Lithium ion Battery 18650 has New Trend
Dendrite breakage will not only lead to battery capacity decay and life discount, but also may puncture the diaphragm and cause battery short circuit ignition safety problems.
Liang Jiajie, Chen Yongsheng of Nankai University and Lai Chao of Jiangsu Normal University put forward a new optimization strategy to solve this problem. Silver nanowires with multi-stage structure, a three-dimensional porous carrier of graphene, were successfully prepared and loaded with lithium metal as composite anode materials. This carrier can inhibit the formation of lithium dendrite, thus realizing ultra-high-speed battery charging, which is expected to significantly extend the "life" of lithium batteries. The research is published in the latest issue of advanced materials.
In recent years, many countries have made important breakthroughs in the design and synthesis of lithium anode materials. However, it is still unable to restrain the dendrite formation and electrode volume expansion of lithium under high current density charging and discharging.
"Depositing lithium metal into a porous collector with three-dimensional network structure to construct lithium metal composite anode material is one of the effective ways to solve the above difficulties at present." Liang Jiajie said. Based on this understanding, the research group firstly proposed the material selection and optimization strategy for the ideal lithium anode with ultra-high current density and ultra-long cycle life. Using graphene macroscopic three-dimensional networks as mechanical skeletons and silver nanowires two-dimensional networks as conductive structures, they fabricated multistage silver nanowires-graphene three-dimensional porous carriers by a low-cost coating-drying process compatible with industrial production, and loaded lithium metal as a lithium composite negative.