Lithium batteries will produce dendrites during use. Breaking dendrites will not only lead to battery capacity decay and reduced service life, but also may pierce the separator and short-circuit the battery to catch fire and cause safety problems. The research team of Professor Liang Jiajie and Professor Chen Yongsheng of Nankai University and the research team of Jiangsu Normal University Lai Chao proposed a new optimization strategy to solve this problem, and successfully prepared a silver nanowire-graphene three-dimensional porous carrier with a multi-level structure and loaded with lithium metal As a composite anode material. This carrier can suppress the generation of lithium dendrites, which can achieve ultra-high-speed battery charging, and is expected to greatly extend the "life" of lithium batteries. The research results were published in the latest issue of "Advanced Materials".

In recent years, there have been many related studies in various countries around the world that have made important breakthroughs in the design and synthesis of lithium anode materials, but so far it has not been able to suppress the problems of dendrite generation and electrode volume expansion of metal lithium under high current density charge and discharge, so the long Lifetime and large capacity "fast charge and quick release" are still insurmountable.

"Depositing lithium metal into a porous current collector with a three-dimensional network structure to build a lithium metal composite anode material is one of the effective ways to solve the above difficulties." Liang Jiajie said. Based on this understanding, the research group first proposed the ideal metal lithium anode three-dimensional carrier material selection and optimization strategy to achieve ultra-high current density and ultra-long cycle life. They used the three-dimensional network of graphene macroscopic bodies as the mechanical skeleton and the two-dimensional network of silver nanowires as the conductive structure, and prepared the silver nanowires-graphite with multi-level structure through a low-cost coating-cold-drying method compatible with industrial production. A three-dimensional porous carrier of ene and supporting metal lithium as a metal lithium composite negative electrode material.

After testing, the specific capacity of the metal lithium composite anode material can reach 2573mAh / g; in the symmetrical battery test, it was realized for the first time that it was repeatedly charged and discharged at an extremely high current density of 40mAh / cm2 for more than 1000 weeks, and the overpotential was less than 120 mV . It can be seen through electron microscope observation that the multi-level three-dimensional structure carrier can successfully suppress the growth of lithium dendrites and the change in electrode volume in the metal lithium anode even under the cycling condition of extremely large current charge and discharge. (Reporter Sun Yusong correspondent Ma Chao)

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According to the shape of the handle:
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Handle pot: The handle of the pot is in a rainbow shape above the lid.
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Handle pot: The handle of the pot is like a handle, at a right angle to the body of the pot.
No handle pot: no handle, hold the head of the pot to pour tea.

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