journal article·2024-09-04

Fluorinated Amide-Based Electrolytes Induce a Sustained Low-Charging Voltage Plateau under Conditions Verifying the Feasibility of Achieving 500 Wh kg–1 Class Li–O2 Batteries

Kiho Nishioka, Mizuki Tanaka, Terumi Goto, Ronja Haas, Anja Henss, Shota Azuma, Morihiro Saito, Shoichi Matsuda, Wei Yu, Hirotomo Nishihara, Hayato Fujimoto, Mamoru Tobisu, Yoshiharu Mukouyama, Shuji Nakanishi

ACS Applied Materials & Interfaces· Volume 16· Issue 35
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Abstract

Although lithium–oxygen batteries (LOBs) hold the promise of high gravimetric energy density, this potential is hindered by high charging voltages. To ensure that the charging voltage remains low, it is crucial to generate discharge products that can be easily decomposed during the successive charging process. In this study, we discovered that the use of amide-based electrolyte solvents containing a fluorinated moiety can notably establish a sustained voltage plateau at low-charging voltages at around 3.5 V. This occurs under conditions that can verify the feasibility of achieving a benchmark energy density value of 500 Wh kg –1 . Notably, the achievement of the low-voltage plateau was accomplished solely by relying on the intrinsic properties of the electrolyte solvent. Indeed, synchrotron X-ray diffraction measurements have shown that the use of fluorine-containing amide-based electrolyte solvents results in the formation of highly decomposable discharge products, such as amorphous and Li-deficient lithium peroxides.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Center for Solar Energy Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

Institute for Physical Chemistry, Justus Liebig University Giessen, Giessen 35392, Germany

Department of Materials and Life Science, Seikei University, Musashino-shi, Tokyo 180-8633, Japan

Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan

Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan

Division of Science, College of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama 350-0394, Japan

Funding

Japan Society for the Promotion of Science · Japan Science and Technology Agency

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