Simply Adding Sulfur Increases Battery Capacity

  • Author: Sarah Millar
  • Published Date: 16 April 2014
  • Source / Publisher: Chemistry – A European Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Simply Adding Sulfur Increases Battery Capacity

Related Societies

Research on lithium–sulfur batteries is increasing as sulfur is capable of delivering an ultrahigh theoretical capacity of 1685 mAh g–1 upon full reduction of sulfur to lithium sulfide (S8+16 Li ↔ 8 Li2S), surpassing all the conventional cathode materials in lithium-ion batteries. However, challenges remain in the insulating nature of sulfur and its dramatic loss in the form of polysulfide during electrochemical charge and discharge processes.

Lianzhou Wang, University of Queensland, Brisbane, Australia, and colleagues report a new type of sandwiched carbon network in which sulfur is loaded onto carbon nanospheres, which are then wrapped in graphene sheets. The graphene sheets restrain the sulfur and protect the formed polysulfide within the well-built carbon network, thereby preventing sulfur loss during electrochemical activities. The sheets also provide intimate contact with sulfur as a highly conducting medium and can buffer the side effects associated with volume expansion of the active sulfur within the battery cell during charge/discharge processes to achieve a durable service life.

When the prepared composite was applied as the lithium–sulfur cathode, the highest specific discharge capacity of 1394 mAh g–1 was obtained at a current rate of 0.1 C, and the cycling stability was well maintained for up to 100 cycles. This composite was also able to deliver specific capacities of 746 and 604 mAh g–1 at 1 C and 2 C, respectively.

Article Views: 3641

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

CONNECT: on Facebook on Twitter on YouTube on LinkedIn Sign up for our free newsletter

Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH