Liu Min, Deng Nanping, Ju Jingge, Wang Liyuan, Wang Gang, Ma Yali, Kang Weimin, Yan Jing
ACS Appl Mater Interfaces. 2019 May 15;11(19):17843-17852. doi: 10.1021/acsami.9b04122. Epub 2019 May 6.
The ever-increasing demand for electric devices and vehicles prompts the fast development of energy storage systems. Lithium metal is thought to be the most promising electrode for high-performance batteries. However, the growth of lithium dendrites impedes the industrial production of lithium metal batteries. Herein, an effective approach is proposed by coating a commercial separator with three-dimensional porous carbon fibers loaded with silver nanoparticles (Ag-PCNFs), which can be regarded as a subsidiary of the electrode to improve the cycling performance of lithium metal batteries. The porous structure with a high specific surface area endows the electrode with a high lithium-loading capacity. The silver nanoparticles provide the electrode pro-Li property and excellent electrical conductivity, which are beneficial for the electrochemical reaction and reduce the local current density to attain a dendrite-free electrode. Electrochemical cycling performance of symmetric Li-Li batteries shows that Ag-PCNF coating can hinder dendrite growth and enhance the cycling stability, indicating that Ag-PCNFs acting as host materials can effectively guide the deposition of Li and solve the dendrite problem.
对电子设备和车辆不断增长的需求推动了储能系统的快速发展。锂金属被认为是高性能电池最有前景的电极。然而，锂枝晶的生长阻碍了锂金属电池的工业化生产。在此，提出了一种有效的方法，即通过用负载银纳米颗粒的三维多孔碳纤维（Ag-PCNFs）涂覆商业隔膜，这可被视为电极的一个辅助部分，以改善锂金属电池的循环性能。具有高比表面积的多孔结构赋予电极高锂负载能力。银纳米颗粒赋予电极亲锂特性和优异的导电性，这有利于电化学反应并降低局部电流密度，从而获得无枝晶电极。对称锂-锂电池的电化学循环性能表明，Ag-PCNF涂层可以阻碍枝晶生长并提高循环稳定性，这表明Ag-PCNFs作为主体材料可以有效地引导锂的沉积并解决枝晶问题。
