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Showing 1–20 of 20 results
Advanced filters: Author: Stefan A. Freunberger Clear advanced filters
  • Recharging Li–O2 batteries requires oxidation of the discharge product solid Li2O2. Now a redox-mediating molecule is shown to assist this process by transferring electron–holes between solid Li2O2 and the positive electrode in a non-aqueous Li–O2 cell. This allows the cell to be charged at rates that are otherwise impossible.

    • Yuhui Chen
    • Stefan A. Freunberger
    • Peter G. Bruce
    Research
    Nature Chemistry
    Volume: 5, P: 489-494
  • Although rechargeable lithium–air batteries are receiving significant attention because of their high theoretical specific energy, carbon cathodes that are currently used decompose during oxidation and promote electrolyte decomposition on cycling. A titanium carbide-based cathode is now shown to reduce side-reactions, and exhibits enhanced reversible formation and decomposition of Li2O2.

    • Muhammed M. Ottakam Thotiyl
    • Stefan A. Freunberger
    • Peter G. Bruce
    Research
    Nature Materials
    Volume: 12, P: 1050-1056
  • Redox mediators facilitate the oxidation of the highly insulating discharge product in metal–oxygen batteries during recharge and offer opportunities to achieve high reversible capacities. Now a design principle for selecting redox mediators that can recharge the batteries more efficiently is suggested.

    • Stefan A. Freunberger
    News & Views
    Nature Energy
    Volume: 1, P: 1-2
  • Aqueous zinc-ion batteries are attractive due to their low cost, environmental friendliness, and exceptional performance, but the latter remains poorly understood. Now, a fast catalytic step involved in oxygen redox catalysis is shown to contribute to capacity at a high rate.

    • Soumyadip Mondal
    • Stefan A. Freunberger
    News & Views
    Nature Catalysis
    Volume: 7, P: 759-760
  • Understanding lithium sulfide’s electrodeposition and stripping is key to developing practical Li-S batteries. Here, the authors demonstrate that the discharge product in Li-S batteries consists of nano-size solid polysulfide particles and nano-crystalline lithium sulfide.

    • Christian Prehal
    • Jean-Marc von Mentlen
    • Vanessa Wood
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-13
  • Redox mediators catalyse the otherwise slow and energy-inefficient cycling of Li–S and Li–O2 batteries. An investigation of the kinetics of mediated Li2S and Li2O2 oxidations when the redox potentials of various mediators are tuned reveals threshold potentials for high reaction rates, which can be optimized in multiple ways.

    • Deqing Cao
    • Xiaoxiao Shen
    • Yuhui Chen
    Research
    Nature Catalysis
    Volume: 5, P: 193-201
  • Iodide based energy storage is a potential candidate to improve performance of hybrid supercapacitors and batteries. Here, the authors revisit the previous understanding and show that electrochemical oxidation of iodide results in solid iodine deposits stabilized by the confinement of nanoporous carbons.

    • Christian Prehal
    • Harald Fitzek
    • Qamar Abbas
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-10
  • Redox mediators are important for improving the rechargeability of metal–air batteries, however, how they affect singlet oxygen formation and hence parasitic chemistry is unclear, hindering strategies for their improvement. Now, the mechanism of mediated peroxide and superoxide oxidation is elucidated, explaining how redox mediators either enhance or suppress singlet oxygen formation.

    • Yann K. Petit
    • Eléonore Mourad
    • Stefan A. Freunberger
    Research
    Nature Chemistry
    Volume: 13, P: 465-471
  • Redox mediators can enhance redox reactions in Li-O2 batteries; however, their gradual degradation remains unclear. Here the authors show that organic redox mediators are decomposed by singlet oxygen formed during cycling, indicating a strategy for the rational design of stable redox mediators.

    • Won-Jin Kwak
    • Hun Kim
    • Yang-Kook Sun
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8
  • Interphases that form on the anode surface of lithium-ion batteries are critical for performance and lifetime, but are poorly understood. Now, a decade-old misconception regarding a main component of the interphase has been revealed, which could potentially lead to improved devices.

    • Stefan A. Freunberger
    News & Views
    Nature Chemistry
    Volume: 11, P: 761-763
  • Potassium–air batteries, which suffer from oxygen cathode and potassium metal anode degradation, can be cycled thousands of times when an organic anode replaces the metal.

    • Yann K. Petit
    • Stefan A. Freunberger
    News & Views
    Nature Materials
    Volume: 18, P: 301-302
  • Beyond-intercalation batteries promise a step-change in energy storage compared to intercalation-based lithium-ion and sodium-ion batteries. However, only performance metrics that include all cell components and operation parameters can tell whether a true advance over intercalation batteries has been achieved.

    • Stefan A. Freunberger
    Comments & Opinion
    Nature Energy
    Volume: 2, P: 1-4
  • The mechanism of O2 reduction in aprotic solvents is important for the operation of Li–O2 batteries but is not well understood. A single unified mechanism is now described that regards previous models as limiting cases. It shows that the solubility of the intermediate LiO2 is a critical factor that dictates the mechanism, emphasizing the importance of the solvent.

    • Lee Johnson
    • Chunmei Li
    • Peter G. Bruce
    Research
    Nature Chemistry
    Volume: 6, P: 1091-1099
  • The amount of energy that can be stored in Li-ion batteries is insufficient for the long-term needs of society, for example, for use in extended-range electric vehicles. Here, the energy-storage capabilities of Li–O2 and Li–S batteries are compared with that of Li-ion, their performances are reviewed, and the challenges that need to be overcome if such batteries are to succeed are highlighted.

    • Peter G. Bruce
    • Stefan A. Freunberger
    • Jean-Marie Tarascon
    Reviews
    Nature Materials
    Volume: 11, P: 19-29