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High-tensile-strength polyester film for lithium battery current collector and preparation method thereof

A high tensile strength, polyester film technology, applied in the field of polyester film, can solve the problems of reduced mechanical strength, reduced processing performance, reduced thickness of aluminum foil, etc., to achieve increased strength, improved orientation and crystallinity, and small heat shrinkage Effect

Active Publication Date: 2021-10-22
浙江南洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the development of lithium battery technology, the high energy density, light weight and flexibility of lithium ion batteries have become people's pursuit, and how to reduce the quality and cost of lithium batteries is a problem that needs to be continuously optimized in the industry; Limitations, the thickness of the aluminum foil is difficult to reduce; in addition, after the aluminum foil becomes thinner, the mechanical strength decreases, resulting in a decrease in processing performance, so a new thinning technology is required

Method used

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  • High-tensile-strength polyester film for lithium battery current collector and preparation method thereof
  • High-tensile-strength polyester film for lithium battery current collector and preparation method thereof
  • High-tensile-strength polyester film for lithium battery current collector and preparation method thereof

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preparation example Construction

[0040] A preparation method of a high tensile strength polyester film for a lithium battery current collector, comprising the following steps:

[0041] S1 raw material preparation ratio: prepare the raw materials of the surface layer A and the raw materials of the core layer B;

[0042] S2 Extrusion Casting: Put the raw material of the surface layer A into the auxiliary extruder and melt it at 265-285°C, add the raw material of the core layer B into the main extruder and melt it at the temperature of 275-295°C, pass through the metering pump and filter It is transported to the distributor, and is divided into ABA three-layer structure co-extrusion through the distributor and the special die head. Composite casting on a cold drum at a temperature of 20°C;

[0043]S3 Synchronous Stretching Film Production: Afterwards, the composite cast sheets are sent to the synchronous stretching oven respectively, and the preheating temperature of the oven is 90-110°C, and then at the temper...

Embodiment 1

[0048] S1 material preparation ratio:

[0049] Surface layer A: The raw material composition of the surface layer A includes: 50% raw material A, 40% raw material B, 10% raw material C in terms of mass percentage;

[0050] Core layer B: The raw material composition of the core layer B includes: 90% raw material A, 10% raw material C in terms of mass percentage;

[0051] Wherein, raw material A is high-viscosity polyethylene terephthalate with an intrinsic viscosity of 0.75dl / g; it can be obtained commercially;

[0052] Raw material B contains nano-scale SiO 2 Additives for polyethylene terephthalate, SiO 2 The content is 3500ppm, and the intrinsic viscosity is 0.64dl / g; it can be obtained from the market;

[0053] Raw material C is self-made high-viscosity polyethylene terephthalate containing 8% crystallization improver Surly8920;

[0054] Wherein, the mass ratio of the core layer B accounts for 80% of the total mass of the three-layer composite structure;

[0055] S2 Ex...

Embodiment 2

[0059] The preparation process is the same as that of Example 1, except that in the S1 preparation and proportioning process, the selection of raw material components is different;

[0060] S1 material preparation:

[0061] Surface layer A: The raw material composition of the surface layer A includes: 65% raw material A, 30% raw material B, 5% raw material C in terms of mass percentage;

[0062] Core layer B: The raw material composition of the core layer B includes: 95% raw material A, 5% raw material C in terms of mass percentage;

[0063] Wherein, raw material A is the high-viscosity polyethylene terephthalate that intrinsic viscosity is 0.75dl / g;

[0064] Raw material B contains nano-scale SiO 2 Additives for polyethylene terephthalate, SiO 2 The content is 3500ppm, and the intrinsic viscosity is 0.64dl / g;

[0065] Raw material C is self-made high-viscosity polyethylene terephthalate containing 8% crystallization improver Surly8920;

[0066] Among them, the mass of th...

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Abstract

The invention discloses a high-tensile-strength polyester film for a lithium battery current collector. The longitudinal tensile strength of the high-tensile-strength polyester film is greater than 300MPa, and the static longitudinal thermal shrinkage at the temperature of 150 DEG C is less than 1.5%. The high-tensile-strength polyester film is characterized by comprising a surface layer A, wherein the surface layer A is prepared from the following raw materials in percentage by mass: 50-78% of a raw material A, 20-40% of a raw material B and 2-10% of a raw material C; and a core layer B which is prepared from the following raw materials in percentage by mass: 90 to 98 percent of raw material A and 2 to 10 percent of raw material C, wherein the surface layer A is of a two-layer structure and is respectively compounded on two surfaces of the core layer; the raw material A is high-viscosity polyethylene glycol terephthalate, the raw material B is polyethylene glycol terephthalate containing a nanoscale SiO2 additive, and the raw material C is high-viscosity polyethylene glycol terephthalate containing a macromolecular crystallization improver. The inventionis suitable for the technical field of polyester film manufacturing.

Description

technical field [0001] The invention belongs to the technical field of polyester films, in particular to a high-tensile-strength polyester film for lithium battery current collectors and a preparation method thereof. Background technique [0002] The material of the positive electrode current collector of traditional lithium-ion batteries is aluminum foil, with a thickness of 5-25 microns, and the negative electrode current collector is made of copper foil, with a thickness of 5-20 microns; but because aluminum will intercalate lithium at low potential, it is not suitable for negative electrode current collectors. It will be oxidized at high potential, so it is not suitable as a positive electrode collector, but there is an aluminum oxide passivation layer on the aluminum surface, so it can be used as a positive electrode collector. [0003] With the development of lithium battery technology, the high energy density, light weight and flexibility of lithium ion batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/18B32B27/36C08J5/18C08L67/02C08K3/36C08L23/08
CPCC08J5/18B32B27/08B32B27/20B32B27/18B32B27/36C08J2367/02C08K2201/011C08K3/36C08J2423/08Y02E60/10
Inventor 王畅朱亚罗定彬张彪蒋鑫
Owner 浙江南洋科技有限公司
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