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Surface treated lithium-ion battery positive electrode active material substance and preparation method and application thereof

A lithium-ion battery and cathode active technology, which is applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as complex processes, affecting the electronic conductivity of active material particles, and difficulty in ensuring coating uniformity. Effects of reduced deterioration, wide application, and improved conductivity

Inactive Publication Date: 2019-06-07
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are that the process is complicated, the coating uniformity is difficult to guarantee, and the coating layer affects the electronic conductivity between the active particles.
However, this method obviously cannot block the contact between the positive electrode active material and the electrolyte, and the deterioration of the positive electrode is still inevitable (patent CN 102412396 B)

Method used

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  • Surface treated lithium-ion battery positive electrode active material substance and preparation method and application thereof
  • Surface treated lithium-ion battery positive electrode active material substance and preparation method and application thereof
  • Surface treated lithium-ion battery positive electrode active material substance and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0053] Preparation of lithium ion battery electrode slurry:

[0054] The preparation of the electrode slurry of the present invention is prepared according to a conventional method, wherein the mass ratio of each component is: the compound of the positive electrode active material and carbon material through the surface treatment of lithium ion battery: polyvinylidene fluoride: conductive carbon black=100: 5:1.5. The solvent used in the electrode slurry is NMP.

[0055] Lithium-ion battery performance test:

[0056] The lithium-ion battery assembled with the electrode paste prepared by the above method was tested for charge and discharge performance at 1C rate. Evaluation of the degree of deterioration of the positive electrode active material after the charge and discharge test:

[0057] After the lithium ion battery assembled with the electrode paste prepared by the above method was subjected to battery charge and discharge test for 300 cycles, a scanning transmission ele...

Embodiment 1

[0059] Under room temperature conditions, the nickel-cobalt-manganese ternary material of the positive electrode active material and the compound diethylenetriamine having an amine structure are uniformly mixed in water, kept for 1 minute, and dried to obtain the surface-treated positive electrode active material of the lithium ion battery.

[0060] Wherein the mass ratio of the positive electrode active material to the compound having an amine structure is 100:0.1.

[0061] The surface-treated lithium ion battery cathode active material is mixed with carbon nanotubes and graphene oxide in a solution to obtain a compound after purification. The mass ratio of the surface-treated lithium-ion battery cathode active material to the carbon material is 100:0.1. The composite surface has a complete and uniform coating layer.

[0062] The lithium-ion battery using the composite has a retention rate of 97% after 100 cycles through charge and discharge tests.

Embodiment 2

[0064] Under room temperature conditions, the nickel-cobalt-manganese ternary material of the positive electrode active material and the compound triethylenetetramine having an amine structure are uniformly mixed in ethanol, kept for 1 minute, and dried to obtain a surface-treated lithium ion battery positive electrode active material.

[0065] Wherein the mass ratio of the positive electrode active material to the compound having an amine structure is 100:5.

[0066] The surface-treated lithium ion battery cathode active material is mixed with carbon nanotubes, graphene oxide and graphene in a solution to obtain a compound after purification. The mass ratio of the surface-treated lithium-ion battery cathode active material to the carbon material is 100:5. The composite surface has a complete and uniform coating layer.

[0067] The lithium-ion battery using the composite has been tested for charging and discharging, and the retention rate after 100 cycles can reach 98%.

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Abstract

The invention provides a positive electrode active substance modified by positive ionization and a preparation method. It is easy to form a carbon material coating on the surface so as to obtain a positive electrode active substance compound with a carbon material protective layer on the surface. Meanwhile, the invention further provides a lithium-ion battery applying the compound, which reduces the contact between a positive electrode active material and an electrolyte and the side reaction, can obtain a stable capacity retention rate and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a surface-treated lithium ion cathode active material and a preparation method thereof. [0002] Simultaneously, the present invention belongs to the field of graphene materials, in particular to a compound obtained by coating graphene with the surface-treated lithium ion battery cathode active material of the present invention and a lithium ion battery containing the compound, especially a compound with Li-ion battery with high cycle performance. Background technique [0003] Lithium-ion batteries have been widely used in electronic products, automobiles and other fields in recent years. At the same time, various applications continue to put forward higher requirements for the performance of lithium-ion batteries. One of the problems that need to be solved urgently is how to improve the service life of lithium-ion batteries, that is, to improve the cycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/36H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 杜宁赵太志
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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