Abstract Waste PET bottles have been processed towards carbonaceous material through pyrolysis at 500 °C in nitrogen atmosphere followed by chemical activation with K2CO3. The obtained carbon was found to feature hierarchical pore structure, as evidenced by nitrogen sorption isotherm analysis. Composite sulfur-carbon electrode has been prepared using this carbon by means of simple dry-mixing technique and subjected to electrochemical testing in model Li-S cells with electrolyte being 0.5 M lithium trifluoromethanesulfonate (LiTf) and 0.5 M lithium nitrate (LiNO3) in mixture of 1,2dimethoxyethane (DME) and 1,3-dioxolane (DOL). The Li-S cells assembled with obtained composite sulfur-carbon cathode demonstrated a large initial specific discharge capacity of about 829 mA h g−1 at 0.05 C current rate and delivered ca. 712 mA h g−1 after subsequent 50 charge and discharge cycles, which corresponds to 86% capacity retention. Generally, the investigated Li-S cells have exhibited good cycling stability and excellent reversibility. Thus, the obtained waste-derived activated porous carbon can be considered as a promising component for the composite cathode material of Li–S batteries.

中文翻译：

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用于 Li-S 电池的复合硫正极，包含从废 PET 瓶中获得的分级碳

摘要 废 PET 瓶已通过在 500 °C 的氮气氛中热解，然后用 K2CO3 进行化学活化来加工成含碳材料。发现获得的碳具有分级孔结构，如氮吸附等温线分析所证明的。使用这种碳通过简单的干混技术制备复合硫碳电极，并在模型 Li-S 电池中进行电化学测试，电解质为 0.5 M 三氟甲磺酸锂 (LiTf) 和 0.5 M 硝酸锂 (LiNO3) 的混合物1,2-二甲氧基乙烷 (DME) 和 1,3-二氧戊环 (DOL)。与获得的复合硫碳阴极组装的 Li-S 电池在 0.05 C 电流速率下表现出约 829 mA hg-1 的大初始比放电容量，并在约 在随后的 50 次充放电循环后为 712 mA hg-1，相当于 86% 的容量保持率。一般来说，所研究的 Li-S 电池表现出良好的循环稳定性和出色的可逆性。因此，获得的废物衍生的活性炭可以被认为是锂硫电池复合正极材料的有前途的组分。