삼보과학

[기공측정] Battery Separator의 Porosity 측정
작성자 : 삼보과학 작성일 : 2011-04-06 조회수 : 5863
파일첨부 :
아래 논문은 미국 PMI사의 Mr. Stillwell과 Dr. Gupta가 발표한 것으로서 배터리 세퍼레이터 테스트에 적용할 수 있는 Porometry와 Porosimetry 측정방법의 현재의 추세와 새로운 기술혁신에 대해 거론하고 있으며, 더불어 Micro-Flow Porometer를 소개하고 있다. 배터리 세퍼레이터의 기공구조는 배터리와 fuel cell의 효율에 있어서 중요한 특성이다. 그래서 이러한 제품을 제조하거나 개발하는데 있어서 porosity를 측정하는 것은 아주 큰 관심사가 된다. 이 논문에서는 porosity를 측정하는데 가장 널리 사용되는 두 가지 기술인 Porosimetry와 Porometry를 소개하고 있다. 그리고 두 기술의 강점과 한계점에 대해서도 또한 설명한다. 아래에서는 이 논문의 일부분(앞부분)만을 발췌하여 옮겨놓았다. (전체자료가 필요하신 분은 전화나 이메일로 신청하여 주시기 바랍니다.) Current Trends and Innovations in Porometry and Porosimetry Applicable to Battery Separator Testing and Development : Introducing the Micro-Flow Porometer by C. Rebecca Stillwell & Krishna Gupta Porous Materials Inc. USA ABSTRACT Pore structure of separators is a critical property for efficiency of batteries and fuel cells. As such, porosity characterization is of great interest to those developing, as well as those manufacturing, these materials. This paper will discuss the two most frequently used techniques for porosity characterization: porosimetry and porometry. The strengths and limitations of both testing techniques will be discussed with focus on appropriate test selection to obtain optimal results. This paper will also describe the new user-friendly instruments now available from Porous Materials Inc.(PMI) and the recent advances that have made these techniques more useful for those involved with product development, product improvement, and quality control in the battery separator industry. This paper shall introduce the new Micro-Flow Porometer for battery separator testing will be discussed and additional advances in porosimetry shall be introduced. INTRODUCTION Pormetry and porosimetry techniques have undergone tremendous growth and development during the last decade. Part of this growth was stimulated by the recent development of new types of batteries which require the testing of new battery separators with wide-ranging characteristics. Additionally, older, more conventional, battery separators are now being subjected to increasing scrutiny for improved performance and reliability. The need for better porosity testing has thus become imperative in the battery industry. PMI has been developing and manufacturing testing instrumentation for over seventeen years and has developed some of the most advanced instruments for testing porous materials such as battery separators. The critical physical properties of a porous material, such as a battery separator, include the following: 1. Largest Pore Size (Bubble Point) - Determines the largest particle which can pass through the material. 2, Average Pore Diameter - Characterizes average pore size. 3. Pore Size Distribution - Characterizes material uniformity/non-uniformity. 4. Gas Permeability -Determines the rate of gaseous transfer across a material. 5. Liquid Permeability - Determines the rate of liquid transfer across a material. 6. Filter Intergrit - A more accurate check of largest pore size. 7. Total Pore Volume -Checks for diffusional flow through a filter 8. Pore Tortuosity : Characterizes pore structure. All of the physical properties above, except for total pore volume and tortuosity, can be obtained via Capillary Flow Porometry testing provided by the PMI Complete Filter Analyzer. As will be discussed in further detail, the Micro-Flow Porometer increases the accuracy of the gas permeability test for sample material with extremely low permeability. Total pore volume and pore tortuosity (number seven and eight above) can be best determined using porosimetry techniques. The recently developed Aquapore Porosimeter, which will be briefly discussed towards the end of this paper, will gradually replace mercury intrusion as the testing method of choice for separators with sub-micron pore structure. - 이하생략 -

이전글	ViscoSensor가 주는 투자 이익
다음글	[기공측정] Microfiltration membrane의 기공구조 측정

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