Tremella-like nitrogen-doped microporous carbon derived from housefly larvae for efficient encapsulation of small S2–4 molecules in Li-S batteries
Tremella-like nitrogen-doped microporous carbon derived from housefly larvae for efficient encapsulation of small S2–4 molecules in Li-S batteries
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DOI：
10.1088/2053-1591/ab1bf9
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发表时间：
2019-05
影响因子：
2.3
通讯作者：
Dan Sun;Rameez Razaq;Ying Xin;Jinghao Zhang;Qian Li;Taizhong Huang;Zhaoliang Zhang
中科院分区：
文献类型：
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作者：
Dan Sun;Rameez Razaq;Ying Xin;Jinghao Zhang;Qian Li;Taizhong Huang;Zhaoliang Zhang
由于硫的电绝缘性和多硫化物Li2Sn（4≤n≤8）的溶解性，可充电锂硫电池（LSBs）的商业化受到严重限制。在此，我们展示了一种可持续和熟练的策略来合成一种独特且具有成本效益的银耳样氮掺杂微孔碳（TNMC）材料。TNMC的主要特点是它具有相互连接的三维通道和空隙，高表面积（bbb1000 m2 g−1）以及大体积（0.62 cm3 g−1）。特别是，高比例的超微孔和约0.54 nm的主要孔宽在物理上限制亚稳小硫分子（S2-4）方面发挥了重要作用。更重要的是，含有足够氮掺杂（6-8 wt%）的tnmc不仅提高了硫电极材料的导电性，而且作为化学吸附S2-4的活性位点，有效地减少了穿梭效应。得益于其独特的三维微观结构和固有的氮掺杂，合成的lbs具有高可逆容量和稳定的库仑效率。
The commercialization of rechargeable lithium-sulfur batteries (LSBs) has been severely restricted due to the electrically insulating nature of sulfur and the dissolution of polysulfides Li2Sn (4 ≤ n ≤ 8). Herein, we demonstrated a sustainable and proficient strategy to synthesize a unique and cost-effective tremella-like nitrogen-doped microporous carbon (TNMC) materials derived from housefly larvae. The key feature of TNMC is that it possesses interconnected 3D channels with voids, high surface area (>1000 m2 g−1) along with large volume (0.62 cm3 g−1). Particularly, a high portion of ultra-micropore and the predominant pore width of ∼0.54 nm play important roles in confining the metastable small sulfur molecules (S2–4) physically. More importantly, TNMCs with sufficient nitrogen doping (6–8 wt%) not only improve the conductivity of sulfur electrode materials but also act as an active site for adsorbing S2–4 chemically and reducing the shuttle effect efficiently. Beneficial from the unique 3D microstructures with ultra-micropore and inherent nitrogen doping, the resultant LSBs show high reversible capacity with a stable Coulombic efficiency.