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Новости химической науки > Новое решение для литий-серных аккумуляторов


4.3.2014
средняя оценка статьи - 2 (4 оценок) Подписаться на RSS

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

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Product Code : 11005

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[ IW356808 IWCIntroduction]

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Product Code : 11005

Brand

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Style

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44mm

Watchband

Stainless steel

Series

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Movement

Automatic mechanical watches

Movement Type

30110

Case

Stainless steel

Dial

Black

Thickness

14mm

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Phenotypic

Round

Surface / Mirror

Double-sided anti-reflective convex sapphire glass

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Beautifully packaged box , manual, warranty card, etc.

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[ IW356808 IWCIntroduction]

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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

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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 >>

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anonymous|Tue, 08 Sep 2015 13:54:05 +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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Featured -   [more]

Replica Omega coaxial escapement Chronometer Co-Axial Chronometer watch series 4151.20.00$25,350.00  $236.00Save: 99% offReplica Matte Brushed Chronometer Omega Chronometer 123.50.31.20.05.002 watch series$15,075.00  $239.00Save: 98% offReplica Smooth Polished Quartz quartz watch Omega 123.55.27.60.55.007 watch series$22,316.00  $200.00Save: 99% off

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

.jqzoom{

float:left;

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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

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Copyright В© 2014 All Rights Reserved.

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

#sddm

{ margin: 0 auto;

padding: 0;

z-index: 30;

background-color:#F4F4F4;

width: 80px;

height:23px;

float: right;

margin-right: 70px;}

#sddm li

{ margin: 0;

padding: 0;

list-style: none;

float: left;

font: bold 12px arial}

#sddm li a

{ display: block;

margin: 0 1px 0 0;

padding: 4px 10px;

width: 60px;

background: #333;

color: #888;

text-align: center;

text-decoration: none}

#sddm li a:hover

{ background: #49A3FF}

#sddm div

{ position: absolute;

visibility: hidden;

margin: 0;

padding: 0;

background: #EAEBD8;

border: 1px solid #5970B2}

#sddm div a

{ position: relative;

display: block;

margin: 0;

padding: 5px 10px;

width: auto;

white-space: nowrap;

text-align: left;

text-decoration: none;

background: #EAEBD8;

color: #2875DE;

font: 12px arial}

#sddm div a:hover

{ background: #49A3FF;

color: #FFF}

Language

Deutsch

FranГ§ais

Italiano

EspaГ±ol

PortuguГЄs

ж—Ґжњ¬иЄћ

Russian

Arabic

Norwegian

Swedish

Danish

Nederlands

Finland

Ireland

English

Payment | 

Shipping & Returns  | 

Wholesale | 

Contact Us

Welcome!

Sign In

or Register

Your cart is empty

omega

New Arrivals

Constellation

Seamaster

Contact Us

Currencies

US Dollar

Euro

GB Pound

Canadian Dollar

Australian Dollar

Jappen Yen

Norske Krone

Swedish Krone

Danish Krone

CNY

Categories

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

Featured -   [more]

Replica Omega coaxial escapement Chronometer Co-Axial Chronometer watch series 4151.20.00$25,350.00  $236.00Save: 99% offReplica Matte Brushed Chronometer Omega Chronometer 123.50.31.20.05.002 watch series$15,075.00  $239.00Save: 98% offReplica Smooth Polished Quartz quartz watch Omega 123.55.27.60.55.007 watch series$22,316.00  $200.00Save: 99% off

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

.jqzoom{

float:left;

position:relative;

padding:0px;

cursor:pointer;

width:301px;

height:450px;

}

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԰·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|Wed, 05 Mar 2014 22:09:56 +0300
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