Creative & Advanced Research Based on Nanomaterials (CARBON) Laboratory, Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Kandi-502285, Sangareddy, Telangana, India; Cellulose & Composites Laboratory, Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology, Hyderabad, Kandi-502285, Sangareddy, Telangana, India.
Creative & Advanced Research Based on Nanomaterials (CARBON) Laboratory, Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Kandi-502285, Sangareddy, Telangana, India.
Carbohydr Polym. 2022 Oct 1;293:119731. doi: 10.1016/j.carbpol.2022.119731. Epub 2022 Jun 13.
This study demonstrates flexible, ultra-high rate, and long cycle life lithium‑sulfur batteries using bacterial cellulose (BC) derived cathode host as well as separator. The work also includes a new strategy to use active sulfur in the form of catholyte added directly to the electrolyte for improved sulfur utilization. The fabricated LiS cell with carbonized bacterial cellulose (CBC) as a cathode host and BC as a separator (CBC@BC) delivers an impressive capacity of 740 mAh g at 1C. It retains a capacity of 310 mAh g even at an ultra-high rate of 4C. To have commercial adoption of CBC@BC, we tested LiS cells with a high areal loading of 5 mg cm. The cell shows promising electrochemical performance for 500 cycles with a capacity retention of 82 %. Furthermore, first-principle calculations are performed to understand the interaction of soluble lithium-polysulfides with bacterial cellulose-derived material.
这项研究展示了使用细菌纤维素（BC）衍生的正极主体和隔膜的灵活、超高倍率和长循环寿命锂硫电池。该工作还包括一种新策略，即将活性硫以添加到电解质中的电解液形式直接用于正极，以提高硫的利用率。用碳化细菌纤维素（CBC）作为正极主体和 BC 作为隔膜（CBC@BC）制备的 LiS 电池在 1C 时提供了令人印象深刻的 740 mAh g 的容量。即使在超高倍率 4C 下，它仍保持 310 mAh g 的容量。为了使 CBC@BC 商业化，我们测试了具有高面载量 5 mg cm 的 LiS 电池。该电池在 500 次循环中表现出良好的电化学性能，容量保持率为 82%。此外，还进行了第一性原理计算来理解可溶性锂多硫化物与细菌纤维素衍生材料的相互作用。
