Graphene airgel used in high volume is eligible Research Advances energy than lithium-sulfur battery

Recently, the two-dimensional material and energy devices Innovation Zone Research Group Dalian Institute of Chemical Physics, Chinese Academy of Wuzhong handsome team developed a three-dimensional graphene / carbon nanotubes porous Aerogels material, and apply elemental sulfur in the positive electrode of lithium-sulfur battery carrier and an intermediate layer are integrated to obtain a lithium-sulfur battery of high volume energy density and excellent cycle stability. Research results published in the \”Nano Energy\” (Nano Energy). 石墨烯气凝胶应用于高体积比能量锂硫电池研究获进展 DICP graphene airgel used in high volume lithium-sulfur battery is eligible Advances Research energy than lithium sulfur battery having a high theoretical energy density (2600Wh / kg) and a high volume energy density (2800Wh / L), it is considered to is a very promising high specific energy batteries. However, due to the presence of elemental sulfur of low mass density (2.07g / cm3), poor conductivity (5 × 10-30S / cm), the volume expansion of the active material and large (78.7%) during charge and discharge, the polysulfide shuttle serious problems, Although the cause of its high 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-free integration of the positive electrode current collector 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 / cm3), significantly increased the volumetric energy density of the lithium-sulfur battery (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.

相关新闻