3.7v 2200mah 18650 lithium battery.Dalian's research on graphene aerogels applied to high volume ratio energy lithium-sulfur batteries has made progress

　　Recently, Wu Zhongshuai's team, a researcher at the Two-dimensional Materials and Energy Devices Innovation Zone Research Group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, developed a three-dimensional graphene/carbon nanotube porous aerogel material and applied it to the sulfur content of lithium-sulfur batteries. The single-element carrier and the intermediate layer integrate the cathode to obtain a lithium-sulfur battery with high volumetric energy density and excellent cycle stability. Relevant research results were published in Nano Energy.

　　Lithium-sulfur batteries have high-quality theoretical energy density (2600Wh/kg) and high volumetric energy density (2800Wh/L), and are considered to be a high-specific energy battery with great application prospects. However, due to the low mass density of sulfur (2.07g/cm3), poor conductivity (5×10-30S/cm), large volume expansion of active materials (78.7%) during charging and discharging, and severe polysulfide shuttling, etc. As a result, although their mass density is high, their volume energy density is generally low and their cycle performance is poor, which greatly limits the practical application of lithium-sulfur batteries. Therefore, how to simultaneously improve the mass and volume energy density of lithium-sulfur batteries and extend their cycle life is one of the bottlenecks in current application research of lithium-sulfur batteries.

　　The research team developed a three-dimensional graphene/carbon nanotube porous aerogel material and simultaneously applied it to the sulfur element carrier and intermediate layer of lithium-sulfur batteries, successfully constructing a self-supporting, metal-free integrated cathode Material. The integrated cathode material has high compaction density, excellent conductivity, and good mechanical flexibility. It not only achieves a high volume sulfur loading (1.64g/cm3), but also significantly improves the volumetric energy density of lithium-sulfur batteries (1615Ah/ L), and effectively inhibits the shuttle effect of polysulfides. Under the condition of a high current density of 2C, the battery can cycle stably for 500 cycles with almost no capacity attenuation, showing excellent cycle stability. This design strategy of integrating the sulfur element carrier and the interlayer positive electrode structure provides a new idea for building lithium-sulfur batteries with high volumetric energy density and long cycle life.

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