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Superoxide gives lithium-air batteries a jolt

Date:
January 13, 2016
Source:
DOE/Argonne National Laboratory
Summary:
In a recent experiment, scientists were able to produce stable crystallized lithium superoxide instead of lithium peroxide during battery discharging. Unlike lithium peroxide, lithium superoxide can easily dissociate into lithium and oxygen, leading to high efficiency and good cycle life.
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While lithium-ion batteries have transformed our everyday lives, researchers are currently trying to find new chemistries that could offer even better energy possibilities. One of these chemistries, lithium-air, could promise greater energy density but has certain drawbacks as well.

Now, thanks to research at the U.S. Department of Energy's (DOE) Argonne National Laboratory, one of those drawbacks may have been overcome.

All previous work on lithium-air batteries showed the same phenomenon: the formation of lithium peroxide (Li2O2), a solid precipitate that clogged the pores of the electrode.

In a recent experiment, however, Argonne battery scientists Jun Lu, Larry Curtiss and Khalil Amine, along with American and Korean collaborators, were able to produce stable crystallized lithium superoxide ((LiO2) instead of lithium peroxide during battery discharging. Unlike lithium peroxide, lithium superoxide can easily dissociate into lithium and oxygen, leading to high efficiency and good cycle life.

"This discovery really opens a pathway for the potential development of a new kind of battery," Curtiss said. "Although a lot more research is needed, the cycle life of the battery is what we were looking for."

The major advantage of a battery based on lithium superoxide, Curtiss and Amine explained, is that it allows, at least in theory, for the creation of a lithium-air battery that consists of what chemists call a "closed system." Open systems require the consistent intake of extra oxygen from the environment, while closed systems do not -- making them safer and more efficient.

"The stabilization of the superoxide phase could lead to developing a new closed battery system based on lithium superoxide, which has the potential of offering truly five times the energy density of lithium ion," Amine said.

Curtiss and Lu attributed the growth of the lithium superoxide to the spacing of iridium atoms in the electrode used in the experiment. "It looks like iridium will serve as a good template for the growth of superoxide," Curtiss said.

"However, this is just an intermediate step," Lu added. "We have to learn how to design catalysts to understand exactly what's involved in lithium-air batteries."

The researchers confirmed the lack of lithium peroxide by using X-ray diffraction provided by the Advanced Photon Source, a DOE Office of Science User Facility located at Argonne. They also received allocations of time on the Mira supercomputer at the Argonne Leadership Computing Facility, which is also a DOE Office of Science User Facility. The researchers also performed some of the work at Argonne's Center for Nanoscale Materials, which is also a DOE Office of Science User Facility.

A study based on the research appeared in the January 11 issue of Nature.

The work was funded by the DOE's Office of Energy Efficiency and Renewable Energy and Office of Science.


Story Source:

Materials provided by DOE/Argonne National Laboratory. Original written by Justin H.S. Breaux. Note: Content may be edited for style and length.


Journal Reference:

  1. Jun Lu, Yun Jung Lee, Xiangyi Luo, Kah Chun Lau, Mohammad Asadi, Hsien-Hau Wang, Scott Brombosz, Jianguo Wen, Dengyun Zhai, Zonghai Chen, Dean J. Miller, Yo Sub Jeong, Jin-Bum Park, Zhigang Zak Fang, Bijandra Kumar, Amin Salehi-Khojin, Yang-Kook Sun, Larry A. Curtiss, Khalil Amine. A lithium–oxygen battery based on lithium superoxide. Nature, 2016; DOI: 10.1038/nature16484

Cite This Page:

DOE/Argonne National Laboratory. "Superoxide gives lithium-air batteries a jolt." ScienceDaily. ScienceDaily, 13 January 2016. <www.sciencedaily.com/releases/2016/01/160113161535.htm>.
DOE/Argonne National Laboratory. (2016, January 13). Superoxide gives lithium-air batteries a jolt. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2016/01/160113161535.htm
DOE/Argonne National Laboratory. "Superoxide gives lithium-air batteries a jolt." ScienceDaily. www.sciencedaily.com/releases/2016/01/160113161535.htm (accessed March 28, 2024).

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