Carbon-based aerogel prepared via direct conversion of natural biomass has wide application prospects in the environment and energy field. Herein, the sustainable and environmentally friendly porous carbon aerogel is prepared through hydrothermal treatment, freeze-drying, and postpyrolysis using sweet potato as the precursor. The as-prepared carbon aerogel is used to modify the commercial separator of lithium–sulfur batteries to solve the problems of poor cycle life and low utilization rate of active substances. The carbon aerogel coating can not only suppress the shuttle effect of the polysulfide intermediates during cycling and reduce the cell resistance but also act as an upper current collector to increase the utilization rate of sulfur. The cell with carbon aerogel modified separator exhibits high electrochemical performance. The results show that the initial discharge capacity is 1216 mAh/g at 0.1 C and the reversible discharge capacity retains 431 mAh/g after 1000 cycles at 1 C with the Coulombic efficiency over 95.3%.

中文翻译：

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高性能锂硫电池，配有可持续发展和环保的碳气凝胶改性隔膜

通过直接转化天然生物质制备的碳基气凝胶在环境和能源领域具有广阔的应用前景。在本文中，使用甘薯作为前体通过水热处理，冷冻干燥和后热解制备可持续且环保的多孔碳气凝胶。所制备的碳气凝胶用于修饰锂硫电池的商用隔膜，以解决循环寿命低和活性物质利用率低的问题。碳气凝胶涂层不仅可以抑制循环过程中多硫化物中间体的穿梭作用并降低电池电阻，而且还可以作为上部集电器来提高硫的利用率。带有碳气凝胶修饰的隔膜的电池具有很高的电化学性能。