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Membrane, battery separator, battery, and device having membrane

A battery separator, battery technology, applied in secondary battery charging/discharging, batteries, separators/films/diaphragms/spacers, etc., to achieve the effect of improving strength, high porosity, and excellent charging rate performance

Pending Publication Date: 2022-07-05
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, particle stretched membranes may have pores that look more like ovals

Method used

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  • Membrane, battery separator, battery, and device having membrane
  • Membrane, battery separator, battery, and device having membrane
  • Membrane, battery separator, battery, and device having membrane

Examples

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Embodiment 1

[0039] Polypropylene (PP) resin was extruded using a 2.5 inch extruder. The extruder melt temperature was about 221°C. The polymer melt was fed to a circular die. The die temperature was set to about 220°C, and the polymer melt was cooled by blowing air. The thickness of the extruded precursor was about 1-1.5 mils, in some cases 1.2-1.4 mils, and in some cases about 27 μm. Then, the extruded film was annealed at about 150°C for about 2 minutes. The annealed film was then cold stretched to about 20% at room temperature, then hot stretched to about 228% and relaxed to about 32% in a temperature range of 150-160°C. The MD stretched film was then stretched 450% in the transverse direction (TD) at a TD stretching temperature in the range of about 140-152°C with a 50% MD relaxation. The finished film had a thickness of 15 microns and a porosity of 74%. The TD tensile strength of the finished film is 529Kg / cm 2 .

Embodiment 2

[0041]Polypropylene (PP) resin was extruded using a 2.5 inch extruder. The extruder melt temperature was about 221°C. The polymer melt was fed to a circular die. The die temperature was set to about 220°C, and the polymer melt was cooled by blowing air. The thickness of the extruded precursor was about 1-1.5 mils, in some cases 1.2-1.4 mils, and in some cases about 27 μm. The extruded film was then annealed at about 150°C for about 2 minutes. The annealed film was then cold stretched to about 20% at room temperature, then hot stretched to about 228% and relaxed to about 32% in a temperature range of 160-170°C. The MD stretched film was then stretched 450% in the transverse direction (TD) at a TD stretching temperature in the range of about 150-160°C with a 50% MD relaxation. The finished film had a thickness of 20 microns and a porosity of 69%. The TD tensile strength of the finished film is 650Kg / cm 2 .

[0042] The characteristics of the films formed according to Exam...

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Abstract

A membrane for a battery separator comprising: a dry-stretched microporous polypropylene film having a pore aspect ratio (MD / TD) of 1.0, a three-dimensional pore sphericity coefficient (MD / TD / ND) of 1.0 to 2.0, an average pore size of 0.09 to 0.99 [mu] m; the ratio of the tensile strength in the machine direction to the tensile strength in the transverse direction is 1.4-1.6; the transverse (TD) tensile strength is 500 to 700 Kg / cm < 2 >; the TD shrinkage rate after 1 hour at 90 DEG C is 0.1% or 0.2%; and, when the membrane is used in a rechargeable lithium battery, the rechargeable lithium battery has a charge capacity of at least 108.64 mAh / g under charge and / or discharge performance conditions of 10C. The membranes according to the present invention have improved strength, high porosity, excellent charge rate and / or charge capacity performance for use in high power and / or high energy applications, batteries, devices, systems and / or vehicles, and the like.

Description

[0001] This application is a divisional application, the original priority date is January 29, 2016; the original international filing date is January 27, 2017; the original international application number is PCT / US2017 / 015230; the date of entering the Chinese national phase is 2018 On September 5, 2017, the Chinese application number was 201780015469.4; the original name of the invention was "Improved Separator, Battery, System, Vehicle and Related Methods". [0002] CROSS-REFERENCE TO RELATED APPLICATIONS [0003] This application claims priority to and the benefit of US Provisional Patent Application Serial No. 15 / 009,888, filed January 29, 2016, which is hereby incorporated by reference in its entirety. technical field [0004] According to at least selected embodiments, the present invention or application relates to new or improved battery separators, base films or membranes, batteries, battery cells, devices, systems and / or vehicles, and / or the manufacture and / or use ...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M50/403H01M50/414H01M50/417H01M50/423H01M50/457B29C48/08B29C48/10H01M50/406H01M50/426H01M50/491H01M50/494
CPCH01M50/40H01M50/403H01M50/414H01M50/417H01M50/423H01M50/457B29C55/005B29C48/0018B29C48/21B29C48/92B29C48/08B29C48/10B29C48/32B29C48/917B29C2948/92704B29C55/14B29C55/16B29D99/005B29K2023/12B29L2031/3468B29L2031/755H01M10/0525Y02E60/10H01M50/406H01M50/491H01M50/426H01M50/494B29K2995/0077B29K2105/041B29K2995/004B32B27/08H01M10/42H01M2010/4292B29C48/18H01M50/463H01M50/449H01M50/411B29C65/00H01M2220/20H01M2220/30
Inventor 张晓民杰拉尔德·P·拉米雷斯卡尔·F·休米斯顿查尔斯·E·海瑞蒂隆·S·菲尔茨迈克尔·A·布拉斯维尔罗纳德·A·普罗克特罗尼·E·史密斯
Owner CELGARD LLC