DICP develop a three-dimensional graphene / carbon nanotube porous airgel material

Recently, two-dimensional material and energy device innovation SAR study group Dalian Institute of Chemical Physics WuZhong handsome team developed a three-dimensional graphene / carbon nanotube airgel porous material, and applied to lithium-sulfur battery of sulfur elemental integrated carrier and the intermediate layer of the positive electrode, lithium-sulfur battery to obtain a high volumetric energy density and excellent cycle stability. Research results published in the \”Nano Energy\” (Nano Energy). Lithium-sulfur battery having a high theoretical energy density (2600Wh / kg) and a high volume energy density (2800Wh / L), is considered a very promising high specific energy battery. However, due to the presence of elemental sulfur of low mass density (2.07g / cm 3), poor conductivity (5 × 10-30 S / cm), and the active material during charging and discharging a large volume expansion (78.7%), and severe polysulfide shuttle problems, while leading to a higher mass density, but generally low volumetric energy density and poor cycle performance, which greatly limits the practical application of the lithium-sulfur battery. Thus, while improving the quality and how to volume energy density of the lithium-sulfur battery, and prolong the cycle life is one application of the lithium-sulfur battery bottleneck. The research team developed a three-dimensional graphene / carbon nanotube airgel porous material and simultaneously apply it to a lithium sulfur battery is elemental sulfur and the intermediate layer support, constructed by successful support, metal-collector integration of the cathode material. The integration of the positive electrode material having a high packing density, excellent electrical conductivity, good mechanical flexibility, not only to achieve a high volumetric loading of sulfur (1.64g / cm 3), significantly improved volume energy lithium-sulfur battery density (1615Ah / L), and effectively suppressed the effects of polysulfide shuttle. At a high current density. 2C, the battery 500 can stably cyclic ring, and little attenuation capacity, exhibits excellent cycle stability. This elemental sulfur cathode support and integrated design strategies for building the structure of the intermediate layer is a high volume energy density, long cycle life of lithium-sulfur battery providing a new way. The above-mentioned work was funded by the National Natural Science Foundation of China, national key research and development programs and the like. ​大连化物所开发出三维石墨烯/碳纳米管多孔气凝胶材料 DICP graphene airgel used in high volume is eligible Research Advances energy than lithium-sulfur battery

相关新闻