Lithium battery pole piece and preparation method and application thereof

A lithium battery and pole piece technology, applied in the field of lithium battery pole pieces and their preparation, can solve the problems of easy deposition of lithium, piercing of lithium battery separator, large volume expansion, etc.

Inactive Publication Date: 2021-08-31
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the active material of the pole piece will undergo a large volume expansion during the charging and discharging process. At the same time, lithium is easy to deposit during long-term use, forming lithium dendrites, which may pierce the lithium battery diaphragm. Therefore, the cycle performance of the lithium battery pole piece , poor security

Method used

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  • Lithium battery pole piece and preparation method and application thereof
  • Lithium battery pole piece and preparation method and application thereof

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preparation example Construction

[0048] An embodiment of the present invention also provides a method for preparing the above-mentioned lithium battery pole piece, including the following steps S110-S150.

[0049] Step S110: Mix the active material, the binder, the conductive agent and the electrode solvent to obtain the active material slurry.

[0050] Step S120: the active substance slurry is uniformly coated on the surface of the current collector, dried, and rolled to obtain a slurry membrane.

[0051] Step S130: uniformly coating the adhesive on the slurry film and drying to obtain an adhesive film with an adhesive layer.

[0052] Step S140: Mix the ceramic powder, dispersant, binder and ceramic solvent, and sieve to obtain a ceramic slurry.

[0053] Step S150: coating the ceramic slurry on the surface of the adhesive membrane, and drying to obtain a lithium battery pole piece.

[0054] The preparation method of the above-mentioned lithium battery pole piece has simple process, low manufacturing cost, ...

Embodiment 1

[0061] The positive pole piece is prepared according to the following steps:

[0062] (1) Add 96.5 parts of NCM622, 0.5 part of conductive carbon black, 1 part of carbon nanotube (hereinafter referred to as CNT), and 2 parts of polyvinylidene fluoride (hereinafter referred to as PVDF) to 33.8 parts of N-methyl Stir evenly in pyrrolidone (hereinafter referred to as NMP) to prepare a uniform positive electrode slurry, and then coat the uniform positive electrode slurry on both sides of a 12 μm aluminum foil, and press 3.5g / cm2 after drying. 3 The compacted density is rolled to obtain the positive electrode sheet.

[0063] (2) Add 10 parts of PVDF into 90 parts of NMP and stir evenly according to parts by mass to prepare a uniform binder slurry. The binder slurry is sprayed on the surface of the positive electrode sheet by means of spin spraying, and then dried to obtain a positive electrode sheet with a binder cluster layer. The binder clusters are distributed in an island sha...

Embodiment 2

[0066] This embodiment is a change made on the basis of Embodiment 1. The difference with Embodiment 1 is that the percentage of the positive electrode sheet binder cluster layer in Embodiment 2 to the surface area of ​​the positive active coating film is 15%, and the viscosity per unit area is 15%. The mass of the cluster layer is 0.5g / m 2 .

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Abstract

The invention relates to a lithium battery pole piece and a preparation method and application thereof. The lithium battery pole piece comprises a current collector, an active matter layer, a bonding layer and a ceramic coating, wherein the bonding layer is provided with a plurality of bonding clusters, and the bonding clusters are randomly and uniformly distributed on the surface of the active matter layer. The ceramic coating provides a porous structure for the surface of the lithium battery pole piece, so that the phenomenon that lithium dendrites formed by depositing lithium on the surface of the active matter layer pierce a lithium battery diaphragm in a long-term use process can be effectively avoided, and the safety of a lithium battery is improved. The bonding layer is randomly and uniformly distributed on the surface of the active matter layer in the form of bonding clusters, so that the active matter layer and the ceramic coating can be effectively bonded together, and meanwhile, ion transmission between the active matter layer and the ceramic coating is not influenced, so that the charge-discharge cycle performance of the lithium battery is improved. The lithium battery adopting the lithium battery pole piece is good in charge-discharge cycle performance and high in safety.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery pole piece and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are a type of batteries that use materials containing lithium elements as electrodes and rely on lithium ions to move between the positive and negative electrodes to work. Lithium-ion battery is a kind of lithium battery with many advantages such as high energy density, high power density and long cycle life, so it has received great attention in the fields of portable electronic devices, power batteries and energy storage batteries. As the market's performance requirements for vehicle-mounted lithium-ion batteries are getting higher and higher, relevant technical personnel have been committed to improving and changing the energy density, cycle life and safety issues of lithium batteries, and the safety of lithium batteries has become our to...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/0525
CPCH01M4/13H01M4/623H01M4/628H01M4/139H01M10/0525Y02E60/10
Inventor 赵小欢刘冯新娄永文李奎张明杰
Owner 昆山聚创新能源科技有限公司
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