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Новости химической науки > Новое решение для литий-серных аккумуляторов4.3.2014 ![]() ![]() Ожидается, что литий-серные источники питания могут запасать в четыре-пять раза больший объем энергии, чем существующие в настоящее время литий-ионные аккумуляторы, однако на пути к их коммерциализации имеется целый ряд помех, которые надо устранить.
Новая работа показывает, что для создания легких и дорогих источников питания, запасающих большое количество энергии, можно использовать серосодержащие полимеры [1].
Низкая практичность литий-серных источников питания связана с их низкой долговечностью. Как отмечает Джеффри Пюн (Jeffrey Pyun) из Университета Аризоны, литий-ионные аккумуляторы могут выдержать до 1000 циклов разрядка/зарядка, а литий-серные с трудом набирают даже сотню таких циклов. Катоды литий-серных аккумуляторов, изготовленные из элементной серы, реагируют с ионами лития, содержащимися в электролите, в результате чего через некоторое время электроды оказываются покрытыми слоем сульфида лития. Помимо затруднения доступа к электродам, это приводит к уменьшению количества серы в катоде, что понижает емкость аккумулятора, а также ведет к необратимым структурным изменениям электродов.
Рисунок из ACS Macro Lett. 2014, DOI: 10.1021/mz400649w
Пюн отмечает, что уже было предпринято несколько попыток увеличить срок службы литий-серных источников питания за счет инкапсуляции серы в наноматериале, что затрудняет ее диссоциацию из катода, однако такой катодный материал все равно нельзя назвать практичным из-за его высокой стоимости. Сам Пюн предположил, что проблему можно решить, используя электроды из серосодержащих полимеров, которые должны отличаться сравнительно невысокой стоимостью для крупномасштабного производства. Сырье для получения таких полимеров также достаточно доступно – ежегодно в ходе переработки нефтяного сырья производится около 60 миллионов тонн элементной серы, большая часть из которой не находит практического применения.
В прошлом году группа Пюна сообщала о способе трансформации элементной серы в недорогой материал для изготовления катода. Нагрев серы до 185°C с последующим добавлением 1,3-диизопропилбензола позволяет получить полимер, содержащий цепочки из атомов серы и остатки диизопропилбензола [2]. Органическая часть этого полимера не запасает энергию и не принимает участие в процессах, протекающих в аккумуляторе, а работает как пластификатор, увеличивающий срок службы катода.
В новом исследовании ученые решили найти наилучший материал для изготовления катода и протестировать его в источниках питания. В плоских круглых аккумуляторах (такие источники питания не только используются для того, чтобы гонять стрелки по циферблату наручных часов, но и для стандартных испытаний электродных материалов) было испытано 2032 сополимеров, различающихся содержанием серы.
Было обнаружено, что наилучшими свойствами обладает полимер, содержащий 90% серы по массе. Источники питания, в которых использовался этот сополимер, отличались емкостью 1225 микроамперчас на грамм аккумулятора, через 100 циклов разрядка/зарядка емкость падала до значения 1005 микроамперчас/г, а через 500 циклов зарядка/разрядка – до 635 микроампер/г. Несмотря на почти двукратное падение емкости литий-серных аккумуляторов, следует отметить, что емкость обычного литий-ионного аккумулятора составляет 200 микроамперчас/г, хотя он и сохраняет такую емкость в течение 1000 циклов зарядка-разрядка.
Несмотря на существенные шаги в направлении создания практически используемого источника питания, новые материалы, хотя и гораздо лучше прежних электродных материалов для литий-серных батарей, все же пока не могут обеспечить коммерциализацию и практическое использование аккумуляторов нового типа. Для применения на практике литий-серные источники питания должны выйти на рубеж устойчивой работы в течение минимум тысячи циклов зарядка/разрядка. Для достижения такой устойчивости Пюн с коллегами продолжает эксперименты с другими серосодержащими полимерами, обладающими свойствами, сходными с уже испытанными.
Источники: [1] ACS Macro Lett. 2014, DOI: 10.1021/mz400649w; [2] Nat. Chem. 2013, DOI: 10.1038/nchem.1624 метки статьи: #новые материалы, #химия полимеров, #химия твердого тела, #электрохимия Перепечатка статьи разрешается при условии размещения активной гиперссылки на ChemPort.Ru Комментарии к статье:
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Description
Product Code : 11005
Brand IWC
Style Male table
Size 44mm
Watchband Stainless steel
Series Aquatimer
Movement Automatic mechanical watches
Movement Type 30110
Case Stainless steel
Dial Black
Thickness 14mm
Function Date Display
Phenotypic Round
Surface / Mirror Double-sided anti-reflective convex sapphire glass
Strap Color Silver
Crown Screw-in crown
Packaging Beautifully packaged box , manual, warranty card, etc.
Waterproof 2000m
[ IW356808 IWCIntroduction] One hundred thirty six years, the local IWC Schaffhausen in Switzerland concentrated study watchmaking . To create a timeless classic works , its design and technology leader in the industry has been the IWC to create brilliant achievements of numerous power . From IWC extraordinary technology and craftsmanship not only Schaffhausen excellent characterization of pure technology , but also reflects the IWC has consistently adhered to its purpose . Assembled in Schaffhausen senior watch , both precise technical performance and excellent design. As an engineer in watch making , IWC factory exemplar case personally as production work, and adhere to the traditional watch making craftsmanship handed down from generation to generation .
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Featured - [more] Series IW504402 IWC Portuguese Automatic mechanical watches men's (IWC)$166,615.00 $239.00Save: 100% offIWC Ingenieur IW376501 Mens Automatic mechanical watches (IWC)$19,575.00 $204.00Save: 99% offIWC Aquatimer IW376701 Men series automatic mechanical watches (IWC)$11,983.00 $184.00Save: 98% off
Home :: IWC aquatimer :: IWC Aquatimer IW356808 Men series automatic mechanical watches (IWC)
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IWC Aquatimer IW356808 Men series automatic mechanical watches (IWC)
$9,116.00 $192.00Save: 98% off
Add to Cart:
Description
Product Code : 11005
Brand IWC
Style Male table
Size 44mm
Watchband Stainless steel
Series Aquatimer
Movement Automatic mechanical watches
Movement Type 30110
Case Stainless steel
Dial Black
Thickness 14mm
Function Date Display
Phenotypic Round
Surface / Mirror Double-sided anti-reflective convex sapphire glass
Strap Color Silver
Crown Screw-in crown
Packaging Beautifully packaged box , manual, warranty card, etc.
Waterproof 2000m
[ IW356808 IWCIntroduction] One hundred thirty six years, the local IWC Schaffhausen in Switzerland concentrated study watchmaking . To create a timeless classic works , its design and technology leader in the industry has been the IWC to create brilliant achievements of numerous power . From IWC extraordinary technology and craftsmanship not only Schaffhausen excellent characterization of pure technology , but also reflects the IWC has consistently adhered to its purpose . Assembled in Schaffhausen senior watch , both precise technical performance and excellent design. As an engineer in watch making , IWC factory exemplar case personally as production work, and adhere to the traditional watch making craftsmanship handed down from generation to generation .
Related Products
IWC Aquatimer IW323103 Men series automatic mechanical watches (IWC)
IWC Aquatimer IW376710 Men series automatic mechanical watches (IWC)
IWC Aquatimer IW353803 series mechanical male watch (IWC)
IWC Aquatimer IW372301 series mechanical male watch (IWC)
Home Shipping Wholesale Order Tracking Coupons Payment Methods Contact Us
IWC ONLINE STORES CHEAP IWC WATCHES REPLICA IWC WATCHES IWC PILOT WATCHES IWC SPITFIRE WATCHES IWC DAVINCI WATCHES
Copyright В© 2012 All Rights Reserved.
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Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
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Basic Information
Code:423.13.37.50.01.001 Brand:Omega Series:Ville Style:Automatic mechanical , 37x37 mm , MenMaterial:Steel
1
PriceProvide accurate prices,
RMB: ВҐ 63,800 2012-03
Euro: € 6,100 2012-07
HK : HK $ 52,400 2008-06
Price is the official media, the public price is for reference only , please go to your local store to discuss the transaction price .
Movement
Movement Type:Cal.3202 Produced Manufacturer:Omega Based movement :Piguet 1285 Calibre:27 mm Movement thickness:6.85 mm Vibration frequency :Oscillation frequency 28800 per hour Number of jewels:37 Power reserve:52 hours
Exterior
Diameter:37x37 mm Case material:Steel Color of the dial :Black Shape of the dial :Square Watches Mirror Material :Sapphire crystal glass Strap Color:Black Strap:Alligator Clasp material:Steel Water depth:50 m
Function
Timing
Brand Profile
Omega OMEGA Began in 1848
World-renowned Omega OMEGA watches was born in Switzerland, with more than 150 years of history . Omega (W) is the twenty- four Greek , is the last letter. It symbolizes the beginning of things and the ultimate , the first and the last . Represents a "perfect , perfection, excellence and achievement," the extraordinary quality of the interpretation of the Omega pursuit of "excellent quality " business philosophy and ... More >> Omega Brands
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Omega Constellation Omega DeVille 4 Chronograph Chronograph watch 4 Counters Chrono Series Calendar Annual Calendar Series Classic Series quartz watches Series Co-Axial Chronoscope Series Co-Axial Rattrapante series Coaxial automatic series Coaxial CHRONOSCOPE Series Coaxial escapement chronometer Co-Axial Chronometer series Coaxial escapement timing Co-Axial Chronograph Series Coaxial small seconds Prestige Small Seconds series Deluxe Pocket Quartz watches Prestige Quartz Small Series Hour Vision Annual Calendar Series Hour Vision Series Ladymatic series Large Calendar X2 Big Date X2 series Luxury automatic watches Prestige Automatic Series Luxury Quartz watches Prestige Quartz series Tourbillon watches Tourbillon series Ville elegant watch series coaxial X2 coaxial Chronograph X2 Co-Axial Chronograph Series Omega Seamaster Omega Special Series Omega speedmaster
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Home :: Omega DeVille :: X2 coaxial Chronograph X2 Co-Axial Chronograph Series :: Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
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Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
$10,633.00 $225.00Save: 98% off
Add to Cart:
Basic Information
Code:423.13.37.50.01.001 Brand:Omega Series:Ville Style:Automatic mechanical , 37x37 mm , MenMaterial:Steel
1
PriceProvide accurate prices,
RMB: ВҐ 63,800 2012-03
Euro: € 6,100 2012-07
HK : HK $ 52,400 2008-06
Price is the official media, the public price is for reference only , please go to your local store to discuss the transaction price .
Movement
Movement Type:Cal.3202 Produced Manufacturer:Omega Based movement :Piguet 1285 Calibre:27 mm Movement thickness:6.85 mm Vibration frequency :Oscillation frequency 28800 per hour Number of jewels:37 Power reserve:52 hours
Exterior
Diameter:37x37 mm Case material:Steel Color of the dial :Black Shape of the dial :Square Watches Mirror Material :Sapphire crystal glass Strap Color:Black Strap:Alligator Clasp material:Steel Water depth:50 m
Function
Timing
Brand Profile
Omega OMEGA Began in 1848
World-renowned Omega OMEGA watches was born in Switzerland, with more than 150 years of history . Omega (W) is the twenty- four Greek , is the last letter. It symbolizes the beginning of things and the ultimate , the first and the last . Represents a "perfect , perfection, excellence and achievement," the extraordinary quality of the interpretation of the Omega pursuit of "excellent quality " business philosophy and ... More >> Omega Brands
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Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
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¹ÚÉú԰·227ºÅ2ºÅÂ¥4Â¥£¬300ƽÃ×£¬2Ôª/©O/Ì죬ÎïÒµ6Ôª£¬Ö»ÓлõÌÝ£¬Ã»ÓеçÌÝ£¬±È½ÏʵÓ㡸ô¶Ï3´ó¼ä£¬5С¼ä£¬²»ÊÇÖн飬 X2 blog Constellation About bestomegawatches.com blog anonymous|Tue, 08 Sep 2015 13:54:04 +0300 ¹ÚÉú԰·227ºÅ2ºÅÂ¥4Â¥£¬300ƽÃ×£¬2Ôª/©O/Ì죬ÎïÒµ6Ôª£¬Ö»ÓлõÌÝ£¬Ã»ÓеçÌÝ£¬±È½ÏʵÓ㡸ô¶Ï3´ó¼ä£¬5С¼ä£¬²»ÊÇÖн飬 Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches - $225.00 : tiffany jewelry, omegawatches2015.com
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Home :: Omega DeVille :: X2 coaxial Chronograph X2 Co-Axial Chronograph Series :: Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
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Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
$10,633.00 $225.00Save: 98% off
Add to Cart:
Basic Information
Code:423.13.37.50.01.001 Brand:Omega Series:Ville Style:Automatic mechanical , 37x37 mm , MenMaterial:Steel
1
PriceProvide accurate prices,
RMB: ВҐ 63,800 2012-03
Euro: € 6,100 2012-07
HK : HK $ 52,400 2008-06
Price is the official media, the public price is for reference only , please go to your local store to discuss the transaction price .
Movement
Movement Type:Cal.3202 Produced Manufacturer:Omega Based movement :Piguet 1285 Calibre:27 mm Movement thickness:6.85 mm Vibration frequency :Oscillation frequency 28800 per hour Number of jewels:37 Power reserve:52 hours
Exterior
Diameter:37x37 mm Case material:Steel Color of the dial :Black Shape of the dial :Square Watches Mirror Material :Sapphire crystal glass Strap Color:Black Strap:Alligator Clasp material:Steel Water depth:50 m
Function
Timing
Brand Profile
Omega OMEGA Began in 1848
World-renowned Omega OMEGA watches was born in Switzerland, with more than 150 years of history . Omega (W) is the twenty- four Greek , is the last letter. It symbolizes the beginning of things and the ultimate , the first and the last . Represents a "perfect , perfection, excellence and achievement," the extraordinary quality of the interpretation of the Omega pursuit of "excellent quality " business philosophy and ... More >> Omega Brands
Related Products
Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.53.37.50.01.001 watches
Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.02.001 watches
Replica Chronograph Omega coaxial X2 X2 Co-Axial Chronograph Series 423.13.37.50.01.001 watches
Home Shipping Wholesale Order Tracking Coupons Payment Methods Contact Us
CONSTELLATION SEAMASTER OMEGA WATCHES OMEGA WATCHES SALE REPLICA OMEGA WATCHES
Copyright В© 2014 All Rights Reserved.
¹ÚÉú԰·227ВєГ…2ºÅÂ¥4Â¥£¬300ƽÃ×£¬2Ôª/В©O/Ì죬ÎïÒµ6Ôª£¬Ö»ÓлõÌÝ£¬Ã»ÓеçÌÝ£¬±È½ÏʵÓ㡸ô¶Ï3´ó¼ä£¬5С¼ä£¬²»ÊÇÖн飬 X2 blog Constellation About bestomegawatches.com blog anonymous|Wed, 05 Mar 2014 22:09:56 +0300 Первые образцы литий-серных батарей были склонны к взрыву при механическом повреждениии. Хотя направление перспективное Вы читаете текст статьи "Новое решение для литий-серных аккумуляторов" Перепечатка статьи разрешается при условии размещения активной гиперссылки на ChemPort.Ru |
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