Subscribe free to our newsletters via your
  Energy News  




Subscribe free to our newsletters via your




















ENERGY TECH
Researchers optimize the assembly of micro meso and macroporous carbon for Li-S batteries
by Staff Writers
Washington DC (SPX) Feb 10, 2017


Based on the traditional S/C cathode, the effects of surface area, total pore volume and pore size distribution of carbon pores on performances of Li-S batteries are compared. In addition, on the premise of identically high sulfur content, the relation of the micro/meso/macropore volume ratio with the capacity, voltage plateau, rate capability, and cycle stability of Li-S battery are investigated.

Li-S batteries are considered as promising alternatives for Li-ion batteries in the new generation of energy storages, due to high specific capacity (1675 mAh/g) and energy density (2600 mWh/g) of sulfur. But the poor conductivity of sulfur and severe shuttle effect of reaction intermediates destory the stability of this system.

A variety of porous carbon materials have been applied as sulfur host to improve the performances of Li-S batteries for high conductivity, specific surface area and absorption effect. However, what kind of porous carbon would be the optimal choice to accommodate active material? And Which characteristic of carbon pores should be emphasized?

A team of researchers from the School of Materials Science and Engineering and School of Electronic Science and Applied Physics at Hefei University of Technology demostrated that pore size distribution substantially influences the performances of cathode rather than specific surface area and total pore volume.

Furthermore, an optimized assembly of micro/meso/macroporous carbon enables cathode present greatly improved electrochemical performances, in which micropore-volume-ratio to the total pore volume dominates cycling stability of batteries, meso/macropore-volume-ratio influences spaces for sulfur loading and channels to ion transfer.

This research provides a direction of fabricating porous materials for energy storage.The report appears in the latest issue of the journal NANO.

Based on the traditional S/C cathode, the effects of surface area, total pore volume and pore size distribution of carbon pores on performances of Li-S batteries are compared. In addition, on the premise of identically high sulfur content, the relation of the micro/meso/macropore volume ratio with the capacity, voltage plateau, rate capability, and cycle stability of Li-S battery are investigated.

Among the samples, the porous carbon possesses the largest micropore volume ratio of 47.54% while a medium specific surface area of 1217 m2/g and inferior total pore volume of 0.54 cm3/g presents the highest initial discharge specific capacity of 1327 mAh/g and retention of 630 mAh/g over 100 cycles at 0.2C rate along with the best rate capability. The conclusions in this study can be directly applied in material fabrication for other systems of energy storage and even as criterions for further modification of Li-S batteries based on carbon material.

This research was supported by the "Strategic Priority Research Program" of the Chinese Academy of Science (NO. XDA03040000) and the Fundamental Research Funds for the Central Universities (NO. 103-4115100010) of China.


Comment on this article using your Disqus, Facebook, Google or Twitter login.

.


Related Links
World Scientific
Powering The World in the 21st Century at Energy-Daily.com






Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
ENERGY TECH
How to recycle lithium batteries
Washington DC (SPX) Feb 08, 2017
Rechargeable lithium ion batteries power our phones and tablets they drive us from A to B in electric vehicles, and have many applications besides. Unfortunately, the devices that they power can fail and the batteries themselves are commonly only usable for two to three years. As such, there are millions batteries that must be recycled. Research published in the International Journal of En ... read more


ENERGY TECH
Taiwan lantern makers go green for festival of lights

EU parliament backs draft carbon trading reforms

Republican ex-top diplomats propose a carbon tax

Electricity costs: A new way they'll surge in a warming world

ENERGY TECH
Researchers optimize the assembly of micro meso and macroporous carbon for Li-S batteries

Looking for the next leap in rechargeable batteries

UMD physicist improves method for designing fusion experiments

Next-Gen batteries could provide power to microsatellites, cubesats

ENERGY TECH
Michigan meets renewable energy targets

British grid drawing power from new offshore wind farm

Prysmian UK to supply land cable connections for East Anglia ONE offshore wind farm

Russia's nuclear giant pushes into wind energy

ENERGY TECH
Printable solar cells just got a little closer

Governors tell Trump that China will reap low-carbon rewards

First Solar Awarded 140Mw Module Supply Contract For Australia'S Largest Solar Project

Accelerated chlorophyll reaction in microdroplets to reveal secret of photosynthesis

ENERGY TECH
'No risk' in Benin after truck with chemical for nuclear production crashes

Slovenian nuclear plant shuts down after water problem

Slovenian nuclear plant restarts after shutdown

Explosion at French nuclear plant, 'no radiation risk'

ENERGY TECH
Alberta backing bioenergy programs

A better way to farm algae

DuPont Industrial Biosciences to develop new high-efficiency biogas enzyme method

Cathay Pacific to cut emissions with switch to biofuel

ENERGY TECH
Resource-rich Ghana facing mixed economic prospects

Norway sees job prospects improving in oil and gas

Austrian energy group OMV says retooling paid off

Libya asks NATO for security help

ENERGY TECH
Climate study delivers dire warning on Alpine snow

Gas hydrate breakdown unlikely to cause massive greenhouse gas release

Scientists argue current climate change models understate the problem

Researchers say climate models understate risk, ignore human factors




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News








The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement