• 2 minutes Oil Price Could Fall To $30 If Global Deal Not Extended
  • 5 minutes The Inconvenient Truth Of Electric Cars
  • 8 minutes Iran downs US drone. No military response . . Just Destroy their economy. Can Senator Kerry be tried for aiding enemy ?
  • 45 mins Here we go folks, the wish of so many: Pres. Trump threatens to lessen US security role in Strait of Hormuz, unveils sanctions
  • 3 hours Climate change & Wildfires: More Wildfires To The Western U.S., Will Affect Tens Of Millions Of People
  • 42 mins The Plastics Problem
  • 6 hours Hard To Believe: UAE Will Work To Defuse Middle East Tension
  • 8 hours Oil Demand Needs to Halve: Equinor
  • 11 mins Wonders of Shale - Gas, bringing investments and jobs to the US
  • 2 hours Looks like Trump is putting together a "Real" Coalition to protect Persian shipping lanes. Makes perfect sense. NO Fake "Coalition's of the Willing" UPDATE REUTERS Pompeo "Sentinel Program"
  • 4 hours Cherry Picking Climate Data
  • 11 mins Magic of Shale: EXPORTS!! Crude Exporters Navigate Gulf Coast Terminal Constraints
  • 17 hours Here We Go: New York Lawmakers Pass Aggressive Law To Fight Climate Change
  • 14 hours Solar Panels at 26 cents per watt
  • 8 hours Green vs. Coal: Bavaria Seeks Fast-Track German Coal Exit in Snub to Merkel Plan
  • 2 hours Coal Boom in Asia is Real and a Long Trend
Alt Text

A Worrying Sign For Global Oil Demand

It looks like we are…

Alt Text

The Irony of California’s Oil Dependence

California’s oil production has been…

Alt Text

Middle East Tensions Move Oil Prices Higher

Oil inched higher on Tuesday…

Futurity

Futurity

Futurity covers research news from the top universities in the US, UK, Canada and Australia

More Info

Premium Content

How Food Can Build Better Lithium Batteries

A component of corn starch and the yolk-shell structure of eggs can improve the durability and performance of lithium-sulfur battery cathodes, report researchers.

Lithium-sulfur batteries are a promising alternative to today’s lithium-ion batteries.

“There is currently a great need for high-energy, long-life, and low-cost energy storage materials, and lithium sulfur batteries are one of the most promising candidates,” says Weidong Zhou, a former postdoctoral researcher in Professor Hector Abruña’s lab at Cornell University and first author of two papers, which are published in ACS Nano and the Journal of the American Chemical Society.

 “From electric vehicles to solar and wind power, applications for better lithium-based battery technologies are countless.”

UNSTABLE BATTERIES

“Lithium-sulfur batteries could potentially offer about five times the energy density of today’s typically used lithium-ion batteries,” says Yingchao Yu, a PhD student with Abruña and co-first author on the JACS publication. “But a lithium-sulfur battery is not a stable system, as its capacity tends to fade over a short period of time.”

Related Article: Japan Looks at Recycling Vehicle Batteries for Renewable Power

After about 50 charge cycles, the energy density of a lithium-sulfur battery decreases rapidly due to a phenomenon called the polysulfide shuttling effect, which is when the polysulfide chains in the battery’s cathode (positive end) dissolve in the electrolyte, the ionizing liquid that allows electrons to flow.

To combat this problem and stabilize the sulfur, the researchers used amylopectin, a polysaccharide that’s a main component of corn starch.

“The corn starch can effectively wrap the graphene oxide-sulfide composite through the hydrogen bonding to confine the polysulfide among the carbon layers,” says Hao Chen, co-first author of the ACS Nano publication and a former PhD student in the lab of Francis DiSalvo, paper co-author and professor of chemistry and chemical biology. “As an additive, it greatly improves the cycling stability of the battery.”

EGG DESIGN

In another approach to improving lithium-sulfur battery durability, the researchers also report a new way to make lithium-sulfur cathodes by synthesizing a nanocomposite, consisting of sulfur coated with a common, inexpensive, conductive polymer called polyaniline, and modelled after the way an egg is encased in a shell but has room to move around inside.

Similar sulfur-polyaniline composites have previously been synthesized in a “core-shell” structure, but the new method provides an internal void within the polymer shell, called a “yolk-shell” structure.

“When the lithium-sulfur battery was fully discharged, the volume of the sulfur expanded dramatically to 200 percent. If you think about the beauty of an egg yolk, there is some empty space inside, with space for the yolk to expand,” Yu says.

Related Article: Why I Love Tesla, but Dislike TSLA

The polyaniline coating, which chemically is a benzene ring with ammonium and strung into cross-linked chains, is also soft and flexible, and can protect against the “shell” cracking during long cycling.

Provisional patents for these innovations have been filed through the Cornell Center for Technology, Commercialization and Enterprise. A Cornell startup company called Lionano Inc. is now commercializing these technologies for the marketplace.

The Department of Energy and the Energy Materials Center at Cornell, an Energy Frontier Research Center funded by the US DOE, funded the papers. The researchers used the electron microscopy facility of the Cornell Center for Materials Research with support from the National Science Foundation Materials Research Science and Engineering Centers program.

By  Anne Ju-Cornell




Download The Free Oilprice App Today

Back to homepage


Leave a comment

Leave a comment




Oilprice - The No. 1 Source for Oil & Energy News