Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mapping battery materials with atomic precision

08.03.2018

Berkeley Lab researchers map the atoms of battery materials and explored how composition affects structure

Lithium-ion batteries are widely used in home electronics and are now being used to power electric vehicles and store energy for the power grid. But their limited number of recharge cycles and tendency to degrade in capacity over their lifetime have spurred a great deal of research into improving the technology.


Atomic resolution scanning transmission electron microscopy images and electron diffraction patterns, arranged on a rendering of a battery, show how the structure of lithium-rich and manganese-rich transition metal oxides used inside battery cathodes changes with composition. The images also show how the surface of the cathode has a different structure than the interior.

Credit: Lawrence Berkeley National Laboratory

An international team led by researchers from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) used advanced techniques in electron microscopy to show how the ratio of materials that make up a lithium-ion battery electrode affects its structure at the atomic level, and how the surface is very different from the rest of the material. The work was published in the journal Energy & Environmental Science.

Knowing how the internal and surface structure of a battery material changes over a wide range of chemical compositions will aid future studies on cathode transformations and could also lead to the development of new battery materials.

"This finding could change the way we look at phase transformations within the cathode and the resulting loss of capacity in this class of material," said Alpesh Khushalchand Shukla, a scientist at Berkeley Lab's Molecular Foundry, and lead author of the study. "Our work shows that it is extremely important to completely characterize a new material in its pristine state, as well as after cycling, in order to avoid misinterpretations."

Previous work by researchers at the Molecular Foundry, a research center specializing in nanoscale science, revealed the structure of cathode materials containing "excess" lithium, resolving a longstanding debate.

Using a suite of electron microscopes both at the National Center for Electron Microscopy (NCEM), a Molecular Foundry facility, and at SuperSTEM, the National Research Facility for Advanced Electron Microscopy in Daresbury, U.K., the research team found that while the atoms throughout the interior of the cathode material remained in the same structural pattern across all compositions, decreasing the amount of lithium caused an increase in randomness in the position of certain atoms within the structure.

By comparing different compositions of cathode material to battery performance, the researchers also demonstrated it was possible to optimize battery performance in relation to capacity by using a lower ratio of lithium to other metals.

The most surprising finding was that the surface structure of an unused cathode is very different from the interior of the cathode. A thin layer of material on the surface possessing a different structure, called the "spinel" phase, was found in all of their experiments. Several previous studies had overlooked that this layer might be present on both new and used cathodes.

By systematically varying the ratio of lithium to a transition metal, like trying different amounts of ingredients in a new cookie recipe, the research team was able to study the relationship between the surface and interior structure and to measure the electrochemical performance of the material. The team took images of each batch of the cathode materials from multiple angles and created complete, 3-D renderings of each structure.

"Obtaining such precise, atomic-level information over length scales relevant to battery technologies was a challenge," said Quentin Ramasse, Director of the SuperSTEM Laboratory. "This is a perfect example of why the multiple imaging and spectroscopy techniques available in electron microscopy make it such an indispensable and versatile tool in renewable energy research."

The researchers also used a newly developed technique called 4-D scanning transmission electron microscopy (4-D STEM). In transmission electron microscopy (TEM), images are formed after electrons pass through a thin sample. In conventional scanning transmission electrode microscopy (STEM), the electron beam is focused down to a very small spot (as small as 0.5 nanometers, or billionths of a meter, in diameter) and then that spot is scanned back and forth over the sample like a mower on a lawn.

The detector in conventional STEM simply counts how many electrons are scattered (or not scattered) in each pixel. However, in 4D-STEM, the researchers use a high-speed electron detector to record where each electron scatters, from each scanned point. It allows researchers to measure the local structure of their sample at high resolution over a large field of view.

"The introduction of high-speed electron cameras allows us to extract atomic-scale information from very large sample dimensions," said Colin Ophus, a research scientist at NCEM. "4D-STEM experiments mean we no longer need to make a tradeoff between the smallest features we can resolve and the field-of-view that we are observing - we can analyze the atomic structure of the entire particle at once."

###

Berkeley Lab's Molecular Foundry is a DOE Office of Science User.

This work was supported by the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy, Office of Basic Science, and Small Business Voucher Pilot Program; Envia Systems; and the U.K.'s Engineering and Physical Science Research Council.

Lawrence Berkeley National Laboratory addresses the world's most urgent scientific challenges by advancing sustainable energy, protecting human health, creating new materials, and revealing the origin and fate of the universe. Founded in 1931, Berkeley Lab's scientific expertise has been recognized with 13 Nobel Prizes. The University of California manages Berkeley Lab for the U.S. Department of Energy's Office of Science. For more, visit http://www.lbl.gov.

DOE's Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.

Media Contact

Glenn Roberts Jr.
geroberts@lbl.gov
510-486-5582

 @BerkeleyLab

http://www.lbl.gov 

Glenn Roberts Jr. | EurekAlert!

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

Im Focus: Basel researchers succeed in cultivating cartilage from stem cells

Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.

Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...

Im Focus: Like a wedge in a hinge

Researchers lay groundwork to tailor drugs for new targets in cancer therapy

In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...

Im Focus: The Future of Ultrafast Solid-State Physics

In an article that appears in the journal “Review of Modern Physics”, researchers at the Laboratory for Attosecond Physics (LAP) assess the current state of the field of ultrafast physics and consider its implications for future technologies.

Physicists can now control light in both time and space with hitherto unimagined precision. This is particularly true for the ability to generate ultrashort...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

One step closer to reality

20.04.2018 | Life Sciences

The dark side of cichlid fish: from cannibal to caregiver

20.04.2018 | Life Sciences

Diamond-like carbon is formed differently to what was believed -- machine learning enables development of new model

19.04.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>