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N, O co-doped chlorella-based biomass carbon modified separator for lithium-sulfur battery with high capacity and long cycle performance
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-11-26 , DOI: 10.1016/j.jcis.2020.11.084
Qian Li , Yongpeng Liu , Liwen Yang , Yang Wang , Yihua Liu , Yanxiao Chen , Xiaodong Guo , Zhenguo Wu , Benhe Zhong

As a lithium-ion secondary battery with high energy density, lithium-sulfur batteries have very bright development prospects. But the shuttle effect is still a thorny issue in the development process. The N, O co-doped chlorella-based biomass carbon (CBBC) synthesized by chemical activation method possesses a microporous and mesoporous composite structure, large specific surface area, and good electrical conductivity. The CBBC interlayer can improve the wettability between the separator and the electrolyte, and accelerate the transmission of Li+. N, O heteroatoms have a strong chemical adsorption operation for LiPs. The modified separator restrains lithium polysulfide through physical barriers and chemical adsorption, and improves the capacity and cycle performance of lithium-sulfur batteries. The batteries with CBBC exhibit excellent cycling stability (0.067% per cycle at 0.5C) and better rate performance (918 mAh g−1 at 2C). The first discharge capacity at 0.05C was 1540 mAh g−1. Even after 600 cycles the discharge capacity retains 656 mAh g−1 at 0.5C. The low price and simple preparation of CBBC interlayer is an attractive choice for improving lithium-sulfur batteries.



中文翻译:

高容量,长循环性能的N,O共掺杂小球藻生物质碳改性隔膜

锂硫电池作为一种高能量密度的锂离子二次电池,具有非常广阔的发展前景。但是穿梭效应仍然是发展过程中的棘手问题。通过化学活化法合成的N,O共掺杂的绿藻基生物质碳(CBBC)具有微孔和中孔复合结构,比表面积大,导电性好。CBBC中间层可改善隔膜与电解质之间的润湿性,并加速Li +的传输。N,O杂原子对LiP具有很强的化学吸附作用。改进的隔板通过物理屏障和化学吸附抑制多硫化锂,并提高了锂硫电池的容量和循环性能。带有CBBC的电池表现出出色的循环稳定性(在0.5C下每个循环为0.067%)和更好的倍率性能(在2C下为918mAh g -1)。在0.05℃下的首次放电容量为1540mAh g -1。即使经过600次循环,放电容量在0.5C时仍保持656 mAh g -1。CBBC中间层的低价格和简单的制备方法是改进锂硫电池的诱人选择。

更新日期:2020-12-03
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