A kind of lithium battery cathode material precursor with mesoscopic structure and preparation method thereof

A positive electrode material and mesoscopic structure technology, applied in the field of lithium battery positive electrode material precursors and its preparation, can solve the problem of not being able to prepare lithium nickel cobalt manganese quaternary precursors with mesoscopic structure, and achieve the promotion of particle adhesion and crystallization effect, benefit to rate performance, effect of production cost reduction

Active Publication Date: 2022-01-25
尤尼瑞克科技(成都)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned deficiencies in the prior art, the present invention provides a lithium battery anode material precursor with a mesoscopic structure and a preparation method thereof, which can effectively solve the lithium nickel cobalt manganese tetrachloride with a mesoscopic structure that cannot be prepared by existing methods The problem with meta-precursors

Method used

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  • A kind of lithium battery cathode material precursor with mesoscopic structure and preparation method thereof
  • A kind of lithium battery cathode material precursor with mesoscopic structure and preparation method thereof
  • A kind of lithium battery cathode material precursor with mesoscopic structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] A preparation method of a lithium battery cathode material precursor with a mesoscopic structure, comprising the following steps:

[0040] (1) Solution deployment: the lithium sulfate solid soluble in water and deionized water are made into the lithium salt solution that concentration is 5mol / L; Lithium hydroxide solid and deionized water are made into the hydroxide that concentration is 5mol / L Lithium solution; water-soluble nickel sulfate, cobalt sulfate, manganese sulfate solid according to Ni 2+ :Mn 2+ :Co 2+ The molar ratio was 5:2:3, and then the mixture was dissolved in deionized water to form a mixed solution of manganese, cobalt and nickel salts with a concentration of 4 mol / L.

[0041] (2) One-time co-synthesis reaction: Add the mixed solution of nickel-cobalt-manganese salt and lithium salt solution obtained in step (1) into the synthesis reaction device with stirring and heating, and add the solution to the solution according to the 2m 3 The flow rate of / h...

Embodiment 2

[0048] A preparation method of a lithium battery cathode material precursor with a mesoscopic structure, comprising the following steps:

[0049] (1) Solution preparation: water-soluble lithium chloride solid and deionized water are made into lithium salt solution with a concentration of 9mol / L; lithium hydroxide solid and deionized water are made into hydrogen with a concentration of 6mol / L Lithium oxide solution; water-soluble nickel chloride, cobalt chloride, manganese chloride solid according to Ni 2+ :Mn 2+ :Co 2+ The molar ratio was 6:2:2, and then the mixture was dissolved with deionized water to form a mixed solution of manganese, cobalt and nickel salts with a concentration of 5 mol / L.

[0050] (2) One-time co-synthesis reaction: add the mixed solution of nickel-cobalt-manganese salt and lithium salt solution obtained in step (1) into the synthesis reaction device with stirring and heating, 3 The flow rate of / h is fed into carbon dioxide gas, and the pH automatic ...

experiment example

[0059] The precursors prepared in Example 1, Example 2 and Comparative Example were respectively used as raw materials to prepare lithium battery positive electrodes, and then according to the non-ferrous metal industry standard of the People's Republic of China (YST 798-2012), it was tested for charge and discharge performance. The results are shown in Table 1.

[0060] Table 1 Lithium battery cathode charging performance

[0061]

[0062] From the data in Table 1, it can be seen that the performance of the positive electrodes of lithium batteries prepared using the precursors prepared in Example 1 and Example 2 of the present invention as raw materials is almost the same, and both are higher than the industry standard, and are far better than the comparative example, which shows that , only with the cooperation of the method and process conditions of the present invention, can the lithium-nickel-cobalt-manganese quaternary precursor with nanoscale and mesoscopic structure...

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Abstract

The invention discloses a lithium battery cathode material precursor with a mesoscopic structure and a preparation method thereof. The method comprises the following steps: (1) one-step co-synthesis: mixing the lithium salt solution and the nickel-cobalt-manganese mixed solution, adjusting the pH value to 5.5-7.5 through a carbon dioxide-lithium hydroxide buffer system, and stirring for 2-5 hours; (2 ) Two-step co-synthesis: Concentrate the product obtained in step (1) until the volume is reduced by 1 / 2 to 2 / 3, pass through protective gas to maintain the pressure at 1.01 to 10.0 MPa, and then perform solid-liquid separation after aging for 5 to 24 hours , to collect the solid phase product; (3) pyrolyze the solid phase product in a vacuum, and then dry it at 90-130°C. The reaction process of the present invention does not require an external complexing agent, and a nano-scale, independent lithium-nickel-cobalt-manganese quaternary precursor spherical particle with a mesoscopic structure can be prepared, which simplifies reaction control and reduces production costs.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery cathode material precursor with a mesoscopic structure and a preparation method thereof. Background technique [0002] Benefiting from the promotion of the new energy vehicle industry policy, China is already the world's largest electric vehicle market. The automotive lithium-ion power battery market is coming out of the introduction period and entering a period of rapid growth. In the next few years, the largest driving force for the growth of the lithium-ion battery market will undoubtedly come from the electric vehicle market. The global production of lithium-ion power batteries and their materials is mainly concentrated in China, Japan and South Korea. The main cathode materials include modified lithium manganate, nickel-cobalt lithium manganate or nickel-cobalt lithium aluminate. The demand for high-energy-density lithium-ion power b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCC01G53/006H01M4/505H01M4/525Y02E60/10
Inventor 任燕邹廷军
Owner 尤尼瑞克科技(成都)有限公司
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