publication Date: 2021-03-02
苏州拉瓦锂能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional ion doping is often achieved by sol-gel or co-precipitation methods, which are cumbersome and expensive
Surface coating is realized by solid phase method, which needs to be carried out at high temperature, has the characteristics of long reaction time, high energy consumption, easy formation of impurity phase and unstable electrochemical performance.

Method used

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  • A kind of preparation method of single crystal type high-nickel ternary positive electrode material
  • A kind of preparation method of single crystal type high-nickel ternary positive electrode material
  • A kind of preparation method of single crystal type high-nickel ternary positive electrode material

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preparation example Construction

[0028] A method for preparing a single-crystal high-nickel ternary positive electrode material, comprising the following steps:

[0029] Select nickel-cobalt-manganese hydroxide precursor or nickel-cobalt-aluminum hydroxide precursor as the reaction precursor;

[0030] The reaction precursors are purchased from the market or prepared in the laboratory.

[0031] Select two or more molten inorganic salts as mixed molten salts;

[0032] The molar ratio between two or more mixed molten salts is arbitrary, as long as the melting point of the mixed molten salts is not higher than 800°C.

[0033] The heating temperature is not lower than the melting point of the mixed molten salt, and the preferred heating temperature range in this application is 650-800°C.

[0034] Mix the reaction precursor, lithium salt, and mixed molten salt in a molar ratio of 1.0:1.1:x evenly, put it into a crucible, heat it to 650-800°C at a heating rate of 2-10°C / min and keep it for 2-30 Hours, naturally c...

Embodiment 1

[0040] 0.1mol precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2, 0.11mol LiOH, 0.05mol Li 2 SO 4 -Cs 2 SO 4 Mix molten salt (molar ratio 1:1, melting point about 740°C) and mix evenly, put it into a crucible, heat it to 780°C at a heating rate of 10°C / min, keep it for 15 hours, and cool it down to room temperature naturally. Washed with ionic water three times, dried in vacuum at 120°C for 3 hours, then put into a crucible, heated to 750°C at a heating rate of 10°C / min, kept for 6 hours, and cooled naturally to room temperature to obtain single crystal 811 (LiNi 0.8 mn 0.1 co 0.1 o 2 ) ternary material.

[0041] From figure 1 It can be seen that the formed ternary material has the morphology of single crystal polyhedron. From figure 2 It can be seen from the XRD data that the crystallinity is very good and the structure is highly ordered.

[0042] Electrochemical test: Mix the active material with conductive carbon and PVDF binder in NMP at a ratio of 90:5:5 and coat it on ...

Embodiment 2

[0044] 0.1mol precursor Ni 0.85 co 0.1 Al 0.05 (OH) 2.05 , 0.11mol LiOH, 0.05mol Li 2 SO 4 -K 2 SO 4 Mix molten salt (molar ratio 8:2, melting point about 530°C) and mix evenly, put it into a crucible, heat it to 750°C at a heating rate of 10°C / min, keep it for 15 hours, cool it down to room temperature naturally, and use the mixture Washed with ionic water for 3 times, vacuum dried at 120°C for 3 hours, then placed in a crucible, heated to 750°C at a heating rate of 10°C / min, kept for 6 hours, and naturally cooled to room temperature to obtain LiNi 0.85 co 0.10 Al 0.05 o 2 .

[0045] From Figure 4 It can be seen that the ternary material has the morphology of single crystal polyhedron. From Figure 5 It can be seen from the XRD data that the crystallinity is very good and the structure is highly ordered.

[0046] Electrochemical test: Mix the active material with conductive carbon and PVDF binder in NMP at a ratio of 90:5:5 and coat it on an aluminum foil. Afte...

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Abstract

The invention discloses a preparation method of a single crystal type high-nickel ternary positive electrode material. The preparation method comprises the steps of uniformly mixing a nickel-cobalt-manganese hydroxide precursor or a nickel-cobalt-aluminum hydroxide precursor with two or more than two molten inorganic salts according to a certain stoichiometric ratio, putting the mixture into a crucible, heating to a certain temperature at a preset heating rate, keeping the temperature for a period of time, and naturally cooling to room temperature; and washing the obtained mixture with deionized water for multiple times, carrying out vacuum drying at the temperature of 100-120 DEG C for several hours, then putting the mixture into the crucible, heating to a certain temperature at a presetheating rate, keeping the temperature for a period of time, and naturally cooling to room temperature to obtain the single crystal type high-nickel ternary positive electrode material. According to the preparation method, the mode of mixing two or more than two molten salts is adopted, so that the melting temperature of the molten salt is effectively reduced, the single crystal type high-nickel ternary positive electrode material can be formed in the molten salt, the phenomenon of lithium-nickel mixed arrangement is inhibited at the same time, and the nickel content in the prepared single crystal type high-nickel ternary positive electrode material is not less than 80%.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a single crystal high-nickel ternary positive electrode material. Background technique [0002] As an important energy storage device, lithium-ion batteries have been widely used in electronic products such as mobile phones and computers. Traditional lithium-ion batteries mainly use lithium cobaltate as the positive electrode material, but due to the high price and low energy density of lithium cobaltate, it is urgent to find a high energy density positive electrode material. [0003] At present, the positive electrode materials that have been studied more mainly include ternary positive electrode materials with layered structure, lithium-rich manganese-based materials, lithium manganese oxide and lithium iron phosphate, etc. Among them, nickel-cobalt lithium manganese oxide ternary positive electrode materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/44H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner 苏州拉瓦锂能源科技有限公司
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