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release time:2024-05-28 Hits: Popular:AG11 battery
Research on the application of graphene aerogel in Dalian Institute of Chemical Physics for high volume energy Nickel Hydride No. 5
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 Nickel Hydride No. 5. 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 NanoEnergy. Nickel Hydride No. 5 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 element (2.07g/cm3), poor conductivity (5×10-30S/cm), large volume expansion of active materials (78.7%) during charging and discharging, and severe polysulfide shuttle, 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 Nickel Hydride No. 5. Therefore, how to simultaneously improve the mass and volume energy density of Nickel Hydride No. 5 and extend their cycle life is one of the bottlenecks in current application research of Nickel Hydride No. 5. 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 Nickel Hydride No. 5, 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 Nickel Hydride No. 5 (1615Ah/ L), and effectively inhibits the effect of polysulfide shuttle.
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 intermediate layer into a cathode structure provides a new idea for building Nickel Hydride No. 5 with high volumetric energy density and long cycle life.
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