"Lithium-ion batteries commonly used in the market use graphite as the negative electrode. If it is replaced with lithium metal, its capacity can be increased by a factor of 10. However, lithium metal is too lively, it is flammable in water, and dendrites can make the battery short-circuit. Hidden troubles are still far away from real applications.†On the 13th, Professor Cui Wei of the Department of Materials Science and Engineering at Stanford University in the United States stated on the 10th issue in the journal Nature Nanotechnology that scientists are always looking for high capacity. Safe battery performance electrode replacement. Recently, their research group developed a negative electrode of lithium alloy/graphene foil whose capacity is close to that of lithium metal and has excellent safety characteristics.
The paper's co-first author and Zhao Yu, a doctoral student at Stanford University, told the reporter of the Science and Technology Daily that the lithium alloy/graphene “thousand-layer cake†can be prepared by packing tightly packed lithium alloy nanoparticles in a large piece of graphene sheet. Since the lithium alloy itself is the largest volume state, and is limited to the graphene "cake" with high conductivity and good chemical stability, the volume expansion of the negative electrode of the alloy and the dendrite growth problem of the lithium metal negative electrode are avoided. The "Thousand-layer cake" can also be assembled with a high-capacity sulfur cathode to produce a highly efficient, stable, long-life battery, greatly increasing the energy density and safety performance of the battery.
The paper's co-first author, Stanford University postdoctoral Zhou Guangmin further pointed out that the lithium metal anode is very unstable in the air, and the various package strategies reported have not completely solved this problem. In this kind of “thousand-layer cake†structure, the large stacks of graphene layers tightly envelop the active lithium alloy, which plays a role of hydrophobicity and gas barrier, so that the lithium-rich negative electrode has good air stability.
Cui Wei said that with its high capacity, excellent cycle performance and safety features, the lithium alloy/graphene foil not only has application prospects in traditional lithium-ion batteries, but also is expected to be used as a replacement for lithium metal negative electrodes for the next generation of lithium. /Air, lithium/sulfur batteries. (Reporter Jiang Jing)
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