26494

اثر استفاده از نانوذره سيليكا و ترموپلاستيك الاستومر الفيني بر خواص جداكننده هاي پلي اتيلني در باتري هاي ليتيمي

كارشناسي ارشد

مهندسي پليمر

1398

1400/12/11

دكتر محمد فصيحي دستجردي

مهندسي شيمي نفت و گاز

ﺑﺎﺗﺮىﻫﺎى ﻟﻴﺘﻴﻮم ﻳﻮن از مهم ترين و ﭘﺮﻃﺮﻓﺪارﺗﺮﻳﻦ ﺑﺎﺗﺮىﻫﺎى ﻣﻮﺟﻮد در ﺑﺎزار ﻫﺴﺘﻨﺪ و ﺑﻪ دﻟﻴﻞ ﻗﺎﺑﻠﻴﺖ ﺷﺎرژ دوﺑﺎره، ﺳﺮﻋﺖ ﺷﺎرژ، ﭼﮕﺎﻟﻲ اﻧﺮژى ﺑﺎﻻ، ﺧﻮدﺗﺨﻠﻴﻪ ﺷﺎرژ ﭘﺎﻳﻴﻦ، وزن ﻛﻢ و ﻃﻮل ﻋﻤﺮﻧﺴﺒﺘﺎً ﻃﻮﻻﻧﻲ روز ﺑﻪ روز ﺑﺮ ﻣﺤﺒﻮﺑﻴﺖ آﻧﻬﺎ اﻓﺰوده ﻣﻲﺷﻮد. در باتري ﺟﺪاﻛﻨﻨﺪه ﺑﻪ ﻃﻮر ﻣﻌﻤﻮل ﻳﻚ ﻏﺸﺎى ﻣﺘﺨﻠﺨﻞ اﺳﺖ ﻛﻪ ﺑﻪ دو روش ﺧﺸﻚ و ﺗﺮ ﺳﺎﺧﺘﻪ ﻣﻲﺷﻮد و اﺟﺎزه ﻣﻲدﻫﺪ ﺟﺮﻳﺎن ﻳﻮﻧﻲ ﺑﻴﻦ دو اﻟﻜﺘﺮود (آﻧﺪ و ﻛﺎﺗﺪ) ﺟﺮﻳﺎن ﻳﺎﺑﺪ، در ﺣﺎﻟﻲ ﻛﻪ از ﺗﻤﺎس ﻓﻴﺰﻳﻜﻲ ﺑﻴﻦ آﻧﻬﺎ ﺟﻠﻮﮔﻴﺮى ﻣﻲﻛﻨﺪ. در ﺟﺪاﻛﻨﻨﺪهﻫﺎ داﺷﺘﻦ ﻣﺸﺨﺼﺎﺗﻲ ﻣﺎﻧﻨﺪ: ﻧﻔﻮذﭘﺬﻳﺮى، ﺗﺨﻠﺨﻞ، اﻧﺪازه ﻣﻨﺎﻓﺬ، ﺟﺬب اﻟﻜﺘﺮوﻟﻴﺖ و ﺣﻔﻆ آن، ﭘﺎﻳﺪارى ﺷﻴﻤﻴﺎﻳﻲ ﺣﺮارﺗﻲ و ﻣﻜﺎﻧﻴﻜﻲ ﺑﺴﻴﺎر ﻣﻬﻢ ﻣﻲﺑﺎﺷﺪ. در اين پژوهش ﺑﺎ اﺳﺘﻔﺎده از روش ﺗﺮ و ﺑﺎ اﻓﺰودن 50% روﻏﻦ( دى اﻛﺘﻴﻞ ﻓﺘﺎﻻت) ﺑﻪ ﻣﺨﻠﻮط ﭘﻠﻲاﺗﻴﻠﻦ و ﺳﻴﻠﻴﻜﺎ، و اﺳﺘﺨﺮاج آﻧﻬﺎ ﺗﻮﺳﻂ ﺣﻼل اﺗﺎﻧﻮل ﺑﻪ ﺗﺨﻠﺨﻞ ﺗﻘﺮﻳﺒﻲ 35% رسيده شد. از ﻃﺮﻓﻲ ﺑﺎﺗﻮﺟﻪ ﺑﻪ اﻳﻨﻜﻪ روﻏﻦ اﺳﺘﺤﻜﺎم ﻛﺸﺸﻲ را ﻛﺎﻫﺶ ﻣﻲدﻫﺪ و ﻣﺎﻧﻊ از ﻛﺎﻫﺶ ﻣﻨﺎﺳﺐ ﺿﺨﺎﻣﺖ ﻓﻴﻠﻢ، در ﻓﺮآﻳﻨﺪ ﻛﺸﺶ ﻣﻲﺷﻮد از ترموپلاستيك الاستومر ﺑﻪ ﺟﺎى روﻏﻦ اﺳﺘﻔﺎده گرديد و ﻣﺸﺎﻫﺪه ﺷﺪ ﻛﻪ در ﻓﺮآﻳﻨﺪ ﻛﺸﺶ ﺑﻪ فيلمي ﺑﺎ ﺿﺨﺎﻣﺖ ﺗﻘﺮﻳﺒﻲ 50 ﻣﻴﻜﺮون و درﺻﺪ ﺗﺨﻠﺨﻞ ﺑﻴﺸﺘﺮى، در ﺣﺪود 50% مي توان دست يافت. جداكننده هاي پلي الفيني با وجود ويژگي هاي مثبتي كه دارند اما ﺑﻪ دﻟﻴﻞ داﺷﺘﻦ ﺳﻄﺢ آﺑﮕﺮﻳﺰ، ﺗﺮﺷﻮﻧﺪﮔﻲ ﺟﺪاﻛﻨﻨﺪه ﺑﺎ اﻟﻜﺘﺮوﻟﻴﺖ ﻛﻢ ﻣﻲﺑﺎﺷﺪ ﻛﻪ ﻣﻨﺠﺮﺑﻪ ﺟﺬب اﻟﻜﺘﺮوﻟﻴﺖ ﻛﻤﺘﺮ و درﻧﺘﻴﺠﻪ ﻛﺎﻫﺶ رﺳﺎﻧﺎﻳﻲ ﻳﻮﻧﻲ ﻣﻲﮔﺮدد ﻟﺬا ﺑﺮاى رﻓﻊ اﻳﻦ ﻣﺸﻜﻞ، از اﺻﻼﺣﺎﺗﻲ ﻣﺎﻧﻨﺪ: ﭘﻮﺷﺶدﻫﻲ ﺳﻄﺤﻲ، ﭘﻴﻮﻧﺪزﻧﻲ، ﺗﺎﺑﺶ و ﻣﺨﻠﻮطﻛﺮدن اﺳﺘﻔﺎده ﻣﻲﺷﻮد. در اﻳﻦ پژوهش با استفاده از روش مخلوط كردن، با افزودن ﻧﺎﻧﻮذره ﺳﻴﻠﻴﻜﺎ ﺑﻪ ﺟﺪاﻛﻨﻨﺪهﻫﺎى ﭘﻠﻲاﺗﻴﻠﻨﻲ، مشاهده شده ﻛﻪ در ﻣﻘﺎﻳﺴﻪ ﺑﺎ ﺟﺪاﻛﻨﻨﺪهﻫﺎى ﭘﻠﻲاﺗﻴﻠﻨﻲ ﻣﻌﻤﻮﻟﻲ، ﻗﺎﺑﻠﻴﺖ ﺟﺬب اﻟﻜﺘﺮوﻟﻴﺖ ﺑﺎﻻرﻓﺘﻪ و ﻫﻢﭼﻨﻴﻦ ﭘﺎﻳﺪارى ﺣﺮارﺗﻲ ﺑﻴﺸﺘﺮى ﻣﺸﺎﻫﺪه ﺷﺪ. هم چنين مقدار رسانش يوني نمونه ها مقايسه شد و مشاهده گرديد كه استفاده از نانوذره و TPEباعث افزايش رسانش يوني شده است.

1401/03/01

Effect of silica nanoparticles and thermoplastic elastomer olefin on the properties of polyethylene separators in lithium batteries

3/2/2023 12:00:00 AM

Lithium ion batteries are one of the most important and popular batteries on the market and due to their rechargeability, Charging speed, high energy density, low charge self-discharge, low weight and relatively long service life on a daily basis They are added. In a separator battery, it is usually a porous membrane that is dry and wet in two ways It is made and allows ionic current to flow between the two electrodes of the anode and the cathode (while flowing from physical contact Prevents between them. In separators having characteristics such as: permeability, porosity, pore size, adsorption Electrolyte and its preservation, thermal and mechanical chemical stability is very important. In this research using the method By adding 50% dioctyl phthalate oil (to a mixture of polyethylene and silica, and extracting them with ethanol solvent) Approximately 35% porosity was reached. On the other hand, due to the fact that the oil reduces the tensile strength and prevents Proper reduction of film deterioration, in the stretching process, thermoplastic elastomer was used instead of oil and It was observed that in the process of stretching to a film with an approximate thickness of 50 microns and a higher porosity, about 50% can be achieved. Polyolefin separators, despite their positive properties, but because of their surface Hydrophobic is a separator with low electrolyte, which leads to less electrolyte adsorption and thus less conductivity. To solve this problem, modifications such as: surface coating, bonding, irradiation and mixing are ionized. Is used. In this study, using the mixing method, by adding silica nanoparticles to separators. It has been observed that compared to conventional polyethylene separators, the electrolyte adsorption capacity is increased and More thermal stability was also observed. Also, the amount of ionic conductivity of the samples was compared and observed The use of nanoparticles and TPE has increased ionic conductivity.

باتري ليتيمي , جداكننده , پلي اتيلن , ترموپلاستيك الاستومر , روغن دي اكتيل فتالات

lithium battery , separator , polyethylene , thermoplastic elastomer , dioctyl phthalate oil

Ali Darvishi

Dr. Mohammad Fasihi Dastjerdi