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Single-layer PVDF battery diaphragm and preparation method thereof

A battery separator and single-layer technology, applied in the field of single-layer PVDF battery separator and its preparation, can solve the problems of inability to meet the battery process requirements, increase in thickness, etc. The effect of diaphragm interface stabilization

Pending Publication Date: 2020-06-16
盐山万兴新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to double-sided coating, the increase in thickness has limitations, which cannot meet the technical requirements of individual batteries.

Method used

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  • Single-layer PVDF battery diaphragm and preparation method thereof

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preparation example Construction

[0023] A preparation method for a single-layer PVDF battery diaphragm, comprising the following steps:

[0024] S1. Preparation of PVDF coating: Weigh the amount of polyvinylidene fluoride W#8500, polyvinylidene fluoride-hexafluoropropylene copolymer and acetone into the stirring reactor, and heat it with water at 30°C-80°C After one hour until it is completely melted, after stirring for one hour at room temperature in a stirring reactor, add a certain amount of n-propanol, dimethyl carbonate, and cyclohexane, and stir for one hour to obtain a single-layer PVDF coating product;

[0025] S2. Coating: Put the PVDF coating obtained in step S1 into the glue tank of the coater through the pipeline, and coat the upper end of the base film at a coating speed of 5-15m / min. During the process of the coater, use an appropriate amount of Air volume, wind speed for drying.

[0026] Preferably, in step S1, the rotating speed of the stirred reactor is 50-80r / min.

[0027] Preferably, in s...

Embodiment 1

[0029] PVDF coating is prepared from the following raw materials by mass: polyvinylidene fluoride W#85000.5-3.0Kg, polyvinylidene fluoride-hexafluoropropylene copolymer 3Kg, acetone 200Kg, n-propanol 7.5Kg, dimethyl carbonate 6Kg, cyclohexane 1Kg, isopropanol 0.5Kg.

[0030] Further, the thickness of the ceramic layer 2 is 0.5 mm; the thickness of the PVDF coating layer 3 is 0.5 mm.

Embodiment 2

[0032] PVDF coatings are prepared from the following raw materials by mass: polyvinylidene fluoride W#8500 1.5Kg, polyvinylidene fluoride-hexafluoropropylene copolymer 5Kg, acetone 300Kg, n-propanol 11Kg, dimethyl carbonate 11Kg, Cyclohexane 5Kg, isopropanol 1.5Kg.

[0033] Further, the thickness of the ceramic layer 2 is 5 mm; the thickness of the PVDF coating layer 3 is 2.5 mm.

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Abstract

The invention discloses a single-layer PVDF battery diaphragm and a preparation method thereof. The PVDF battery membrane comprises a base membrane, a ceramic layer arranged at the lower end of the base membrane and a PVDF coating layer coated at the upper end of the base membrane. The PVDF coating is prepared from the following raw materials in parts by mass: 0.5 to 3.0 Kg of polyvinylidene fluoride W # 8500, 3 to 6.5 Kg of a polyvinylidene fluoride-hexafluoropropylene copolymer, 200 to 400 Kg of acetone, 7.5 to 15 Kg of n-propanol, 6 to 15 Kg of dimethyl carbonate, 1 to 8 Kg of cyclohexane and 0.5 to 2 Kg of isopropanol. The single-layer PVDF battery diaphragm is small in thermal deformation and good in thickness uniformity. The gel electrolyte plays a role in bonding, and the lithium ion conduction performance is good. The battery is good in hardness and integrally bonded, and the pole piece and diaphragm interface is stable. The gel locks the electrolyte, so that the middle and later period circularity is good. Compared with oily double-sided coating, the coating is thinner. The liquid content is increased under the same volume. The wettability is good. The electricity storagecapacity is obviously improved, and the safety coefficient is obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a single-layer PVDF battery diaphragm and a preparation method thereof. Background technique [0002] With the development of my country's economy, the effective use of energy and the reduction of environmental pollution, the state guides and insists on combining the cultivation of industries with the strengthening of supporting facilities, with the vehicle as the leader, cultivating and driving the accelerated development of power batteries. The development of new energy vehicles is an effective way to reduce vehicle fuel consumption, alleviate the contradiction between fuel supply and demand, reduce exhaust emissions, and improve the atmospheric environment. PVDF oily single-sided coating technology is applied to power and consumer soft pack batteries, which can improve the safety and reliability of batteries. And lightweight, effectively promoting the ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/409H01M50/414
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 张国峰
Owner 盐山万兴新能源有限公司
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