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A kind of preparation method of lithium ion battery pole piece

A lithium-ion battery, pole piece technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting battery charge and discharge performance, increasing electrolyte concentration gradient, insufficient active material capacity, etc. Effects of discharge performance and low temperature performance, improved mass specific capacity, and increased porosity

Active Publication Date: 2016-04-13
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, increasing the compaction density of the pole piece will reduce the porosity in the pole piece, which will lead to the deterioration of the electrolyte absorption capacity of the pole piece, and the poor circulation of the electrolyte in the pole piece, which will affect the charge and discharge performance of the battery. Such as increased polarization, low temperature precipitation of lithium dendrites, etc.
[0005] However, if the method of increasing the thickness of the pole piece is adopted, the concentration gradient of the electrolyte between the surface layer of the pole piece and the inner layer of the pole piece will be increased, which will lead to an increase in the polarization of the lithium-ion battery during charging and discharging, and the capacity of the active material will not be fully utilized. Fully wait

Method used

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  • A kind of preparation method of lithium ion battery pole piece
  • A kind of preparation method of lithium ion battery pole piece
  • A kind of preparation method of lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] As described above in the manufacturing process of lithium-ion batteries, lithium cobalt oxide (LiCoO 2 ) as the positive electrode active material, polyvinylidene fluoride (PVDF) is used as the binder, and conductive carbon black is selected as the conductive agent. After the mixed slurry is coated on both sides of the positive electrode current collector made of aluminum foil, it is dried to obtain Positive electrode sheet, then the electrode sheet to be treated and the PP material porous film with a thickness of 20um are pressed together on the roller machine 3, so that the compacted density of the positive electrode sheet is 4.1g / cm 3 , and then remove the porous membrane to obtain the positive sheet.

[0047] High-energy-density graphite is used as the negative electrode active material, SBR (polystyrene, butadiene suspension) is used as the binder, CMC (sodium carboxymethylcellulose) is used as the thickener, and conductive carbon black is used as the conductive a...

Embodiment 2～9

[0050] The positive electrode active material, negative electrode active material, buffer material layer material and pole piece compaction density used in Examples 2 to 9 are shown in Table 1. For the specific preparation process, please refer to the preparation of the positive electrode sheet, the preparation of the negative electrode sheet, and the electrolysis process described in the above paragraphs. Liquid composition and assembly testing process.

[0051] Table 1: The positive and negative active materials used in Examples 2 to 9, the material of the buffer material layer and the compaction density of the pole piece and the test results

[0052]

[0053] Simultaneously, the positive electrode sheet and the negative electrode sheet of embodiment 2~9 are tested as follows:

[0054] Drop 50uL electrolyte solution on the surface of the pole piece (the solvent is a mixture of ethylene carbonate and ethyl methyl carbonate with a mass ratio of 1:1, and the solute is 1MLiPF...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium ion battery pole piece. The method comprises the following steps of: coating paste containing active substances on a current collector and drying to obtain a pole piece to be treated; placing a buffer material layer on at least one surface of the pole piece to be treated; pressing the pole piece which has the buffer material layer and is to be treated through a compression roller; and separating the buffer material from the pole piece. Compared with the prior art, in the preparation method disclosed by the invention, pores on the surface of the pole piece can be effectivley protected as the surface of the pole piece is equipped with the buffer material layer in the compacting process, so that lithium ions can more smoothly pass in the pole piece. The lithium ion battery made from the pole piece prepared by the method is significantly improved in electrochemical performance, such as the mass specific capacity of the active substances and the low-temperature lithium branch crystallization precipitation; and as the pole piece becomes thicker, the battery made by the method is improved more significantly in performance and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically, the invention relates to a preparation method of lithium ion battery pole pieces with large surface porosity. Background technique [0002] In recent years, major battery terminal manufacturers are competing to launch a variety of thin, flat-shaped electronic products, such as ipad, iphone, music phone and kindle. With the increasing experience requirements of consumer groups for electronic products, electronic terminal manufacturers have endowed electronic products with richer functions, and the display screens of products have become larger and larger. As a result, mobile power banks are required to be ultra-thin. At the same time keep the energy high. Judging from the current market, lithium-ion batteries are the most widely used rechargeable and dischargeable power sources for mobile electronic terminals. Many lithium-ion battery manufacturers are also c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139
CPCY02E60/10
Inventor 袁庆丰陈小波尚玉芬
Owner NINGDE AMPEREX TECH
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