Zhen Mengmeng, Wang Juan, Wang Xin, Wang Cheng
Institute for New Energy Materials & Low-Carbon Technologies, Tianjin University of Technology, Tianjin, 300071, P. R. China.
School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Chemistry. 2018 Apr 17;24(22):5860-5867. doi: 10.1002/chem.201705515. Epub 2018 Mar 24.
Lithium-sulfur batteries (LSBs) are receiving extensive attention because of their high theoretical energy density. However, practical applications of LSBs are still hindered by their rapid capacity decay and short cycle life, especially at high rates. Herein, a highly N-doped (≈13.42 at %) hierarchical carbon sponge (HNCS) with strong chemical adsorption for lithium polysulfide is fabricated through a simple sol-gel route followed by carbonization. Upon using the HNCS as the sulfur host material in the cathode and an HNCS-coated separator, the battery delivers an excellent cycling stability with high specific capacities of 424 and 326 mA h g and low capacity fading rates of 0.033 % and 0.030 % per cycle after 1000 cycles under high rates of 5 and 10 C, respectively, which are superior to those of other reported carbonaceous materials. These impressive cycling performances indicate that such a battery could promote the practical application prospects of LSBs.
锂硫电池（LSBs）因其高理论能量密度而受到广泛关注。然而，LSBs的实际应用仍然受到其快速容量衰减和短循环寿命的阻碍，尤其是在高倍率下。在此，通过简单的溶胶 - 凝胶路线随后碳化制备了一种对多硫化锂具有强化学吸附作用的高氮掺杂（≈13.42 at %）分级碳海绵（HNCS）。将HNCS用作阴极中的硫主体材料以及HNCS涂层隔膜时，该电池在5和10 C的高倍率下经过1000次循环后，分别具有424和326 mA h g的高比容量以及0.033 %和0.030 %的低容量衰减率，展现出优异的循环稳定性，优于其他已报道的碳质材料。这些令人印象深刻的循环性能表明，这种电池可以推动LSBs的实际应用前景。
