Lithium ion battery film in situ preparation method, lithium ion battery film, and lithium ion battery

A lithium-ion battery, in-situ preparation technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of low longitudinal tensile strength of nanofiber films, difficult lamination and winding, and low puncture strength, etc. Achieve good thermal stability, avoid weak adhesion, and easily adjust the thickness

Active Publication Date: 2013-05-08
河南曼博睿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the diaphragm prepared by the preparation method disclosed in the above-mentioned patent or patent application documents also requires the process of lamination or winding to place the diaphragm between the positive electrode and the negative electrode, but the nanofibrous film produced by electrospinning has relatively low transverse and longitudinal tensile strength. Small size, low puncture strength, and high static electricity bring great difficulties to lithium-ion battery manufacturers in lamination and winding, and also limit the development of nanofiber separators produced by electrospinning in the lithium-ion battery industry

Method used

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  • Lithium ion battery film in situ preparation method, lithium ion battery film, and lithium ion battery
  • Lithium ion battery film in situ preparation method, lithium ion battery film, and lithium ion battery
  • Lithium ion battery film in situ preparation method, lithium ion battery film, and lithium ion battery

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Embodiment 1

[0028] Taking the preparation of a lithium-ion battery film with a PVDF separator as an example, the in-situ preparation method of the present invention is further described.

[0029] Select the intrinsic viscosity as 5.0-15 10 2 mL / g, PVDF resin with a rotational viscosity of 2.5-7.5Pa·s and a moisture content of not more than 0.2% is used to prepare a polyvinylidene fluoride solution with a weight concentration of 7.2%. Coating LiFePO on the surface of metal aluminum foil 4 The electrode sheet is conveyed circularly between the discharge roller and the take-up roller, and the electrode sheet conveying speed is 100cm / min. The electric field strength applied between the nozzle and the take-up roller is 1500V / cm, the distance is 15cm, and the moving speed of the nozzle is 20-50cm / min; through the tension adjustment mechanism, the vertical section of the coating area is controlled to maintain the roller ratio of the vertical section of the coating area to maintain the tension o...

Embodiment 2

[0031] Compared with Example 1, the only difference is that LiFePO is coated on the surface of metal aluminum foil 4 Before the glow discharge treatment was carried out on the aluminum foil, the conditions of the glow discharge treatment were: the background vacuum degree was 5.0 10 -3 Pa, under the conditions of DC voltage 150V and current 0.5A, use argon gas to generate glow discharge treatment for 5min. The prepared film has uniform thickness, uniform pore distribution, 45% porosity, good thermal stability, and two-way shrinkage < 0.6% when kept at 90° C. for 4 hours.

Embodiment 3

[0033] Compared with Embodiment 2, the only difference is that the heat treatment device is an electron beam curing device. The prepared film has uniform thickness, uniform pore distribution, porosity of 52%, good thermal stability, and two-way shrinkage <0.5% when kept at 90° C. for 4 hours.

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Abstract

The present invention relates to a lithium ion battery film in situ preparation method, which comprises the following steps: preparing a metal substrate, and coating a lithium ion positive electrode film material or a lithium ion negative electrode film material on the surface of the metal substrate; preparing a polymer solution raw material, adopting a direct current high voltage power supply to spray the polymer solution on the treated metal substrate surface in an electrostatic spinning device to form a nanometer fiber separation film; and carrying out a curing treatment on the treated metal substrate in a heat treatment device to obtain the lithium ion battery film prepared in an in situ manner. With the method, the separation film material can be prepared on the lithium ion battery substrate coated with the positive electrode film material or the negative electrode film material in the in situ manner, such that the technical problem of poor adhesion between the separation film and the positive electrode film material or the negative electrode film material is completely solved, the progression that the nanometer fiber film prepared by the electrostatic spinning method enters the lithium ion battery industry is accelerated, and charge and discharge performance and safety of the lithium ion battery are substantially increased.

Description

technical field [0001] The present invention relates to a preparation method of a lithium-ion battery film and the lithium-ion battery film and battery prepared by the method. More specifically, the present invention relates to a continuous and simultaneous coating on the surface of a lithium-ion battery positive electrode or negative electrode substrate. The method for the nanofiber separator, and the prepared lithium ion battery film and the battery. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, PDAs, digital cameras, MP3 and other fields because of their advantages such as high working voltage, high energy density, long cycle life, small self-discharge, no memory effect and low environmental pollution. , has become an indispensable part of various modern communication equipment and electronic equipment. [0003] With the renewal and development of technology, the development of various electrical equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 孙志峰荆彦超
Owner 河南曼博睿新材料科技有限公司
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