Researchers at ORNL, a division of the U.S. Department of Energy, have devised a new all-solid-state lithium-sulfur battery with about 4 times the energy density of the lithium-ion batteries currently in widespread use in electronic devices at more cost low. Relevant research published in this week's edition of the world's top chemical journal "German Applied Chemistry International Edition". Leung Shing-tuk, the leader of the study, said: "The electrolyte used in the new battery is also a solid. This design idea completely subverts the inherent voltage of two electrodes plus a stack of electrolytes that have been extended from 150 to 200 years The concept also addresses the flammability issues that other chemists have been worried about. " For decades, scientists have been very optimistic about lithium-sulfur batteries, lithium-ion batteries than its high efficiency and low cost. But its short life span is its greatest weakness and has therefore never been commercialized. In addition, the use of liquid electrolytes in batteries has also become a scumbag to scientists. On the one hand, liquid electrolytes help to transfer lithium ions in the cell by dissolving polysulfides. Disadvantageously, however, this dissolution process causes the battery to be prematurely damaged. Now, the ORNL research team's new design approach removes these obstacles. First, they synthesized a new substance rich in sulfur and used it as the cathode of a battery that conducts lithium metal and lithium metal compounds used in the cathode of conventional batteries, which are then made up of lithium Anode and solid electrolyte (also developed by researchers at ORNL) combine to create this all-solid-state battery with high energy density. "The change of electrolyte from liquid to solid eliminates the problem of sulfur dissolution, and because the liquid electrolyte readily reacts with lithium metal, the safety of the new battery after using the solid electrolyte is even higher," said Leung Cheng-tsu, The sulfur used in the new lithium-sulfur batteries is a by-product of the petroleum after-treatment, rich in source, low in cost, and capable of storing more energy, which makes the new battery have the advantages of low cost and large energy density. " Test results show that the new battery maintains a capacitance of 1200 mAh / g after 300 charge and discharge cycles at a temperature of 60 degrees Celsius compared to an average capacitance of 140 to 170 mAh / g for a conventional lithium-ion battery. Liang Cheng-Governor said that because lithium-sulfur batteries carry half the voltage of lithium-ion batteries, the average capacitance of its 8 times, so the new battery energy density of about 4 times the traditional lithium-ion battery. Although the new batteries are still in the demonstration phase, researchers hope to get the research labs to commercial applications as soon as possible, and they are patented for the technology. comment As early as the 90s of last century, some people started to research and develop lithium-sulfur batteries. In recent years, relevant research work at home and abroad has become more active. The higher specific capacity and energy density mean that the weight and volume of lithium-sulfur batteries are lower, the discharge capacity is stronger and the cost is lower, all of which seem to fit well with the demand of the development of electric vehicles today. However, there is no doubt that there is still a long way to go in the research. For example, the number of cycles needs to be further increased, and the energy density and power density of the battery still need to be further improved to meet the needs of the electric vehicle market. Knitted Wine Set
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