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The research team used cavity silica microspheres to inhibit lithium dendrite growth
According to foreign media reports, the American Journal of Chemistry (ACS journal) "Nano Express" published a paper, the researchers used hollow silica microspheres structure to accommodate lithium ions, carbon nanotubes The inner core can inhibit dendrite growth. Since dendritic growth is inhibited, the electrode can maintain high-speed plating/stripping efficiency up to 99% after more than 200 charge and discharge cycles.
Lithium metal batteries (LMBs) have received great attention in the industry because of their high energy density. In lithium metal batteries, the specific capacity of lithium metal is high (3860 mA hg?1), compared to the standard hydrogen electrode, and the electrochemical potential is low (?3.04 V). Therefore, lithium is an ideal anode material.
However, uneven lithium deposition leads to dendrite growth, which reduces the battery's charge and discharge efficiency (cycling efficiency), and even a short circuit inside the battery, which causes battery failure and safety risks.
Recently, the industry has proposed various methods such as electrolyte additives, stable interfacial layers, and modified electrodes to solve the critical problems of lithium metal anodes. It has been proven that the use of architecture to adjust lithium dendrite accumulation is the most efficient way.
Although the heterogeneous structure plays an important role in regulating the deposition behavior, the fine control mechanism of lithium metal is limited by the deposition conditions such as deposition capacity and current. Current density. Therefore, if the deposition performance is too high, it is necessary to improve the heterogeneous structure, and it is necessary to guide it to make it uniform precipitation method.
The team designed a composite microcage with a carbon nanotube core and a porous silica sheath. The composite microcage structure can accommodate lithium metal and its heterogeneous structure can be used as a lithium ion trapper.
During the experiment, the research team found that lithium metal can be effectively trapped, and its electrochemical performance is excellent.