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Ni‐rich layered oxide cathode materials demonstrate high energy densities for Li‐ion batteries, but the electrochemically driven thermal runaway and mechanical degradation remain their long‐standing challenges in practical applications. Herein, it presents a novel ZrV2O7 (ZVO) coating with negative thermal expansion properties along the secondary particles and primary particle grain boundaries (GBs),...
The main challenge for aqueous asymmetric supercapacitors (ASCs) is the relatively low voltage, which significantly diminishes the energy density of the device. Here, cation-intercalated manganese oxide nanosheets Na0.55Mn2O4·1.5H2O (NaMnO) are synthesized via a facile molten salts method. We find that the electrode potential window for NaMnO nanosheets can be extended to 1.2 V using a low-cost and...
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