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Lithium ion battery pole piece and preparation method thereof

A lithium ion battery and pole piece technology is applied in the field of lithium ion battery pole pieces and their preparation, which can solve the problems of short driving range of electric vehicles, low compaction density of negative electrode pieces, low battery energy density, etc., and can meet the requirements of fast charging and discharging. and service life requirements, changing the charge migration path, improving the rate charge and discharge performance and the effect of cycle life

Inactive Publication Date: 2019-04-26
遵化市清吉电池科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery pole piece and its preparation method to solve the problems of low compaction density, slow liquid absorption and insufficient liquid retention of the traditional negative pole piece, resulting in low energy density of the battery and short cruising range of the electric car. , poor rate performance, long charging time, poor safety performance, short cycle life and low production efficiency technical problems

Method used

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

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preparation example Construction

[0033] The preparation method of above-mentioned lithium ion battery pole piece comprises the following steps:

[0034] Step 1, adding the active material, the binder and the conductive agent into the solvent, stirring evenly to obtain a mixture slurry.

[0035] Step 2: Coating the slurry evenly on both sides of the current collector (1), drying and rolling to obtain lithium-ion battery pole pieces.

[0036] Step 3: Using mechanical punching or laser punching, uniformly punch micropores (3) on the slurry membrane (2) to obtain a lithium ion battery pole piece with micropores.

[0037] The mechanical punching equipment was purchased from Changsha Lianeng Electronic Technology Co., Ltd., and the equipment model is LE-CK300-50. When the equipment is used for punching, the technical parameters of the control equipment are specifically: the diameter of the mold needle is 0.01-0.1mm, and the length is 5mm or 7mm. Mold hole density is 3-50 holes / mm 2 , the effective punching width...

Embodiment 1

[0040] Add artificial graphite, conductive graphite, sodium carboxymethyl cellulose, and styrene-butadiene rubber into high-purity deionized water and stir evenly to prepare a uniform mixture slurry, and then coat the uniform mixture slurry on the surface of copper foil. Dried in an oven, according to 1.4g / cm 3 The compacted density is rolled to obtain the negative electrode sheet. Then, the negative pole piece is punched, and circular micropores (3) are uniformly punched out on the slurry membrane (2), so as to obtain a lithium ion battery negative pole piece with micropores. The measurement results of the physical parameters of the pole piece are shown in Table 1. Then add lithium iron phosphate, acrylic acid, styrene-butadiene rubber, and conductive graphite into high-purity deionized water and stir evenly to prepare a uniform mixture slurry, and then coat the uniform mixture slurry on the surface of the aluminum foil. Dried in an oven, according to 2.3g / cm 3 The compact...

Embodiment 2

[0042]Add mesophase carbon microspheres, carbon nanotubes, and polyvinylidene fluoride into N-methylpyrrolidone and stir evenly to prepare a uniform mixture slurry, and then coat the uniform mixture slurry on the surface of the three-dimensional copper foil. Dried in an oven, according to 1.6g / cm 3 The compacted density is rolled to obtain the negative electrode sheet. Then, the negative pole piece is punched, and triangular micropores (3) are evenly punched out on the slurry membrane (2), so as to obtain the lithium ion battery negative pole piece with micropores. The measurement results of the physical parameters of the pole piece are shown in Table 1. Then add the ternary material, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, and carbon nanotubes into N-methylpyrrolidone and stir evenly to prepare a uniform mixture slurry, and then mix the uniform mixture slurry Coated on the surface of three-dimensional aluminum foil. Dried in an oven, according...

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Abstract

The invention discloses a lithium ion battery pole piece which comprises a current collector and a paste membrane applied to the current collector. The paste membrane is uniformly provided with micropores, and the micropores penetrate through the surfaces of two sides of the paste membrane. According to the battery pole piece, the paste membrane on the lithium battery pole piece is provided with aplurality of micropores, so that the conductive interface of active substances in a lithium ion battery is increased, the interface resistance is reduced, the absorption efficiency and the liquid retention amount are improved, the rate charge-discharge performance and the cycle life of poles are improved, and the requirements for rapid charge-discharge and the service life of the power battery are met. In addition, the thickness of the pole piece is increased, the energy density of the battery and the safety performance of the battery are improved, meanwhile, the charge transfer path betweenthe pole pieces is changed, the production efficiency is improved, and the manufacturing cost of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery pole piece and a preparation method thereof. Background technique [0002] Lithium-ion battery is a high-tech product. In addition to being used in the IT industry, it is mainly used in mining vehicles, electric vehicles, electric bicycles, electric motorcycles, electric track vehicles, clean energy storage and other fields. Its research and development, production and sales With the strong support of national policies, the domestic industrial chain is mature and the market is growing rapidly. [0003] However, the technology currently used is still limited to the traditional non-porous negative electrode sheet electrode lithium-ion battery manufacturing. Due to the low compaction density of the negative electrode sheet, slow liquid absorption, and insufficient liquid retention, the battery energy density is low and the driving range of the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04
CPCH01M4/0433H01M4/13H01M4/139Y02E60/10
Inventor 赖见杜洪彦陈星宇桂怀龙
Owner 遵化市清吉电池科技有限公司
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