More and more basic practical application scenarios have been gradually ignored/disregarded, in fundamental research on rechargeable batteries, e.g. assessing cycle life under various depths-of-discharge (DODs). Herein, although benefit from the additional energy density introduced by anionic redox, we critically revealed that lithium-rich layered oxide (LRLO) cathodes present anomalously poor capacity retention at low-DOD cycling, which is essentially different from typical layered cathodes (e.g. NCM), and pose a formidable impediment to the practical application of LRLO. We systemically demonstrated that DOD-dependent capacity decay is induced by the anionic redox and accumulation of oxidized lattice oxygen (O). Upon low-DOD cycling, the accumulation of O and the persistent presence of vacancies in the transition metal (TM) layer intensified the in-plane migration of TM, exacerbating the expansion of vacancy clusters, which further facilitated detrimental out-of-plane TM migration. As a result, the aggravated structural degradation of LRLO at low-DOD impeded reversible Li intercalation, resulting in rapid capacity decay. Furthermore, prolonged accumulation of O persistently corroded the electrode-electrolyte interface, especially negative for pouch-type full-cells with the shuttle effect. Once the "double-edged sword" effect of anionic redox being elucidated under practical condition, corresponding modification strategies/routes would become distinct for accelerating the practical application of LRLO.
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http://dx.doi.org/10.1002/anie.202419909 | DOI Listing |
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December 2024
State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Featured with the highest possible energy density, anode-free lithium-metal batteries (AFBs) are still challenged by the fast capacity decay, especially for the ones operated in commercial carbonate electrolytes, which can be ascribed to the poor stability and continual broken/formation of the solid-electrolyte interface (SEI) formed on the anode side. Here, sacrificial additives, which have low solubility in carbonate electrolytes and can be continuously released, are proposed for AFBs. The sacrificial and continuously-releasing feature gifts the additives the capability to form and heal the SEI during the long-term cycling process, thus minimizing the loss of active Li and enabling the AFLMBs with high loading LiNiCoMnO (21.
View Article and Find Full Text PDFACS Nano
December 2024
School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China.
Polysulfide shuttling and dendrite growth are two primary challenges that significantly limit the practical applications of lithium-sulfur batteries (LSBs). Herein, a three-in-one strategy for a separator based on a localized electrostatic field is demonstrated to simultaneously achieve shuttle inhibition of polysulfides, catalytic activation of the Li-S reaction, and dendrite-free plating of lithium ions. Specifically, an interlayer of polyacrylonitrile nanofiber (PNF) incorporating poled BaTiO (PBTO) particles and coating with a layer of MoS (PBTO@PNF-MoS) is developed on the PP separator.
View Article and Find Full Text PDFAdv Mater
December 2024
Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.
Li-rich Mn-based cathode materials exhibit a remarkable reversible specific capacity exceeding 250 mAh g, positioning them as the preferred choice for the next generation of high-energy density lithium-ion battery cathode materials. However, their inferior rate and cycling performance pose significant challenges. In this context, a Li-rich material incorporating an expanded fast Li-ion diffusion network has been successfully synthesized.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Hefei National Research Center for Physical Sciences at the Microscale, Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, 230026, China.
High nickel layered oxides provide high energy densities as cathodes for next-generation batteries. However, critical issues such as capacity fading and voltage decay, which derive from labile surface reactivity and phase transition, especially under high-rate high-voltage conditions, prevent their commercialization. Here we propose a fluorination strategy to simultaneously introduce F atoms into oxygen layer and create a F aggregated interface.
View Article and Find Full Text PDFAn Acad Bras Cienc
December 2024
Universidade do Estado do Rio de Janeiro, Departamento de Biofísica e Biometria, Núcleo de Genética Molecular Ambiental e Astrobiologia, Rua São Francisco Xavier, 524, Pavilhão Reitor Haroldo Lisboa da Cunha, Subsolo, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil.
Extremophile organisms have been largely studied in Astrobiology. Among them, two antarctic plants emerge as good candidates to become colonizers of other celestial bodies, such as Mars and the Moon. The present research aimed to evaluate survival and growing capacity of Sanionia uncinata and Colobanthus quitensis on Martian (MGS-1) and Lunar (LMS-1) regolith simulants, under terrestrial conditions.
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