Lithium ion battery electrode piece, preparation method thereof, and lithium ion battery

A lithium-ion battery and pole piece technology, applied in the field of lithium-ion battery pole piece and its preparation, can solve the problems of increasing the difficulty of lithium ion transmission, tortuous lithium ion conduction path, and poor battery power performance, so as to enhance ion conductivity , Facilitate transmission and reduce the effect of steric hindrance

Active Publication Date: 2019-06-07
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium ions cannot pass through the two-dimensional plane of graphene, so the planar structure of graphene will have a steric effect on the transmission of lithium ions. With graphene as the conductive agent, the conduction path of lithium ions is more tortuous, and ion conduction Poorer than conductive carbon black
Especially when charging and discharging at a higher rate, the steric hindrance effect of graphene will greatly increase the difficulty of lithium ion transmission, making the power performance of the battery worse.

Method used

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  • Lithium ion battery electrode piece, preparation method thereof, and lithium ion battery
  • Lithium ion battery electrode piece, preparation method thereof, and lithium ion battery
  • Lithium ion battery electrode piece, preparation method thereof, and lithium ion battery

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preparation example Construction

[0036] Embodiments of the present invention provide a method for preparing lithium-ion battery pole pieces on the one hand, figure 1 It is a schematic flow chart of the preparation method, comprising the following steps:

[0037] (1) Prepare slurry 2: mix electrochemically active material, graphene or graphene and carbon black, dispersant, binder and solvent, and stir to form slurry 2;

[0038] (2) Slurry coating: coating the prepared slurry 2 on the current collector 1 and drying the coating to obtain a dried pole piece;

[0039] (3) Plasma etching: use plasma etching equipment 5 to etch the dried pole piece at room temperature, and the plasma etching equipment includes a gas supply system 54, an etching chamber 51 and a vacuum system 55; Etching includes the following steps:

[0040] Transfer the pole piece into the etching chamber 51 and contact the lower electrode 52 in the etching chamber 51, seal the etching chamber 51 and evacuate it;

[0041] The gas supply system 5...

Embodiment 1

[0066] (1) Preparation of slurry: Add 0.5g of PVP to 10g of NMP, stir until PVP is fully dissolved, then add 1g of graphene, stir evenly to obtain a graphene dispersion; add 2g of PVDF to 40g of NMP, at 100rmp Stir at a low speed for 30 minutes until the PVDP is fully dissolved, add half of the graphene dispersion to it, stir at a speed of 100rmp for 10 minutes, then slowly add 46.5g of lithium iron phosphate while stirring, continue stirring at a low speed for 30 minutes after all the lithium iron phosphate is added, and then Add the remaining other half of the graphene dispersion, and stir at a high speed of 2000rmp for 2h; after fully dispersing, vacuumize the system and stir at a low speed of 100rmp for 30min to eliminate the air bubbles in the slurry; take out the slurry, and measure the viscosity to be about 6000cP. Sieve and set aside.

[0067] (2) Slurry coating: Transfer the prepared slurry to an automatic coating machine, select a 20 μm thick aluminum foil as a curre...

Embodiment 2

[0072] (1) Preparation of slurry: add 1g of PVP to 10g of NMP, stir until the PVP is fully dissolved, then add 2g of graphene, stir evenly to obtain a graphene dispersion; add 2g of PVDF into 40g of NMP, at a low speed of 100rmp Stir for 30 minutes until the PVDP is fully dissolved, add half of the graphene dispersion to it, stir at 100rmp for 10 minutes, then slowly add 50g of lithium iron phosphate while stirring, continue stirring at a low speed for 30 minutes after all the lithium iron phosphate is added, and then add the remaining The other half of the graphene dispersion was stirred at a high speed of 2000rmp for 2h; after fully dispersed, the system was vacuumed and stirred at a low speed of 100rmp for 30min to eliminate the air bubbles in the slurry; the slurry was taken out and the viscosity was measured to be 7000cP, and sieved for later use .

[0073] (2) Slurry coating: Transfer the prepared slurry to an automatic coating machine, select a 20 μm thick aluminum foil...

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Abstract

The invention provides a lithium ion battery electrode piece, a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method of the lithium ion battery electrode piece comprises the following steps: (1) slurry preparing; (2) slurry coating; (3) plasma etching: etching a dried electrode piece by adopting plasma etching equipment at room temperature, and forming a hole perpendicular to the surface of the electrode piece in the coating; (4) rolling and winding of the etched electrode piece for later use. The graphene, distributed in the horizontal direction, in the electrode piece is selectively etched through a plasma etching method, so that the transmission of lithium ions in the electrode piece is facilitated, the steric hindrance effect of the graphene is reduced, and the ionic conductivity of the lithium ion battery electrode piece is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] As a chemical power source, lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and have been widely used in the fields of electric vehicles and mobile electronic devices. However, lithium-ion batteries often take a long time to charge, which cannot meet the fast charging requirements of electric vehicles and electronic equipment, which limits the wide application of lithium-ion batteries to a large extent. [0003] An important factor affecting the power performance of the battery is the conductive agent in the positive and negative electrodes. Currently, common conductive agents include conductive carbon black, graphite, carbon nanotubes, and graphene. Among them, graphene has att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 秦瑞杰张愔郝玉福郝保磊汤劲松
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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