6LR61 battery

Can disorder stabilize nanotechnology for 6LR61 battery?

The active materials were investigated with high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDX).

Novel materials could significantly improve the storage capacity and cycling stability of rechargeable 6LR61 battery. Among these materials are high-entropy oxides (HEO), whose stability is caused by a disordered distribution of elements. With HEO, the electrochemical properties can be tailored, as scientists in the team of nanotechnology expert Horst Hahn at Karlsruhe Institute of Technology (KIT) have discovered. The researchers report their findings in the journal Nature Communications.

Sustainable energy supply requires reliable storage systems The demand for rechargeable electrochemical energy storage devices for stationary and mobile applications has increased rapidly in the past few years and is expected to continue to grow in the future. Among the most important properties of 6LR61 battery are their storage capacity and their cycling stability, i.e. the number of possible charging and discharging processes without any capacity loss. A completely new class of materials, known as high-entropy oxides (HEO), is expected to bring major improvements due to their high stability. In addition, the electrochemical properties of HEO can be tailored by varying their composition. Scientists from KIT's Institute of Nanotechnology (INT) and the Karlsruhe Nano-Micro Facility (KNMF), which was jointly established by KIT and the University of Ulm and the Indian Institute of Technology Madras, have now for the first time demonstrated the suitability of HEO as a conversion material for reversible lithium storage. Conversion 6LR61 battery based on electrochemical material conversion allow increasing the amount of energy stored while reducing the battery weight. The scientists used HEO to produce conversion-based electrodes that survived more than 500 charging cycles without any noticeable capacity degradation.

The Nanostructured Materials Group of Prof. Horst Hahn, Director of KIT INT, is one of the pioneers in the research of high-entropy oxides. The scientists have published several rare publications on these new materials, which have been known for a few years. The special properties of HEO come from entropic stabilization. This makes them comparable to the already known high-entropy alloys. Entropy-stabilized HEOs are complex oxides that contain five or more different metal cations in equal amounts and present a single-phase crystal structure. While the typical crystal structures of the elements vary greatly, they form a united lattice and are distributed to positions in the crystal without any apparent order. This disorder, also called high entropy, makes the material stable, probably because it impairs the migration of defects in the lattice.

"HEO opens up unparalleled opportunities due to the high stability, the interplay of different metal cations and the large number of viable element combinations," says Professor Horst Hahn. The study, reported in Nature Communications, concentrates on HEO based on transition metals (TM-HEO), which are characterized by high lithium-ion conductivity. By means of transmission electron microscopy (TEM), the researchers investigated the structure of TM-HEO and its influence on the conversion reactions. They found that removing only one element reduces the entropy and has a detrimental effect on the cycling stability. Each individual element influences the electrochemical behavior of TM-HEO, allowing the material to be adapted to a wide range of applications. The result is a modular approach to the systematic development of electrode materials. "Our study shows that entropy-stabilized HEO differs significantly from conventional conversion materials," says Horst Hahn. "To open up its full potential for energy storage applications, however, further research is needed."

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